期刊文献+

N_2和H^+在固氮酶活性中心金属原子簇中还原位点的分析 被引量:1

原文传递
导出
摘要 目前研究表明,固氮酶的生理底物氮气(N_2)和质子(H^+)在钼铁蛋白中的铁钼辅因子(FeMo-co)上被还原,但其确切的还原位点尚未确定.对比分析了棕色固氮菌(Azotobactervinelandii,Av)野生型(WT)与5种突变株(包括FeMo-co附近2个保守氨基酸α-191^(Gln)和α-195^(His)单突变菌株(Qα191K和Hα195Q)、FeMo-co上钼原子相连的高柠檬酸突变株(nifV^-)以及α-191^(Gln)和α-195^(His)与高柠檬酸的双突变菌株(Qα191K/nifV?和Hα195Q/nifV^-))固氮酶催化还原N_2和H^+活性的变化,结果表明,N_2在靠近FeMo-co中心硫原子(S2B)的Fe2和Fe6上络合和还原,FeMo-co上的钼原子是H^+还原的位点.结合生物信息学分析结果显示,[8Fe7S]和FeMo-co之间可能存在两条平行的电子传递通路.
出处 《科学通报》 EI CAS CSCD 北大核心 2007年第10期1141-1146,共6页 Chinese Science Bulletin
基金 国家重点基础研究发展计划资助项目(批准号:001CB108904)
  • 相关文献

参考文献43

  • 1Burris R H. Nitrogenases. J Biol Chem, 1991, 266(15): 9339—9342
  • 2Burgess B K, Lowe D J. Mechanism of molybdenum nitrogenase. Chem Rev, 1996, 96(7): 2983—3011
  • 3Howard J B, Davis R, Moldenhauer B, et al. Fe:S cluster ligands are the only cysteines required for nitrogenase Fe-protein activities. J Biol Chem, 1989, 264(19): 11270—11274
  • 4Georgiadis M M, Komiya H, Chakrabarti P, et al. Crystallographic structure of the nitrogenase iron protein from Azotobacter vinelandii. Science, 1992, 257(5077): 1653—1659
  • 5Kim J, Rees D C. Structural models for the metal centers in the nitrogenase molybdenum-iron protein. Science, 1992, 257(5077): 1677—1682
  • 6Kim J, Rees D C. Crystallographic structure and functional implications of the nitrogenase molybdenum-iron protein from Azotobacter vinelandii. Nature, 1992, 360: 553—560
  • 7Dean D R, Bolin J T, Zheng L. Nitrogenase metalloclusters: Structures, organization, and synthesis. J Bacteriol, 1993, 175(21): 6737—6744
  • 8Mayer S M, Lawson D M, Gorma C A, et al. New insights into structure-function relationships in nitrogenase: A 1.6 A resolution X-ray crystallo-graphic study of Klebsiella pneumoniae MoFe- protein. J Mol Biol, 1999, 292(4): 871—891
  • 9Yang T C, Laryukhin M, Lee H I, et al. The interstitial atom of the nitrogenase FeMo-cofactor: ENDOR and ESEEM evidence that is not a nitro-gen. J Am Chem Soc, 2005, 127(37): 12804—12805
  • 10Einsle O, Tezcan F A, Andrade S L, et al. Nitrogenase MoFe- protein at 1.16 ? resolution: A central ligand in the FeMo-cofactor. Science, 2002, 297(5587): 1696—1700

二级参考文献37

  • 1张振水,吴柏和,李季伦.固氮酶催化的放H2反应[J].微生物学报,1993,33(5):320-330. 被引量:9
  • 2黄静伟,陈灿和,张凤章,林种玉,张鸿图,万惠霖.N_2键合在固氮酶M簇笼内的一个可能证据[J].高等学校化学学报,1996,17(5):760-763. 被引量:1
  • 3Liang J H,Proc Natl Acad Sci USA,1988年,85卷,9446页
  • 4李季伦,Biochemistry,1983年,22卷,4472页
  • 5Li J L, Burris R H. Influence of pN2 and pD2 on HD formation by various nitrogenases. Biochemistry, 1983, 22(19): 4472~4480.
  • 6Rees D C, Howard J B. Nitrogenase: Standing at the crossroads.Curr Opin Chem Biol, 2000, 4(5): 559~566
  • 7Seefeldt L C, Dance I G, Dean D R. Substrate interactions with nitrogenase: Fe versus Mo. Biochemistry, 2004, 43(6): 1401~1409
  • 8Miller V L, Mekalanos J J. A novel suicide vector and its use in construction of insertion mutations: osmoregulation of outer membrane proteins and virulence determinants in Vibrio cholerae requires toxR. J Bacteriol, 1988, 170(6): 2575~2583.
  • 9Filler W A, Kemp R M, Ng J C, et al. The nifH gene product is required for the synthesis or stability of the iron-molybdenum cofactor of nitrogenase from Klebsiella pneumoniae. Eur J Biochem,1986, 160(2): 371~377
  • 10Turner G L, Gibson A H. Measurement of nitrogen fixation by indirect means. In: Gergerson F J, ed. Methods for Evaluating Biological Nitrogen Fixation.New York: John Wiley & Sons, 1980.112~125,

共引文献9

同被引文献7

引证文献1

二级引证文献4

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部