Metabolism of sulfur compounds by whole filaments and heterocysts of Anabaena variabilis.

AUTOR(ES)

Giddings, T H

RESUMO

Filaments of the heterocyst-forming cyanobacterium Anabaena variabilis reproduced 35SO4(2)-, incorporating 35S into cysteine, methionine, glutathione, sulfolipid, and several unidentified metabolites. The majority of the incorporated label accumulated in reduced glutathione. Heterocysts isolated from labeled filaments contained the same major labeled products. Isolated, metabolically active heterocysts were unable to reduce 35SO4(2)-, but were able to incorporate 35S2- into cysteine and glutathione. The results suggest that the initial activation of SO4(2)- occurs in vegetative cells and that some reduced forms, possibly including S20, are translocated into heterocysts.

Documentos Relacionados

• Glutamine and glutamate transport by Anabaena variabilis.
• Modifiers of heterocyst repression and spacing and formation of heterocysts without nitrogenase in the cyanobacterium Anabaena variabilis.
• Infrequent cleavage of cloned Anabaena variabilis DNA by restriction endonucleases from A. variabilis.
• Effect of nitrogenous compounds on nitrogenase gene expression in anaerobic cultures of Anabaena variabilis.
• Fructose uptake and influence on growth of and nitrogen fixation by Anabaena variabilis.