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. 1983 Apr;154(1):351–355. doi: 10.1128/jb.154.1.351-355.1983

Adenine nucleotide levels in and nitrogen fixation by the cyanobacterium Anabaena sp. strain 7120.

L S Privalle, R H Burris
PMCID: PMC217466  PMID: 6403506

Abstract

Adenine nucleotide levels were determined in whole filaments of Anabaena sp. 7120 grown under different N2-fixing or non-N2-fixing conditions. These were compared with levels in isolated heterocysts, Rhodospirillum rubrum, and Azotobacter vinelandii. Adenine nucleotides in whole filaments of Anabaena sp. do not reflect the energetic expense of N2 fixation as they do in R. rubrum and A. vinelandii. However, adenine nucleotide levels in heterocysts were similar to the levels found in N2-fixing R. rubrum, i.e., an ATP:ADP ratio near 1 and an energy charge between 0.5 and 0.7. Nitrogenase activity was only 50% of optimal in permeabilized heterocysts at an exogenous ATP:ADP ratio of 3.33. Hydrogen, which increases acetylene reduction activity, also causes a transient increase (2 to 5 min) in the ATP:ADP ratio. Hydrogen has little effect on energy charge.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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