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. 1978 Apr;61(4):688–691. doi: 10.1104/pp.61.4.688

Localization of an Uptake Hydrogenase in Anabaena 1

Richard B Peterson 1, C Peter Wolk 1
PMCID: PMC1091945  PMID: 16660364

Abstract

Occurrence and localization of an uptake hydrogenase were examined in three strains of the blue-green alga, Anabaena. In vivo H2 uptake was detected (0.60-1.44 μmoles/[mg of chlorophyll a per hour]) in all three strains when grown with N2 as the sole source of nitrogen. H2 uptake (in vivo and in vitro) was severely suppressed in cultures grown on NH4+ and lacking heterocysts. H2 uptake in cell-free extracts could be readily measured with a methyl viologen-ferricyanide electron acceptor system. Solubilization kinetics during cavitation of aerobically grown Anabaena 7120 indicates that the uptake hydrogenase is localized solely in the heterocyst. When the same organism is grown on N2/CO2, vegetative cells may account for up to 21% of the total hydrogenase activity in the filaments. The results are discussed in terms of a proposed functional relationship between nitrogenase and hydrogenase.

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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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