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Ribbe, Markus Walter

TitleChancellor's Professor
InstitutionUniversity of California, Irvine
DepartmentMolecular Biology & Biochemistry
Address2236 McGaugh Hall
Zot 3900
Irvine CA 92697
Phone(949) 824-9509, 4737
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    Collapse Research 
    Collapse Research Activities and Funding
    2014 Iron-Sulfur Enzymes Gordon Research Conference
    NIH/NIGMS R13GM111038May 1, 2014 - Apr 30, 2015
    Role: Principal Investigator
    2012 Iron Sulfur Enzymes Gordon Research Conference
    NIH/NIDDK R13DK096716Aug 1, 2012 - Jul 31, 2013
    Role: Principal Investigator
    Nitrogenase assembly mechanism
    NIH/NIGMS R01GM067626May 1, 2003 - Nov 30, 2020
    Role: Principal Investigator

    Collapse Bibliographic 
    Collapse Publications
    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Researchers can login to make corrections and additions, or contact us for help.
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    1. Lee CC, Ribbe MW, Hu Y. Purification of Nitrogenase Proteins. Methods Mol Biol. 2019; 1876:111-124. PMID: 30317477.
      View in: PubMed
    2. Jasniewski A, Hu Y, Ribbe MW. Electron Paramagnetic Resonance Spectroscopy of Metalloproteins. Methods Mol Biol. 2019; 1876:197-211. PMID: 30317483.
      View in: PubMed
    3. Sickerman NS, Hu Y, Ribbe MW. Nitrogenases. Methods Mol Biol. 2019; 1876:3-24. PMID: 30317471.
      View in: PubMed
    4. Lee CC, Hu Y, Ribbe MW. Reduction and Condensation of Aldehydes by the Isolated Cofactor of Nitrogenase. ACS Cent Sci. 2018 Oct 24; 4(10):1430-1435. PMID: 30410981.
      View in: PubMed
    5. Rettberg L, Tanifuji K, Jasniewski A, Ribbe MW, Hu Y. Radical S-Adenosyl-l-Methionine (SAM) Enzyme Involved in the Maturation of the Nitrogenase Cluster. Methods Enzymol. 2018; 606:341-361. PMID: 30097098.
      View in: PubMed
    6. Tanifuji K, Lee CC, Sickerman NS, Tatsumi K, Ohki Y, Hu Y, Ribbe MW. Tracing the 'ninth sulfur' of the nitrogenase cofactor via a semi-synthetic approach. Nat Chem. 2018 May; 10(5):568-572. PMID: 29662207.
      View in: PubMed
    7. Rupnik K, Lee CC, Hu Y, Ribbe MW, Hales BJ. A VTVH MCD and EPR Spectroscopic Study of the Maturation of the "Second" Nitrogenase P-Cluster. Inorg Chem. 2018 Apr 16; 57(8):4719-4725. PMID: 29611695.
      View in: PubMed
    8. Rebelein JG, Lee CC, Newcomb M, Hu Y, Ribbe MW. Characterization of an M-Cluster-Substituted Nitrogenase VFe Protein. MBio. 2018 Mar 13; 9(2). PMID: 29535200.
      View in: PubMed
    9. Lee CC, Tanifuji K, Newcomb M, Liedtke J, Hu Y, Ribbe MW. A Comparative Analysis of the CO-Reducing Activities of MoFe Proteins Containing Mo- and V-Nitrogenase Cofactors. Chembiochem. 2018 Apr 04; 19(7):649-653. PMID: 29363247.
      View in: PubMed
    10. Sickerman NS, Ribbe MW, Hu Y. Nitrogenase Cofactor Assembly: An Elemental Inventory. Acc Chem Res. 2017 Nov 21; 50(11):2834-2841. PMID: 29064664.
      View in: PubMed
    11. Sickerman NS, Hu Y, Ribbe MW. Nitrogenase Assembly: Strategies and Procedures. Methods Enzymol. 2017; 595:261-302. PMID: 28882203.
      View in: PubMed
    12. Sickerman NS, Tanifuji K, Hu Y, Ribbe MW. Synthetic Analogues of Nitrogenase Metallocofactors: Challenges and Developments. Chemistry. 2017 Sep 12; 23(51):12425-12432. PMID: 28726330.
      View in: PubMed
    13. Sickerman NS, Hu Y, Ribbe MW. Activation of CO2 by Vanadium Nitrogenase. Chem Asian J. 2017 Aug 17; 12(16):1985-1996. PMID: 28544649.
      View in: PubMed
    14. Sickerman NS, Rettberg LA, Lee CC, Hu Y, Ribbe MW. Cluster assembly in nitrogenase. Essays Biochem. 2017 05 09; 61(2):271-279. PMID: 28487403.
      View in: PubMed
    15. Sickerman NS, Tanifuji K, Lee CC, Ohki Y, Tatsumi K, Ribbe MW, Hu Y. Reduction of C1 Substrates to Hydrocarbons by the Homometallic Precursor and Synthetic Mimic of the Nitrogenase Cofactor. J Am Chem Soc. 2017 01 18; 139(2):603-606. PMID: 28043123.
      View in: PubMed
    16. Rebelein JG, Lee CC, Hu Y, Ribbe MW. The in vivo hydrocarbon formation by vanadium nitrogenase follows a secondary metabolic pathway. Nat Commun. 2016 Dec 15; 7:13641. PMID: 27976719.
      View in: PubMed
    17. Tanifuji K, Sickerman N, Lee CC, Nagasawa T, Miyazaki K, Ohki Y, Tatsumi K, Hu Y, Ribbe MW. Structure and Reactivity of an Asymmetric Synthetic Mimic of Nitrogenase Cofactor. Angew Chem Int Ed Engl. 2016 Dec 12; 55(50):15633-15636. PMID: 27862765.
      View in: PubMed
    18. Fay AW, Blank MA, Rebelein JG, Lee CC, Ribbe MW, Hedman B, Hodgson KO, Hu Y. Assembly scaffold NifEN: A structural and functional homolog of the nitrogenase catalytic component. Proc Natl Acad Sci U S A. 2016 08 23; 113(34):9504-8. PMID: 27506795; PMCID: PMC5003292 [Available on 02/23/17].
    19. Hu Y, Ribbe MW. Nitrogenases-A Tale of Carbon Atom(s). Angew Chem Int Ed Engl. 2016 Jul 11; 55(29):8216-26. PMID: 27206025.
      View in: PubMed
    20. Hu Y, Ribbe MW. Maturation of nitrogenase cofactor-the role of a class E radical SAM methyltransferase NifB. Curr Opin Chem Biol. 2016 Apr; 31:188-94. PMID: 26969410; PMCID: PMC4870152 [Available on 04/01/17].
    21. Lee CC, Sickerman NS, Hu Y, Ribbe MW. YedY: A Mononuclear Molybdenum Enzyme with a Redox-Active Ligand? Chembiochem. 2016 Mar 15; 17(6):453-5. PMID: 26751730; PMCID: PMC4922886 [Available on 03/15/17].
    22. Hu Y, Ribbe MW. Biosynthesis of the Metalloclusters of Nitrogenases. Annu Rev Biochem. 2016 Jun 02; 85:455-83. PMID: 26844394.
      View in: PubMed
    23. Lee CC, Fay AW, Weng TC, Krest CM, Hedman B, Hodgson KO, Hu Y, Ribbe MW. Uncoupling binding of substrate CO from turnover by vanadium nitrogenase. Proc Natl Acad Sci U S A. 2015 Nov 10; 112(45):13845-9. PMID: 26515097; PMCID: PMC4653198.
    24. Tanifuji K, Lee CC, Ohki Y, Tatsumi K, Hu Y, Ribbe MW. Combining a Nitrogenase Scaffold and a Synthetic Compound into an Artificial Enzyme. Angew Chem Int Ed Engl. 2015 Nov 16; 54(47):14022-5. PMID: 26473503; PMCID: PMC4715667 [Available on 11/16/16].
    25. Wiig JA, Hu Y, Ribbe MW. Refining the pathway of carbide insertion into the nitrogenase M-cluster. Nat Commun. 2015 Aug 11; 6:8034. PMID: 26259825; PMCID: PMC4535184.
    26. Rebelein JG, Hu Y, Ribbe MW. Widening the Product Profile of Carbon Dioxide Reduction by Vanadium Nitrogenase. Chembiochem. 2015 Sep 21; 16(14):1993-6. PMID: 26266490; PMCID: PMC4696554 [Available on 09/21/16].
    27. Ribbe MW. Insights into the Mechanism of Carbon Monoxide Dehydrogenase at Atomic Resolution. Angew Chem Int Ed Engl. 2015 Jul 13; 54(29):8337-9. PMID: 26031600.
      View in: PubMed
    28. Lee CC, Hu Y, Ribbe MW. Insights into hydrocarbon formation by nitrogenase cofactor homologs. MBio. 2015 Apr 14; 6(2). PMID: 25873377; PMCID: PMC4453561.
    29. Cahn JK, Brinkmann-Chen S, Spatzal T, Wiig JA, Buller AR, Einsle O, Hu Y, Ribbe MW, Arnold FH. Cofactor specificity motifs and the induced fit mechanism in class I ketol-acid reductoisomerases. Biochem J. 2015 Jun 15; 468(3):475-84. PMID: 25849365; PMCID: PMC4550535.
    30. Hu Y, Ribbe MW. Nitrogenase and homologs. J Biol Inorg Chem. 2015 Mar; 20(2):435-45. PMID: 25491285; PMCID: PMC4336585.
    31. Lee CC, Hu Y, Ribbe MW. Catalytic reduction of CN-, CO, and CO2 by nitrogenase cofactors in lanthanide-driven reactions. Angew Chem Int Ed Engl. 2015 Jan 19; 54(4):1219-22. PMID: 25420957; PMCID: PMC4300254.
    32. Rebelein JG, Hu Y, Ribbe MW. Differential reduction of CO2 by molybdenum and vanadium nitrogenases. Angew Chem Int Ed Engl. 2014 Oct 20; 53(43):11543-6. PMID: 25205285; PMCID: PMC4240507.
    33. Hu Y, Ribbe MW. A journey into the active center of nitrogenase. J Biol Inorg Chem. 2014 Aug; 19(6):731-6. PMID: 24752864; PMCID: PMC4119499.
    34. Rupnik K, Lee CC, Wiig JA, Hu Y, Ribbe MW, Hales BJ. Nonenzymatic synthesis of the P-cluster in the nitrogenase MoFe protein: evidence of the involvement of all-ferrous [Fe4S4](0) intermediates. Biochemistry. 2014 Feb 25; 53(7):1108-16. PMID: 24520862; PMCID: PMC3970913.
    35. Lee CC, Ribbe MW, Hu Y. Cleaving the n,n triple bond: the transformation of dinitrogen to ammonia by nitrogenases. Met Ions Life Sci. 2014; 14:147-76. PMID: 25416394.
      View in: PubMed
    36. Ribbe MW, Hu Y, Hodgson KO, Hedman B. Biosynthesis of nitrogenase metalloclusters. Chem Rev. 2014 Apr 23; 114(8):4063-80. PMID: 24328215; PMCID: PMC3999185.
    37. Ni F, Lee CC, Hwang CS, Hu Y, Ribbe MW, McKenna CE. Reduction of fluorinated cyclopropene by nitrogenase. J Am Chem Soc. 2013 Jul 17; 135(28):10346-52. PMID: 23834519.
      View in: PubMed
    38. Hu Y, Ribbe MW. Biosynthesis of the iron-molybdenum cofactor of nitrogenase. J Biol Chem. 2013 May 10; 288(19):13173-7. PMID: 23539617; PMCID: PMC3650356.
    39. Wiig JA, Lee CC, Hu Y, Ribbe MW. Tracing the interstitial carbide of the nitrogenase cofactor during substrate turnover. J Am Chem Soc. 2013 Apr 03; 135(13):4982-3. PMID: 23514429; PMCID: PMC3726556.
    40. Moser J, Lange C, Krausze J, Rebelein J, Schubert WD, Ribbe MW, Heinz DW, Jahn D. Structure of ADP-aluminium fluoride-stabilized protochlorophyllide oxidoreductase complex. Proc Natl Acad Sci U S A. 2013 Feb 05; 110(6):2094-8. PMID: 23341615; PMCID: PMC3568340.
    41. Lancaster KM, Hu Y, Bergmann U, Ribbe MW, DeBeer S. X-ray spectroscopic observation of an interstitial carbide in NifEN-bound FeMoco precursor. J Am Chem Soc. 2013 Jan 16; 135(2):610-2. PMID: 23276198; PMCID: PMC3555700.
    42. Hu Y, Ribbe MW. Nitrogenase assembly. Biochim Biophys Acta. 2013 Aug-Sep; 1827(8-9):1112-22. PMID: 23232096; PMCID: PMC3622157.
    43. Wiig JA, Hu Y, Chung Lee C, Ribbe MW. Radical SAM-dependent carbon insertion into the nitrogenase M-cluster. Science. 2012 Sep 28; 337(6102):1672-5. PMID: 23019652; PMCID: PMC3836454.
    44. Rupnik K, Hu Y, Lee CC, Wiig JA, Ribbe MW, Hales BJ. P+ state of nitrogenase p-cluster exhibits electronic structure of a [Fe4S4]+ cluster. J Am Chem Soc. 2012 Aug 22; 134(33):13749-54. PMID: 22839751; PMCID: PMC3442605.
    45. Lee CC, Hu Y, Ribbe MW. ATP-independent substrate reduction by nitrogenase P-cluster variant. Proc Natl Acad Sci U S A. 2012 May 01; 109(18):6922-6. PMID: 22509042; PMCID: PMC3344972.
    46. Lee CC, Hu Y, Ribbe MW. ATP-independent formation of hydrocarbons catalyzed by isolated nitrogenase cofactors. Angew Chem Int Ed Engl. 2012 Feb 20; 51(8):1947-9. PMID: 22253035; PMCID: PMC3516927.
    47. Hu Y, Ribbe MW. Biosynthesis of the metalloclusters of molybdenum nitrogenase. Microbiol Mol Biol Rev. 2011 Dec; 75(4):664-77. PMID: 22126998; PMCID: PMC3232738.
    48. Hu Y, Lee CC, Ribbe MW. Vanadium nitrogenase: a two-hit wonder? Dalton Trans. 2012 Jan 28; 41(4):1118-27. PMID: 22101422; PMCID: PMC3823560.
    49. Lancaster KM, Roemelt M, Ettenhuber P, Hu Y, Ribbe MW, Neese F, Bergmann U, DeBeer S. X-ray emission spectroscopy evidences a central carbon in the nitrogenase iron-molybdenum cofactor. Science. 2011 Nov 18; 334(6058):974-7. PMID: 22096198; PMCID: PMC3800678.
    50. Hu Y, Lee CC, Ribbe MW. Extending the carbon chain: hydrocarbon formation catalyzed by vanadium/molybdenum nitrogenases. Science. 2011 Aug 05; 333(6043):753-5. PMID: 21817053; PMCID: PMC3153399.
    51. Fay AW, Blank MA, Lee CC, Hu Y, Hodgson KO, Hedman B, Ribbe MW. Spectroscopic characterization of the isolated iron-molybdenum cofactor (FeMoco) precursor from the protein NifEN. Angew Chem Int Ed Engl. 2011 Aug 16; 50(34):7787-90. PMID: 21726031; PMCID: PMC3395727.
    52. Blank MA, Lee CC, Hu Y, Hodgson KO, Hedman B, Ribbe MW. Structural models of the [Fe4S4] clusters of homologous nitrogenase Fe proteins. Inorg Chem. 2011 Aug 01; 50(15):7123-8. PMID: 21718019; PMCID: PMC3143205.
    53. Wiig JA, Hu Y, Ribbe MW. NifEN-B complex of Azotobacter vinelandii is fully functional in nitrogenase FeMo cofactor assembly. Proc Natl Acad Sci U S A. 2011 May 24; 108(21):8623-7. PMID: 21551100; PMCID: PMC3102359.
    54. Hu Y, Ribbe MW. Biosynthesis of Nitrogenase FeMoco. Coord Chem Rev. 2011 May 01; 255(9-10):1218-1224. PMID: 21503270.
      View in: PubMed
    55. Lee CC, Hu Y, Ribbe MW. Tracing the hydrogen source of hydrocarbons formed by vanadium nitrogenase. Angew Chem Int Ed Engl. 2011 Jun 06; 50(24):5545-7. PMID: 21538750.
      View in: PubMed
    56. Rupnik K, Lee CC, Hu Y, Ribbe MW, Hales BJ. [4Fe4S]2+ clusters exhibit ground-state paramagnetism. J Am Chem Soc. 2011 May 11; 133(18):6871-3. PMID: 21488637; PMCID: PMC3088508.
    57. Kaiser JT, Hu Y, Wiig JA, Rees DC, Ribbe MW. Structure of precursor-bound NifEN: a nitrogenase FeMo cofactor maturase/insertase. Science. 2011 Jan 07; 331(6013):91-4. PMID: 21212358; PMCID: PMC3138709.
    58. Hu Y, Ribbe MW. Historic overview of nitrogenase research. Methods Mol Biol. 2011; 766:3-7. PMID: 21833857.
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    59. Lee CC, Fay AW, Wiig JA, Ribbe MW, Hu Y. Assembly of nitrogenase MoFe protein. Methods Mol Biol. 2011; 766:31-47. PMID: 21833859.
      View in: PubMed
    60. Wiig JA, Lee CC, Fay AW, Hu Y, Ribbe MW. Purification of nitrogenase proteins. Methods Mol Biol. 2011; 766:93-103. PMID: 21833863.
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    61. Fay AW, Lee CC, Wiig JA, Hu Y, Ribbe MW. Protocols for cofactor isolation of nitrogenase. Methods Mol Biol. 2011; 766:239-48. PMID: 21833872.
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    62. Rupnik K, Hu Y, Fay AW, Ribbe MW, Hales BJ. Variable-temperature, variable-field magnetic circular dichroism spectroscopic study of NifEN-bound precursor and "FeMoco". J Biol Inorg Chem. 2011 Feb; 16(2):325-32. PMID: 21038112; PMCID: PMC3032186.
    63. Fay AW, Blank MA, Lee CC, Hu Y, Hodgson KO, Hedman B, Ribbe MW. Characterization of isolated nitrogenase FeVco. J Am Chem Soc. 2010 Sep 15; 132(36):12612-8. PMID: 20718463; PMCID: PMC2940275.
    64. Lee CC, Hu Y, Ribbe MW. Vanadium nitrogenase reduces CO. Science. 2010 Aug 06; 329(5992):642. PMID: 20689010; PMCID: PMC3141295.
    65. Hu Y, Ribbe MW. Decoding the nitrogenase mechanism: the homologue approach. Acc Chem Res. 2010 Mar 16; 43(3):475-84. PMID: 20030377; PMCID: PMC2840065.
    66. Fay AW, Blank MA, Yoshizawa JM, Lee CC, Wiig JA, Hu Y, Hodgson KO, Hedman B, Ribbe MW. Formation of a homocitrate-free iron-molybdenum cluster on NifEN: implications for the role of homocitrate in nitrogenase assembly. Dalton Trans. 2010 Mar 28; 39(12):3124-30. PMID: 20221547; PMCID: PMC3027845.
    67. Hu Y, Fay AW, Lee CC, Wiig JA, Ribbe MW. Dual functions of NifEN: insights into the evolution and mechanism of nitrogenase. Dalton Trans. 2010 Mar 28; 39(12):2964-71. PMID: 20221527; PMCID: PMC3030252.
    68. Yoshizawa JM, Fay AW, Lee CC, Hu Y, Ribbe MW. Insertion of heterometals into the NifEN-associated iron-molybdenum cofactor precursor. J Biol Inorg Chem. 2010 Mar; 15(3):421-8. PMID: 19967421; PMCID: PMC2830607.
    69. Lee CC, Blank MA, Fay AW, Yoshizawa JM, Hu Y, Hodgson KO, Hedman B, Ribbe MW. Stepwise formation of P-cluster in nitrogenase MoFe protein. Proc Natl Acad Sci U S A. 2009 Nov 03; 106(44):18474-8. PMID: 19828444; PMCID: PMC2774011.
    70. Hu Y, Yoshizawa JM, Fay AW, Lee CC, Wiig JA, Ribbe MW. Catalytic activities of NifEN: implications for nitrogenase evolution and mechanism. Proc Natl Acad Sci U S A. 2009 Oct 06; 106(40):16962-6. PMID: 19805110; PMCID: PMC2761346.
    71. Schwarz G, Mendel RR, Ribbe MW. Molybdenum cofactors, enzymes and pathways. Nature. 2009 Aug 13; 460(7257):839-47. PMID: 19675644.
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    72. Yoshizawa JM, Blank MA, Fay AW, Lee CC, Wiig JA, Hu Y, Hodgson KO, Hedman B, Ribbe MW. Optimization of FeMoco maturation on NifEN. J Am Chem Soc. 2009 Jul 08; 131(26):9321-5. PMID: 19514721; PMCID: PMC2716083.
    73. Lee CC, Hu Y, Ribbe MW. Unique features of the nitrogenase VFe protein from Azotobacter vinelandii. Proc Natl Acad Sci U S A. 2009 Jun 09; 106(23):9209-14. PMID: 19478062; PMCID: PMC2695066.
    74. Cotton MS, Rupnik K, Broach RB, Hu Y, Fay AW, Ribbe MW, Hales BJ. VTVH-MCD study of the Delta nifB Delta nifZ MoFe protein from Azotobacter vinelandii. J Am Chem Soc. 2009 Apr 08; 131(13):4558-9. PMID: 19334767.
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    75. Wätzlich D, Bröcker MJ, Uliczka F, Ribbe M, Virus S, Jahn D, Moser J. Chimeric nitrogenase-like enzymes of (bacterio)chlorophyll biosynthesis. J Biol Chem. 2009 Jun 05; 284(23):15530-40. PMID: 19336405; PMCID: PMC2708849.
    76. Hu Y, Fay AW, Lee CC, Yoshizawa J, Ribbe MW. Assembly of nitrogenase MoFe protein. Biochemistry. 2008 Apr 01; 47(13):3973-81. PMID: 18314963.
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    77. Corbett MC, Hu Y, Fay AW, Tsuruta H, Ribbe MW, Hodgson KO, Hedman B. Conformational differences between Azotobacter vinelandii nitrogenase MoFe proteins as studied by small-angle X-ray scattering. Biochemistry. 2007 Jul 10; 46(27):8066-74. PMID: 17567155.
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    78. Hu Y, Fay AW, Lee CC, Ribbe MW. P-cluster maturation on nitrogenase MoFe protein. Proc Natl Acad Sci U S A. 2007 Jun 19; 104(25):10424-9. PMID: 17563349; PMCID: PMC1965529.
    79. Fay AW, Hu Y, Schmid B, Ribbe MW. Molecular insights into nitrogenase FeMoco insertion--the role of His 274 and His 451 of MoFe protein alpha subunit. J Inorg Biochem. 2007 Nov; 101(11-12):1630-41. PMID: 17521738; PMCID: PMC2935933.
    80. Hu Y, Fay AW, Ribbe MW. Molecular insights into nitrogenase FeMo cofactor insertion: the role of His 362 of the MoFe protein alpha subunit in FeMo cofactor incorporation. J Biol Inorg Chem. 2007 May; 12(4):449-60. PMID: 17203313.
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    81. Broach RB, Rupnik K, Hu Y, Fay AW, Cotton M, Ribbe MW, Hales BJ. Variable-temperature, variable-field magnetic circular dichroism spectroscopic study of the metal clusters in the DeltanifB and DeltanifH mofe proteins of nitrogenase from Azotobacter vinelandii. Biochemistry. 2006 Dec 19; 45(50):15039-48. PMID: 17154541.
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    82. Hu Y, Corbett MC, Fay AW, Webber JA, Hodgson KO, Hedman B, Ribbe MW. Nitrogenase Fe protein: A molybdate/homocitrate insertase. Proc Natl Acad Sci U S A. 2006 Nov 14; 103(46):17125-30. PMID: 17062756; PMCID: PMC1859896.
    83. Hu Y, Corbett MC, Fay AW, Webber JA, Hodgson KO, Hedman B, Ribbe MW. FeMo cofactor maturation on NifEN. Proc Natl Acad Sci U S A. 2006 Nov 14; 103(46):17119-24. PMID: 17050696; PMCID: PMC1859895.
    84. Hu Y, Fay AW, Schmid B, Makar B, Ribbe MW. Molecular insights into nitrogenase FeMoco insertion: TRP-444 of MoFe protein alpha-subunit locks FeMoco in its binding site. J Biol Chem. 2006 Oct 13; 281(41):30534-41. PMID: 16893897.
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    85. Corbett MC, Hu Y, Fay AW, Ribbe MW, Hedman B, Hodgson KO. Structural insights into a protein-bound iron-molybdenum cofactor precursor. Proc Natl Acad Sci U S A. 2006 Jan 31; 103(5):1238-43. PMID: 16423898; PMCID: PMC1360540.
    86. Hu Y, Corbett MC, Fay AW, Webber JA, Hedman B, Hodgson KO, Ribbe MW. Nitrogenase reactivity with P-cluster variants. Proc Natl Acad Sci U S A. 2005 Sep 27; 102(39):13825-30. PMID: 16166259; PMCID: PMC1236593.
    87. Hu Y, Fay AW, Ribbe MW. Identification of a nitrogenase FeMo cofactor precursor on NifEN complex. Proc Natl Acad Sci U S A. 2005 Mar 01; 102(9):3236-41. PMID: 15728375; PMCID: PMC552928.
    88. Sra AK, Hu Y, Martin GE, Snow DD, Ribbe MW, Kohen A. Competitive 15N kinetic isotope effects of nitrogenase-catalyzed dinitrogen reduction. J Am Chem Soc. 2004 Oct 13; 126(40):12768-9. PMID: 15469259.
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    89. Hu Y, Fay AW, Dos Santos PC, Naderi F, Ribbe MW. Characterization of Azotobacter vinelandii nifZ deletion strains. Indication of stepwise MoFe protein assembly. J Biol Chem. 2004 Dec 24; 279(52):54963-71. PMID: 15485884.
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    90. Corbett MC, Hu Y, Naderi F, Ribbe MW, Hedman B, Hodgson KO. Comparison of iron-molybdenum cofactor-deficient nitrogenase MoFe proteins by X-ray absorption spectroscopy: implications for P-cluster biosynthesis. J Biol Chem. 2004 Jul 02; 279(27):28276-82. PMID: 15102840.
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    91. Dos Santos PC, Dean DR, Hu Y, Ribbe MW. Formation and insertion of the nitrogenase iron-molybdenum cofactor. Chem Rev. 2004 Feb; 104(2):1159-73. PMID: 14871152.
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    92. Guo M, Sulc F, Ribbe MW, Farmer PJ, Burgess BK. Direct assessment of the reduction potential of the [4Fe-4S](1+/0) couple of the Fe protein from Azotobacter vinelandii. J Am Chem Soc. 2002 Oct 16; 124(41):12100-1. PMID: 12371842.
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    93. Ribbe MW, Hu Y, Guo M, Schmid B, Burgess BK. The FeMoco-deficient MoFe protein produced by a nifH deletion strain of Azotobacter vinelandii shows unusual P-cluster features. J Biol Chem. 2002 Jun 28; 277(26):23469-76. PMID: 11978793.
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    94. Schmid B, Ribbe MW, Einsle O, Yoshida M, Thomas LM, Dean DR, Rees DC, Burgess BK. Structure of a cofactor-deficient nitrogenase MoFe protein. Science. 2002 Apr 12; 296(5566):352-6. PMID: 11951047.
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