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2016

129.   R. Kositzki, S., Mebs, J. Marx, J. J. Griese, N. Schuth, M. Högbom, V. Schünemann, M. Haumann. Protonation state of MnFe and FeFe cofactors in a ligand binding oxidase revealed by X ray absorption, emission, and vibrational spectroscopy and QM/MM calculations. Inorg. Chem., DOI:10.1021/acs.inorgchem.6b01752 (2016)

128.   M. A. S. Correia, A. R. Otrelo-Cardoso, V. Schwuchow, K. G. V. Sigfridsson, M. Haumann, M. João Romão, S. Leimkühler, T. Santos-Silva. Structural basis of periplasmic aldehyde oxidation in Escherichia coli, an exceptional member of the Xanthine oxidase molybdoenzyme family, with an αβγ structure and an additional [4Fe-4S] cluster. ACS Chem. Biol., accepted (2016)

127.   I. Zaharieva, P. Chernev, G. Berggren, M. Anderlund, S. Styring, H. Dau, M. Haumann. Room-temperature energy-sampling Kß X-ray emission spectroscopy on the Mn4Ca complex of photosynthesis reveals three manganese-centered oxidation steps and suggests a coordination change prior to O2 formation. Biochemistry 55, 4197-4211 (2016)

126.   P. Schrapers, S. Mebs, S. Götzl, S. E. Hennig, H. Dau, H. Dobbek, M. Haumann. Axial ligation and redox changes at the cobalt ion in cobalamin bound to corrinoid iron-sulfur protein (CoFeSP) or in solution characterized by XAS and DFT. PLoS ONE 11(7), e0158681; DOI:10.1371/journal.pone.0158681 (2016)

125.   M. Senger, S. Mebs, J. Duan, F. Wittkamp, U.-P. Apfel, J. Heberle, M. Haumann, S. Stripp. Stepwise isotope editing of [FeFe]-hydrogenases exposes cofactor dynamics. Proc. Natl. Acad. Sci. USA, DOI: 10.1073/pnas.1606178113 (2016)

124.   T. Hartmann, P. Schrapers, T. Utesch, M. Nimtz, Y. Rippers, H. Dau, M. A. Mroginski, M. Haumann, S. Leimkühler. The molybdenum active site of formate dehydrogenase is capable to catalyze C-H bond cleavage and oxygen atom transfer reactions. Biochemistry 55, 2381-2389 (2016)

123.   Y. Kutin, V. Srinivas, M. Fritz, R. Kositzki, H. Shafaat, J. Birrell, E. Bill, M. Haumann, W. Lubitz, M. Högbom, J. J. Griese, N. Cox. Divergent assembly mechanisms of the Mn/Fe cofactors in R2lox and R2c protein. J. Inorg. Biochem.,  doi: 10.1016/j.jinorgbio.2016.04.019 (2016)

2015

122.   S. Mebs, B. Braun, R. Kositzki, C. Limberg, M. Haumann. Abrupt versus gradual spin-crossover in FeII(phen)2(NCS)2 and FeIII(dedtc)3 compared by X-ray absorption and emission spectroscopy and quantum chemical calculations. Inorg. Chem. 54, 11606-11624 (2015)

121.   J. J. Griese, R. Kositzki, P. Schrapers, R. M. M. Branca, A. Nordström, J. Lethio, M. Haumann, M. Högbom. Structural basis for oxygen activation at a heterodinuclear Mn/Fe cofactor. J. Biol. Chem. 290, 25254-25272 (2015)

120.   S. Yao, F. Meier, N. Lindenmaier, R. Rudolph, B. Blom, M. Adelhardt, J. Sutter, S. Mebs, M. Haumann, K. Meyer, M. Kaupp, M. Driess. Unprecedented biomimetic [2Fe−2S] clusters with extensively delocalized mixed-valence iron centers. Angew. Chem. Int. Ed. 54, 12506-12510 (2015)

119.   J. Noth, R. Kositzki, K. Klein, M. Winkler, M. Haumann, T. Happe. Lyophilization protects [FeFe]-hydrogenases against O2-induced H-cluster degradation. Nat. Sci. Rep. 5, 13978 (2015)

118.   P. Schrapers, S. Mebs, Y. Ilina, D. S. Warner, C. Wörmann, N. Schuth, R. Kositzki, H. Dau, C. Limberg, H. Dobbek, M. Haumann. The binuclear nickel center in the A-cluster of acetyl-CoA synthase (ACS) and two biomimetic dinickel complexes studied by X-ray absorption and emission spectroscopy. J. Phys. Conf. Ser. 712, 1-012029 (2015)

117.   N. Schuth, S. Mebs, H. Gehring, B. Horn, P. Holze, R. Kositzki, P. Schrapers, C. Limberg, M. Haumann. Biomimetic mono- and dinuclear Ni(I) and Ni(II) complexes studied by X-ray absorption and emission spectroscopy and quantum chemical calculations. J. Phys. Conf. Ser. 712, 1-012134 (2015)

116.   D. Huwald, P. Schrapers, R. Kositzki, M. Haumann, A. Hemschemeier. Characterization of unusual truncated  hemoglobins of Chlamydomonas reinhardtii suggests specialized functions. Planta 242, 167-185 (2015)

115.   P. Schrapers, T. Hartmann, R. Kositzki, H. Dau, S. Reschke, S. Leimkühler, M. Haumann. Sulfido and cysteine ligation changes at the molybdenum cofactor during substrate conversion by formate dehydrogenase (FDH) from Rhodobacter capsulatus. Inorg. Chem. 54, 3260-3271 (2015)

114.   R. Matheu, L. Francàs, P. Chernev, Z. Ertem, J. Benet-Buchholz, V. Batista, M. Haumann, X, Sala, A. Llobet. Behavior of the Ru-bda water oxidation catalyst covalently anchored on glassy carbon electrodes. ACS Catal. 5, 3422–3429 (2015)

2014

113.   A. Klauss, M. Haumann, H. Dau. Seven steps of alternating electron and proton transfer in photosystem II water oxidation traced by time-resolved photothermal beam deflection at improved sensitivity. J. Phys. Chem. B, 119, 2677-2689 (2014)

112.   P. Chernev, C. Lambertz, K. Sigfridsson, N. Leidel, R. Kositzki, C. Hsieh, R. Schiwon, S. Yao, C. Limberg, M. Driess, T. Happe, M. Haumann. Hydride binding to the active site of [FeFe]-hydrogenase. Inorg. Chem. 53, 12164-12177 (2014)

111.   J. S. McDowall, B. J. Murphy, M. Haumann, T. Palmer, F. A. Armstrong, F. Sargent. The bacterial formate hydrogenlyase complex. Proc. Natl. Acad. Sci. USA 111, E3948-3956 (2014)

110.   K. Sigfridsson, N. Leidel, O. Sanganas, P. Chernev, O. Lenz, K.-S. Yoon, H. Nishihara, A. Parkin, F. A. Armstrong, S. Dementin, M. Rousset, A. L. De Lacey, M. Haumann. Structural differences of oxidized iron-sulfur and nickel-iron cofactors in O2-tolerant and O2-sensitive hydrogenases studied by X-ray absorption spectroscopy. Biochim. Biophys. Acta 1847, 162-170 (2014)

109.   M. Haumann. Hydrogenases studied by X-ray spectroscopy. In: Biohydrogen (M. Rögner, ed.), De Gruyter, Berlin, ISBN: 978-3-11-033674-0, pp. 97-116 (2014)

108.   C. Lambertz, P. Chernev, K. Klingan, N. Leidel, K. Sigfridsson, T. Happe, M. Haumann. Electronic and molecular structures of the active-site H-cluster in [FeFe]-hydrogenase determined by site-selective X-ray spectroscopy and quantum chemical calculations. Chem. Sci. 5, 1187-1203 (2014)

2013

107.   J. P. Falkenhagen, C. Limberg, S. Horn, M. Haumann, B. Braun, S. Mebs.Iron-molybdenum-oxo complexes as initiators for olefin autoxidation with O2. Dalton Trans. 43, 806-816 (2013)

106.   S. Reschke, D. Niks, H. Wilson, K. G. V. Sigfridsson, M. Haumann, K. V. Rajagopalan, R. Hille, S. Leimkühler. Effect of exchange of the cysteine molybdenum ligand by selenocysteine on structure and function of the active site in human sulfite oxidase. Biochemistry 52, 8295-8303 (2013)

105.   P. Chernev, I. Zaharieva, H. Dau, M. Haumann, Coordination changes of carboxyl ligands at the QAFeQB triad in photosynthetic reaction centers studied by density-function theory. In: Photosynthesis Research for Food, Fuel and Future (Kuang, T., Lu, C., and Zhang, L., Eds.), pp 95-101, Springer, Heidelberg (2013)

104.   S. Reschke, K. G. V. Sigfridsson, P. Kaufmann, N. Leidel, S. Horn, C. Schulzke, M. Haumann, S. Leimkühler. Identification of a bis-molybdopterin intermediate in molybdenum cofactor biosynthesis. J. Biol. Chem. 288, 29736-29745 (2013)

103.   N. Leidel, C.-H. Hsieh, P. Chernev, K. G. V.  Sigfridsson, M. Y. Darensbourg, M. Haumann, Bridging-hydride influence on the electronic structure of an [FeFe] hydrogenase active-site model complex revealed by XAES-DFT. Dalton Trans. 42, 7539-7554 (2013)

102.   K. G. V. Sigfridsson, N. Leidel, P. Chernev, A. Popovic-Bijelic, A. Gräslund, M. Haumann, Rapid X-ray photoreduction of dimetal-oxygen cofactors in ribonucleotide reductase. J. Biol. Chem. 288, 9648-9661 (2013)

2012

101.   A. Klauss, M. Haumann, H. Dau, Alternating proton and electron transfer in photosynthetic water oxidation. Proc. Natl. Acad. Sci. USA 109, 16035-16040 (2012)

100.   N. Leidel, P. Chernev, K. Havelius, L. Schwartz, S. Ott, M. Haumann, The electronic structure of an [FeFe] hydrogenase model complex in solution revealed by X-ray absorption spectroscopy using narrow-band emission detection. J. Am. Chem. Soc. 134, 14142-14157 (2012)

99.   L. Vigara, M. Z. Ertem, N. Planas, F. Bozoglian, N. Leidel, H. Dau, M. Haumann, L. Gagliardi, C. J. Cramer, A. Llobet, Experimental and quantum chemical characterization of the water oxidation cycle catalyzed by [RuII(damp)(bpy)(H2O)]2+. Chem. Sci. 50, 11134-11142 (2012)

98.   N. Leidel, P. Chernev, K. Havelius, S. Ezzaher, S. Ott, M. Haumann, Site-selective X-ray spectroscopy on an asymmetric model complex of the [FeFe] hydrogenase active site. Inorg. Chem. 51, 4546-4559 (2012)

97.   N. Leidel, A. Popovic-Bijelic, K. Havelius, P. Chernev, N. Voevodskaya, A. Gräslund, M. Haumann, High-valence [MnFe] and [FeFe] sites in ribonucleotide reductases. Biochim. Biophys. Acta 1817, 430-444 (2012)

96.   H. Dau, I. Zaharieva, M. Haumann, Recent developments in research on water oxidation by photosystem II. Curr. Opin. Chem. Biol. 16, 1-8 (2012)

2011

95.   C. Lambertz, N. Leidel, K. Havelius, P. Chernev, J. Noth, M. Winkler, T. Happe, M. Haumann, O2 reactions at the six-iron active site (H-cluster) of [FeFe]-hydrogenase. J. Biol. Chem. 286, 40614-40623 (2011)

94.   N. Planas,  L. Vigara, C. Cady, P. Miro, P. Huang, L. Hammarström, S. Styring, N. Leidel, H. Dau, M. Haumann, L. Gagliardi, C. J. Cramer, A. Llobet, Electronic structure of oxidized complexes derived from cis-[RuII(bpy)2(H2O)2]2+ and its photoisomerization mechanism. Inorg. Chem. 50, 11134-11142 (2011)

93.   P. P. Samuel, A. Döring, S. Horn, K. Havelius, S. Reschke, L. Leimkühler, M. Haumann, C. Schulzke, A crystallographic and Mo K-edge XAS study of molybdenum-oxo bis-, mono-, and non-dithiolene complexes: first-sphere coordination and non-innocence of ligands. Eur. J. Inorg. Chem. 28, 4387–4399 (2011)

92.   J. Fritsch, S. Löscher, O. Sanganas, E. Siebert, I. Zebger, M. Ludwig, M. Stein, A. De Lacey, H. Dau, B. Friedrich, O. Lenz, M. Haumann, NiFe and FeS cofactors in membrane-bound hydrogenase from Ralstonia eutropha investigated by X-ray spectroscopy: insights into O2-tolerant H2-cleavage. Biochemistry 50, 5858-5869 (2011)

91.   I. Zaharieva, M. M. Najafpour, M. Wiechert, M. Haumann, P. Kurtz, H. Dau, Synthetic calcium-manganese oxides mimic the water-oxidizing complex of photosynthesis structurally and functionally. Energy Environ. Sci. 4, 2400-2408 (2011)

90.   I. Czech, S. Stripp, O. Sanganas, N. Leidel, T. Happe, M. Haumann, The FeFe hydrogenase maturation protein HydF contains a H-cluster like [4Fe4S]-2Fe site. FEBS lett. 585, 225-230 (2011)

89.   H. Dau, I. Zaharieva, M. Haumann, L. Gerencser,  A. Klauss, B. Suess, M. Risch, Photosynthetic water oxidation: from biophysics to solar fuels. Eur. Biophys. J. 40, 175-176 (2011)

88. K. G. V. Havelius, S. Reschke, S. Horn, A. Döring, D. Nicks, R. Hille, C. Schulzke, S. Leimkühler, M. Haumann, The molybdenum cofactor in YedY, a sulfite oxidase homologue from E. coli . Inorg. Chem. 50, 741-748 (2011)

87.   P. Chernev, I. Zaharieva, H. Dau, M. Haumann, Carboxylate shifts steer inter-quinone electron transfer in photosynthesis. J. Biol. Chem. 286, 5368-5374 (2011)

2010-1992

86.   L. Lauterbach,  J. Liu, M. Horch, P. Hummel, C. Teutloff, M. Saggu, R. Bittl, A. Schwarze, M. Haumann, K. Vincent, O. Lenz, I. Zebger, The hydrogenase subcomplex of the NAD+-reducing [NiFe]-hydrogenase from Ralstonia eutropha: Insight into redox intermediates, function, and oxygen tolerance. Eur. J. Inorg. Biochem. 7, 1067-1079 (2010)

85.   S. Löscher, A. Gebler, M. Stein, O. Sanganas, T. Buhrke, I. Zebger, H. Dau, B. Friedrich, O. Lenz, M. Haumann, Protein complex formation affects the Ni-Fe and Fe-S centers of H2-sensing  regulatory hydrogenase from Ralstonia eutropha H16. ChemPhysChem 11, 1297-1306 (2010)

84.   H. Dau, I. Zaharieva, M. Haumann, J. Wichmann, A. Grundmeier, A. Klauss, L. Gerencser, On the role of protons and O2 partial pressure in water oxidation by photosystem II. FEBS J. 277, 10-11 (2010)

83.    S. Stripp, G. Goldet, C. Brandmayr, O. Sanganas, K. Vincent, M. Haumann, F. Armstrong, T. Happe. How oxygen attacks [FeFe] hydrogenases from photosynthetic organisms. Proc. Natl. Acad. Sci. USA 106, 17331-17336 (2009)

82.   S. Dementin, F. Leroux, L. Cournac, A. De Lacey, A. Volbeda, C. Leger, B. Burlat, N. Martinez, S. Champ, L. Martin, O. Sanganas, M. Haumann, V. Fernandez, B. Guigliarelli, J. Fontecilla-Camps, M. Rousset. Introduction of methionines in the gas channel makes [NiFe] hydrogenase aero-tolerant. J. Am. Chem. Soc. 131, 10156-10164 (2009)

81.   S. Stripp, O. Sanganas, T. Happe, M. Haumann, The structure of the active site H-cluster of [FeFe] hydrogenase from the green alga Chlamydomonas reinhardtii studied by X-ray absorption spectroscopy. Biochemistry 48, 5042-5049 (2009)

80.   A. Klauss, R. Krivanek, H. Dau, M. Haumann, Energetics and kinetics of photosynthetic water oxidation studied by photothermal beam deflection (PBD) experiments. Photosynth. Res. 102, 499-509 (2009)

79.   N. Voevodskaya, F. Lendzian, O. Sanganas, A. Grundmeier, A. Gräslund, M. Haumann, Characterization of redox intermediates of the O2-activating Mn-Fe site in R2 protein of Chlamydia trachomatis ribonucleotide reductase by X-ray absorption spectroscopy and EPR. J. Biol. Chem. 284, 4555-4566 (2009)

78.   O. Sanganas, S. Löscher, S. Pfirrmann, N. Marinos, P. Glatzel, T.-C. Weng, C. Limberg, M. Driess, H. Dau, M. Haumann, Resonant inelastic X-ray scattering on synthetic nickel compounds and Ni-Fe hydrogenase protein. J. Phys. Conf. Ser. 190, 012199 (2009)

77.   I. Zaharieva, P. Chernev, M. Risch, L. Gerencser, G. Berggren, M. Anderlund, P. Glatzel, M. Haumann, H. Dau, Towards a comprehensive X-ray approach for studying the photosynthetic manganese complex—XANES, Kalpha/ Kß/ Kßsatellite emission lines, RIXS, and comparative computational approaches for selected model complexes. J. Phys. Conf. Ser. 190, 012142 (2009)

76.   M. Haumann, Photosynthetic production of oxygen at elevated oxygen gas pressure. ESRF Spotlight, http://www.esrf.eu/news/spotlight/spotlight76 (2009)

75.   M. Haumann, A. Grundmeier, I. Zaharieva, H. Dau, Photosynthetic water oxidation at elevated dioxygen partial pressure monitored by time-resolved X-ray absorption measurements. Proc. Natl. Acad. Sci. USA 105, 17384-17389 (2008)

74.   H. Dau, M. Haumann, The manganese complex of photosystem II in its reaction cycle – basic framework and possible realization at the atomic level. Coord. Chem. Rev. 252, 273-295 (2008)

73.   H. Dau, A. Grundmeier, P. Loja, M. Haumann, On the structure of the manganese complex of photosystem II – Extended-range EXAFS data and specific atomic-resolution models for four S-states. Phil. Trans. R. Soc. Lond. B 363, 1237-1244 (2008)

72.   R. Krivanek, H. Dau, M. Haumann, Enthalpy changes in photosynthetic O2 formation determined by time-resolved calorimetry using a photothermal beam deflection technique. Biophys. J. 94, 1890-1903 (2008)

71.   A. Grundmeier, P. Loja, M. Haumann, H. Dau, The manganese complex of photosystem II: Extended-range EXAFS data and specific structural models for four S-states. Proc.14th Internat. Conference on Photosynthesis, Glasgow, Allen, J. et al. Eds., Springer, pp. 405-408 (2008)

70.   H. Dau, M. Haumann, Eight Steps preceding O-O bond formation in oxygenic photosynthesis – A basic reaction cycle of the photosystem II manganese complex. Proc.14th Internat. Conference on Photosynthesis, Glasgow, Allen, J. et al. Eds., Springer, pp. 393-396 (2008)

69.   M. Haumann, H. Dau, The manganese complex of photosystem II in its reaction cycle. Proc. 6th Fall Conf. on Metallobiolomics, A. Kyriakopolous, Ed., H. Utz Verlag, München (2008)

68.    S. Löscher, L. Schwartz, M. Stein, S. Ott, M. Haumann, Facilitated hydride binding in an Fe-Fe hydrogenase active-site biomimic revealed by X-ray absorption spectroscopy and DFT calculations. Inorg. Chem. 46, 11094-11105 (2007)

67.   R. Krivanek, J. Kern, A. Zouni, H. Dau, M. Haumann, Spare quinones in the QB cavity of photosystem II from Thermosynechococcus elongatus. Biochim. Biophys. Acta 1767, 520-527 (2007)

66.   H. Dau, M. Haumann, Eight steps preceding O–O bond formation in oxygenic photosynthesis—A basic reaction cycle of the photosystem II manganese complex. Biochim. Biophys. Acta 1767, 472-483 (2007)

65.   H. Dau, M. Haumann, Time-resolved X-ray spectroscopy leads to an extension of the classical S-state cycle of photosynthetic oxygen evolution. Photosynth. Res. 92, 327-343 (2007)

64.   M. Haumann, H. Dau, Photosynthetic dioxygen formation tracked by time-resolved X-ray spectroscopy. Proc. 13th Internatl. Conf. on X-ray Absorption Fine Structure (XAFS13), B. Hedman, P. Pianetta, Eds., AIP Conf. Proc. 882, pp. 301-305 (2007)

63.   H. Dau, M. Haumann, P. Liebisch, M. Barra, P. Loja, S. Löscher, O. Kirilenko, M. Mertin, F. Schäfers, M. Anderlund, S. Ott, A. Magnusson. Towards biomimetic hydrogen production from water- Synthetic models of biological small-molecule catalysis investigated by X-ray absorption spectroscopy. Proc. 5th Fall Conf. on Metallobiolomics, A. Kyriakopolous, Ed., H. Utz Verlag, München, pp. 7-14 (2007)

62.   S. Hermes, O. Bremm, F. Garczarek, P. Liebisch, V. Derrien, P. Loja, P. Sebban, K. Gerwert, M. Haumann, A time-resolved iron specific X–ray absorption experiment yields no evidence for a Fe2+-Fe3+ transition during QA–QB electron transfer in the photosynthetic reaction center. Biochemistry 45, 353-359 (2006)

61.   M. Grabolle, M. Haumann, P. Liebisch, C. Müller, H. Dau, Rapid loss of structural motifs in the manganese complex of oxygenic photosynthesis by X-ray irradiation at 10-300 K. J. Biol. Chem. 281, 4580-4588 (2006)

60.   A. Magnuson, P. Liebisch, J. Högblom, M. Anderlund, R. Lomoth, W. Meyer-Klaucke, M. Haumann, H. Dau, Bridging-type changes facilitate successive oxidation steps at about 1 V in two binuclear manganese complexes – implications for photosynthetic water oxidation. J. Inorg. Biochem. 100, 1234-1243 (2006)

59.   H. Dau, M. Haumann, Photosynthetic oxygen production. Science 312, 1471-1472 (2006)

58.   S. Löscher, T. Burgdorf, I. Zebger, P. Hildebrandt, H. Dau, B. Friedrich, M. Haumann, Bias from H2-cleavage to –production and coordination changes at the Ni-Fe site in NAD+-reducing hydrogenase from Ralstonia eutropha. Biochemistry 45, 11658-11665 (2006)

57.   M. Haumann, M. Barra, P. Loja, S. Löscher, R. Krivanek, L.-E. Andreasson, H. Dau, Bromide does not bind to the Mn4Ca complex in its S1-state of Cl-depleted and Br-reconstituted photosystem II: evidence from X-ray absorption spectroscopy at the Br K-edge. Biochemistry 45, 13101-13107 (2006)

56.   M. Barra, M. Haumann, R. Krivanek, P. Loja, A. Grundmeier, H. Dau, Intermediates in assembly by photoactivation after stepwise disassembly of the manganese complex of photosynthetic water oxidation. Biochemistry 45, 14523-14532 (2006)

55.   R. Krivanek, H. Dau, M. Haumann, Photothermal spectroscopy to investigate the energetics of photosynthetic water oxidation. In: Metalloproteins and Metalloidproteins, pp. 18-22, H. Utz Verlag, München (2006)

54.   H. Dau, M. Haumann, P. Liebisch, C. Müller, M. Grabolle, M. Barra, P. Loja, O. Kirilenko, Photosynthetic O2-formation at the tetra-manganese complex of photosystem II tracked by novel X-ray experiments. In: Metalloproteins and Metalloidproteins, pp. 62-65, H. Utz Verlag, München (2006)

53.   M. Haumann, C. Müller, P. Liebisch, M. Barra, M. Grabolle, H. Dau, Photosynthetic O2 formation tracked by time-resolved X-ray experiments. Science 310, 1019-1021 (2005)

52.   M. Haumann, C. Müller, P. Liebisch, T. Neisius, H. Dau, A novel BioXAS technique with microsecond time resolution to track oxidation state and structural changes at biological metal centers – S-state transitions of the manganese complex of oxygenic photosynthesis. J. Synchrotron Radiat. 12, 35-44 (2005)

51.   T. Burgdorf, S. Löscher, P. Liebisch, E. van der Linden, M. Galander, F. Lendzian, S. P. Albracht, W. Meyer-Klaucke, B. Friedrich, H. Dau, M. Haumann, Structural and oxidation state changes at its non-standard Ni-Fe site during activation of the NAD-reducing hydrogenase from Ralstonia eutropha detected by X-ray absorption, EPR, and FTIR spectroscopy. J. Am. Chem. Soc. 127, 576-592 (2005)

50.   S. Löscher, I. Zebger, L. K. Andersen, P. Hildebrandt, W. Meyer-Klaucke, M. Haumann, The structure of the Ni-Fe site in the isolated HoxC subunit of the hydrogen sensor from Ralstonia eutropha. FEBS lett. 579, 4287-4291 (2005)

49.   M. Haumann, C. Müller, P. Liebisch, L. Iuzzolino, J. Dittmer, M. Grabolle, T. Neisius, W. Meyer-Klaucke, H. Dau, Structural and oxidation state changes of the photosystem II manganese complex in four transitions of the water oxidation cycle (S0->S1, S1->S2, S2->S3, S3,4->S0) characterized by X-ray absorption spectroscopy at 20 K as well as at room temperature. Biochemistry 44, 1894-1908 (2005)

48.   M. Barra, M. Haumann, H. Dau, Specific loss of the 18 KDa protein from photosystem II upon heating to 47 °C causes inactivation of oxygen evolution likely due to Ca release from the Mn complex. Photosynth. Res. 84, 213-237 (2005)

47.   H. Dau, M. Haumann, Considerations on the mechanism of photosynthetic water oxidation –dual role of oxo-bridges between Mn ions in (i) redox-potential maintenance and (ii) proton abstraction from substrate water. Photosynth. Res. 84, 325-331 (2005)

46.   T. Buhrke, S. Löscher, E. Schlodder, I. Zebger, L. K. Andersen, P. Hildebrandt, W. Meyer-Klaucke, H. Dau, B. Friedrich, M. Haumann, Reduction of unusual iron-sulfur clusters in the H2-sensing regulatory Ni-Fe hydrogenase from Ralstonia eutropha. J. Biol. Chem. 280, 19488-19495 (2005)

45.   J. Clausen. W. Junge, H. Dau, M. Haumann, Intermediates in photosynthetic water oxidation at high O2-backpressure detected by chlorophyll delayed fluorescence. Biochemistry 44, 12775-12779 (2005)

44.   C. Müller, P. Liebisch, M. Barra, H. Dau, M. Haumann , The location of calcium in the manganese complex of oxygenic photosynthesis studied by X-ray absorption spectroscopy. Physica Scripta T115, 847-850 (2005)

43.   H. Dau, P. Liebisch, M. Haumann, The manganese complex of oxygenic photosynthesis: Conversion of five-coordinated Mn(III) to six-coordinated Mn(IV) in the S2-S3 transition is implied by XANES simulations. Physica Scripta T115, 844-846 (2005)

42.   P. Liebisch, M. Haumann, H. Dau, Simulations of XANES spectra for protein-bound metal centers: Analysis of linear dichroism data. Physica Scripta T115, 859-861 (2005)

41.   S. Löscher, T. Burgdorf, T. Buhrke, B. Friedrich, H. Dau, M. Haumann, Unusual structures of the Ni-Fe cofactor in the regulatory and in the NAD-reducing hydrogenase from Ralstonia eutropha. Biochem. Soc. Trans. 33, 25-27 (2005)

40.   M. Haumann, C. Müller, P. Liebisch, P. Loja, M. Grabolle, H. Dau, Photosynthetic dioxygen formation tracked by X-ray experiments with microsecond resolution. ESRF Highlights, High Resolution and Resonance Scattering, 19-20 (2005)

39.   U. Christmann, H. Dau, M. Haumann, E. Kiss, P. Liebisch, D. Rehder, G. Santoni, C. Schulzke, Substrate binding to vanadate-dependent bromnoperoxidase from Ascophyllum nodosum: a vanadium K-edge XAS approach. Dalton Trans. 16, 2534-2540 (2004)

38.   H. Dau, P. Liebisch, M. Haumann, The structure of the manganese complex of photosystem II in its dark-stable S1-state: EXAFS results in relation to recent crystallographic data, Phys. Chem. Chem. Phys. 6, 4781-4792 (2004)

37.   C. Müller, H. Dau, M. Haumann, Chelex-treatment to obtain highly active PSII membrane particles with minimal Ca-content for XAS at the Ca K-edge. In: Photosynthesis: Fundamental Aspects and Global Perspectives. Van Est, A. & Bruce, D., Eds., Int. Soc. Photosynthesis, pp. 257-259 (2004)

36.   H. Dau, P. Liebisch, M. Haumann, Structural and oxidation state changes of the Mn4Ca complex of Photosystem II in its S-state cycle  -  X-ray absorption results and possible mechanistic implications. In: Photosynthesis: Fundamental Aspects and Global Perspectives. Van Est, A. & Bruce, D., Eds., Int. Soc. Photosynthesis, pp. 347-350 (2004)

35.   M. Haumann, Metallkofaktoren im katalytischen Funktionszyklus von Bioenzymen: Wasserstoffsynthese am Nickel-Eisen Zentrum von Hydrogenasen und Sauerstoffproduktion am Mangankomplex der oxygenen Photosynthese. In: Kyriakopoulos, A. und Behne, D. Metalloproteine und Metalloidproteine, Wissenschaftliche Verlagsgesellschaft Stuttgart, pp. 26-30 (2004)

34.   P. Pospisil, M. Haumann, J. Dittmer, A. Sole, H. Dau, Stepwise transition of the tetra-manganese complex of photosystem II to a binuclear Mn2(µ-O)2 complex in response to a temperature jump – a structural investigation employing X-ray absorption spectroscopy. Biophys. J. 84, 1370-1386 (2003)

33.   H. Dau, P. Liebisch, M. Haumann, X-ray absorption spectroscopy to analyze nuclear geometry and electronic structure of biological metal centers – Potential and questions examined with special focus on the tetranuclear manganese complex of oxygenic photosynthesis. Anal. Bioanal. Chem. 376, 562-583 (2003)

32.   M. Haumann, A. Porthun, T. Buhrke, P. Liebisch, W. Meyer-Klaucke, B. Friedrich, H. Dau, Hydrogen-induced structural changes at the nickel site of the regulatory [NiFe] hydrogenase from Ralstonia eutropha studied by X-ray absorption spectroscopy. Biochemistry 42, 11004-11015 (2003)

31.   H. Dau, M. Haumann, X-ray absorption spectroscopy to watch catalysis by metalloenzymes – Status and perspectives discussed for the water-splitting manganese complex of photosynthesis. J. Synchrotron Radiat. 10, 76-85 (2003)

30.   M. Haumann, M. Grabolle, T. Neisius, H. Dau, The first room-temperature X-ray absorption spectra of higher oxidation states of the tetra-manganese complex of photosystem II. FEBS lett. 512, 116-120 (2002)

29.   W. Junge, M. Haumann, R. Ahlbrink, A. Mulkidjanian, J. Clausen , Electrostatics and proton transfer in photosynthetic water oxidation. Phil. Trans. R. Soc. Lond. B 357, 1407-1418 (2002)

28.   M. Haumann, P. Pospisil, M. Grabolle, C. Müller, P. Liebisch, A. Sole, T. Neisius, J. Dittmer, L. Iuzzolino, H. Dau, First steps towards time-resolved BioXAS at room temperature: State transitions of the manganese complex of oxygenic photosynthesis. J. Synchrotron Radiat. 9, 304-308 (2002)

27.   M. Krüer, M. Haumann, W. Meyer-Klaucke, R. Thauer, H. Dau, Methanol:coenzyme M methyltransferase from Methanosarcina barkeri: The role of zinc in the methylation of the coenzyme M thiol group – new insights from X-ray absorption spectroscopy. Eur. J. Biochem. 269, 2117-2123 (2002)

26.   C. Meinke, A. Sole, T. Neisius, P. Pospisil, M. Haumann, H. Dau, BioXAS at room temperature. ESRF Highlights (2002)

25.   M. Haumann, M. Grabolle, M. Werthammer, L. Iuzzolino, J. Dittmer, W. Meyer- Klaucke, T. Neisius, H. Dau, The manganese complex of photosystem II: A structural model for the S1, S2, and S3 oxidation states derived from linear dichroism EXAFS spectroscopy at 20 K and at room temperature. In: PS2001 Proceedings, CSIRO Publ., Collingwood, Australia, S10-013, pp. 1-5 (2001)

24.   P. Pospisil, M. Haumann, J. Dittmer, A. Sole, H. Dau, Stepwise transition of the tetra manganese complex of Photosystem II to a binuclear Mn2(µ-O)2 complex in response to a temperature jump. In: PS2001 Proceedings, CSIRO Publ., Collingwood, Australia, S13-007, pp 1-5 (2001)

23.   M. Haumann, W. Junge, Photosynthetic water oxidation: A simplex-scheme of its partial reactions. Biochim.Biophys.Acta 1411, 86-91 (1999)

22.   M. Haumann, W. Junge, Evidence for impaired hydrogen-bonding of tyrosine YZ in Ca2+-depleted photosystem II. Biochim. Biophys. Acta 1411, 121-133 (1999)

21.   R. Ahlbrink, M. Haumann, D. Cherepanov, O. Bögershausen, A. Mulkidjanian, W. Junge, Function of tyrosine-Z in water oxidation by photosystem II: Electrostatical promoter instead of hydrogen abstractor. Biochemistry 37, 1131-1142 (1998)

20.   M. Haumann, A. Mulkidjanian, W. Junge, Tyrosine-Z in oxygen evolving photosystem II: a hydrogen-bonded tyrosinate. Biochemistry 38, 1258-1267 (1998)

19.   M. Haumann, R. Ahlbrink, W. Junge, Hydrogen-bonding of tyrosine-Z in photosystem II: Probably absent without calcium and without manganese at acid pH but strong in oxygen-evolving centers. In: Garab, G. Photosynthesis: Mechanisms and Effects. 2, 1391-1394. Dordrecht, Kluwer Academic Publishers (1998)

18.   M. Haumann, M. Hundelt, P. Jahns, S. Chroni, O. Bögershausen, D. Ghanotakis, W. Junge, Proton release from water oxidation by photosystem II: Similar stoichiometries are stabilized in thylakoids and core particles by glycerol. FEBS Lett. 410, 243-248 (1997)

17.   M. Haumann, A. Mulkidjanian, W. Junge, The electrogenicities of electron and proton transfer at the oxidizing side of photosystem II. Biochemistry 36, 9304-9315 (1997)

16.   M. Haumann, O. Bögershausen, D. Cherepanov, R. Ahlbrink, W. Junge, Photosynthetic oxygen evolution: H/D isotope effects and the coupling between electron and proton transfer during the redox reactions at the oxidizing side of photosystem II. Photosynth. Res. 51, 193-208 (1997)

15.   M. Hundelt, M. Haumann, W. Junge, Cofactor X of photosynthetic water oxidation: Electron transfer, proton release, and electrogenic behaviour in chloride-depleted photosystem II. Biochim. Biophys. Acta 1321, 47-60 (1997)

14.   O. Bögershausen, M. Haumann, W. Junge, Photosynthetic oxygen evolution: H/D isotope effects and the coupling between electron and proton transfer during transitions S2->S3 and S3->S4->S0. Ber. Bunsenges. Phys. Chem. 100, 1987-1992 (1996)

13.   M. Haumann, W. Junge, Protons and charge indicators in oxygen evolution. In: Ort, D.; Yocum, C.F., eds. Oxygenic Photosynthesis – The Light Reactions pp. 165-192, Dordrecht: Kluwer Academic Publishers (1996)

12.   M. Haumann, W. Drevenstedt, M. Hundelt, W. Junge, Photosystem II of green plants: Oxidation and deprotonation of the same component (Histidine?) on S1*-S2* in chloride depleted centers as on S2->S3 in controls. Biochim. Biophys. Acta 1273, 237-250 (1996)

11.   A. Mulkidjanian, D. Cherepanov, M. Haumann, W. Junge, Photosystem II of green plants: Topology of core pigments and redox cofactors as inferred from electrochromic difference spectra. Biochemistry 35, 3093-3107 (1996)

10.   D. Cherepanov, M. Haumann, W. Junge, A. Mulkidjanian, Topology of chromophores and cofactors in PSII as derived from the local electrochromic bandshifts. In: Mathis, P., ed. Photosynthesis: from Light to Biosphere, Kluwer Academic Publishers, Dordrecht, pp. 531-534 (1995)

9.   M. Haumann, M. Hundelt, W. Drevenstedt, W. Junge, Electrogenicity of electron and proton transfer in photosystem II of green plants. In: Mathis, P., ed. Photosynthesis: from Light to Biosphere, Kluwer Academic Publishers, Dordrecht, pp. 333-336 (1995)

8.   E. Kouimtzoglou, M. Mishra, M. Haumann, W. Junge, D. Ghanotakis, Effects of mild trypsinization on the properties of a (17, 23 and 33 kDa)-retaining PSII core complex. In: Mathis, P., ed. Photosynthesis: from Light to Biosphere, Kluwer Academic Publishers, Dordrecht, pp. 305-308 (1995)

7.   M. Haumann, W. Junge, The rates of proton uptake and electron transfer at the reducing side of photosystem II in thylakoids. FEBS lett. 347, 45-50 (1994)

6.   M. Haumann, W. Junge, Extent and rate of proton release by photosynthetic water oxidation in thylakoids: electrostatic relaxation versus chemical production. Biochemistry 33, 864-872 (1994)

5.   M. Haumann, O. Bögershausen, W. Drevenstedt, W. Junge, Organization of the water oxidase: Implications from electron transfer, electrochromism, and proton release. EBEC short reports, Vol. VIII, Elsevier, Amsterdam, p. 69 (1994)

4.   M. Haumann, O. Bögershausen, W. Junge, Photosynthetic oxygen evolution: Net charge transients as inferred from electrochromic bandshifts are independent of proton release into the medium. FEBS lett. 355, 101-105 (1994)

3.   W. Drevenstedt, M. Haumann, O. Bögershausen, W. Junge, The effect of chloride depletion on the electron transfer of photosynthetic water oxidation. Biol. Chem. Hoppe Seyler 376, 19 (1994)

2.   K. Lübbers, M. Haumann, W. Junge, Photosynthetic water oxidation under flashing light. Oxygen release, proton release and absorption transients in the near UV – a comparison between thylakoids and a reaction-center core preparation. Biochim. Biophys. Acta 1183, 210-214 (1993)

1.   P. Jahns, M. Haumann, O. Bögershausen, W. Junge, Water oxidation: 1:1:1:1 proton-over-electron stoichiometry in CAB-protein depleted thylakoids and PSII core particles. In: Murata, N., ed., Proc. IX Congr. Photosynthesis, pp. 333-336, Kluwer Academic Publishers, Dordrecht (1992)