Purification and properties of nitrogenase from the cyanobacterium, Anabaena cylindrica - PubMed (original) (raw)
Comparative Study
Purification and properties of nitrogenase from the cyanobacterium, Anabaena cylindrica
P C Hallenbeck et al. Eur J Biochem. 1979 Jul.
Free article
Abstract
The nitrogenase complex was isolated from nitrogen-starved cultures of Anabaema cylindrica. Sodium dithionite, photochemically reduced ferredoxin, and NADPH were found to be effective election donors to nitro genase in crude extracts whereas hydrogen and pyruvate were not. The Km for acetylene in vivo is ten-fold higher than the Km in vitro, whereas this pattern does not hold for the non-heterocystous cyanobacterium, Plectonema boryanum. This indicates that at least one mechanism of oxygen protection in vivo involves a gas diffusion barrier presented by the heterocyst cell wall. The Mo-Fe component was purified to homogeneity. Its molecular weight (220,000), subunit composition, isoelectric point (4.8), Mo, Fe, and S2- content (2, 20 and 20 mol/mol component), and amino acid composition indicate that this component has similar properties to Mo-Fe-containing components isolated from other bacterial sources. The isolated components from A. cylindrica were found to cross-react, to varying degrees, with components isolated from Azotobacter vinelandii, Rhodospirillum rubrum, and P. boryanum.
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