Biomaterial Database

Solubilization of the iron molybdenum cofactor of Azotobacter vinelandii nitrogenase in dimethylformamide and acetonitrile. 1986

S M Lough, and D L Jacobs, and D M Lyons, and G D Watt, and J W McDonald

The iron molybdenum cofactor of Azotobacter vinelandii nitrogenase has been solubilized for the first time in dimethylformamide and acetonitrile. These solutions have the ability to reconstitute the inactive nitrogenase of the UW 45 mutant of A. vinelandii and exhibit an S = 3/2 EPR signal similar to that for the cofactor in N-methylformamide. Our ability to obtain solutions of FeMoco in these solvents seemingly refutes a previous hypothesis concerning the necessity of solvents with a dissociable proton for iron molybdenum cofactor solubility and should facilitate the spectroscopic characterization of this important species.

UI	MeSH Term	Description	Entries
D008983	Molybdoferredoxin	A non-heme iron-sulfur protein isolated from Clostridium pasteurianum and other bacteria. It is a component of NITROGENASE, which is active in nitrogen fixation, and consists of two subunits with molecular weights of 59.5 kDa and 50.7 kDa, respectively.	Molybdenum-Iron Protein,FeMo Cofactor,Iron-Molybdenum Cofactor,MoFe Protein,Iron Molybdenum Cofactor,Molybdenum Iron Protein
D009591	Nitrogenase	An enzyme system that catalyzes the fixing of nitrogen in soil bacteria and blue-green algae (CYANOBACTERIA). EC 1.18.6.1.	Dinitrogenase,Vanadium Nitrogenase,Nitrogenase, Vanadium
D011489	Protein Denaturation	Disruption of the non-covalent bonds and/or disulfide bonds responsible for maintaining the three-dimensional shape and activity of the native protein.	Denaturation, Protein,Denaturations, Protein,Protein Denaturations
D004126	Dimethylformamide	A formamide in which the amino hydrogens are replaced by methyl groups.	N,N-Dimethylformamide,N,N Dimethylformamide
D004578	Electron Spin Resonance Spectroscopy	A technique applicable to the wide variety of substances which exhibit paramagnetism because of the magnetic moments of unpaired electrons. The spectra are useful for detection and identification, for determination of electron structure, for study of interactions between molecules, and for measurement of nuclear spins and moments. (From McGraw-Hill Encyclopedia of Science and Technology, 7th edition) Electron nuclear double resonance (ENDOR) spectroscopy is a variant of the technique which can give enhanced resolution. Electron spin resonance analysis can now be used in vivo, including imaging applications such as MAGNETIC RESONANCE IMAGING.	ENDOR,Electron Nuclear Double Resonance,Electron Paramagnetic Resonance,Paramagnetic Resonance,Electron Spin Resonance,Paramagnetic Resonance, Electron,Resonance, Electron Paramagnetic,Resonance, Electron Spin,Resonance, Paramagnetic
D005288	Ferredoxins	Iron-containing proteins that transfer electrons, usually at a low potential, to flavoproteins; the iron is not present as in heme. (McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed)	Ferredoxin,Ferredoxin I,Ferredoxin II,Ferredoxin III
D000097	Acetonitriles	Compounds in which a methyl group is attached to the cyano moiety.	Cyanomethane,Cyanomethanes,Ethane Nitriles,Methyl Cyanide,Methyl Cyanides,Cyanide, Methyl,Cyanides, Methyl,Nitriles, Ethane
D001395	Azotobacter	A genus of gram-negative, aerobic bacteria found in soil and water. Its organisms occur singly, in pairs or irregular clumps, and sometimes in chains of varying lengths.
D012995	Solubility	The ability of a substance to be dissolved, i.e. to form a solution with another substance. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)	Solubilities