Hydrogen metabolism and the alternative nitrogenase in the cyanbacterium Anabaena variabilis
The alternative nitrogenase was demonstrated in Azo-tobacter (1) and also occurs in Anabaena variabilis. This cyanobacterium can be grown in dependence on V in the medium under N2-fixing conditions(2). The cyanobacterial V-nitrogenase reduces C2H2 with lower rates than the Mo-enzyme, forms partly C2H6 and produces more H2 than the Azotobacter V-nitrogenase(3). This communication reports some new data on the expression of nitrogenases in A. variabilis.
KeywordsNitrogen Fixation Fresh Medium Nitrate Reductase Control Culture Reductase Activity
- (3).Eady, R. R. et al. (1988) in Nitrogen Fixation: Hundred Years After, eds. Bothe, H., De Bruijn F.J.& Newton, W.E. (Fischer, Stuttgart), pp.81–86Google Scholar