Abstract
The presence and localization of a reversible hydrogenase in non-N2-fixing cells of the filamentous cyanobacterium Anabaena variabilis were investigated by in vitro activity measurements, native-PAGE/activity stain, SDS-PAGE/Western immunoblots, and immunogold localization. Reversible hydrogenase activity was induced approximately 100-fold by sparging the cell suspensions with a mixture of 99% argon and 1% CO2 for 20–26 h. Native-PAGE/activity stain demonstrated the presence of an in vitro functional enzyme with an apparent molecular mass of 118 kDa. Native-PAGE/Western immunoblots, using polyclonal antisera directed against purified hydrogenase from the purple sulphur bacterium Thiocapsa roseopersicina, detected two native proteins with molecular masses of 118 and 133 kDa, respectively. SDS-PAGE/Western immunoblots confirmed the presence of a single polypeptide with a molecular mass of approximately 40 kDa in both induced and non-induced cells. Immunocytolocalization experiments using ultrathin sections again demonstrated the presence of hydrogenase in both induced and non-induced cells. A higher specific labeling was associated with the thylakoid regions, which, using an image analyzer, was calculated to be approximately 4 x higher per cell area compared to in the centroplasm. It is suggested that anaerobic incubation induces higher reversible hydrogenase activity, regulated mainly at the level of activating (pre)existing form(s) of inactive enzyme(s)/protein(s), maybe in combination with synthesis of additional subunit(s).
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Serebriakova, L., Zorin, N.A. & Lindblad, P. Reversible hydrogenase in Anabaena variabilis ATCC 29413. Arch. Microbiol. 161, 140–144 (1994). https://doi.org/10.1007/BF00276474
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DOI: https://doi.org/10.1007/BF00276474