Electron microscopy of the Mo‐Fe‐protein from Azotobacter vinelandii nitrogenase

V. L. TSUPRUN, I. Z. MITSOVA, I. S. BLAZHCHUK, R. I. GVOZDEV, E. V. ORLOVA, N. A. KISELEV

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The quaternary structure of the Mo‐Fe‐protein from Azotobacter vinelandii has been studied by electron microscopy. A model of the molecule of the Mo‐Fe‐protein has been proposed: two α subunits are displaced relative to two β subunits along a twofold axis, so the molecule can be characterized by the point‐group pseudosymmetry 222. Computer averaging of the images showed that one of the projections of the molecule could be characterized by twofold rotational symmetry. Micrographs of nitrogenase recombined complex (Mo‐Fe‐protein + Fe‐protein) have been obtained. They showed particles close in size and form to the Mo‐Fe‐protein molecule. Therefore, it has been proposed that the Fe‐protein could be situated in the central cavity of Mo‐Fe‐protein.

Original languageEnglish (US)
Pages (from-to)389-392
Number of pages4
JournalEuropean Journal of Biochemistry
Volume149
Issue number2
DOIs
StatePublished - Jun 1985

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