Fixation of dinitrogen derived from denitrification of nitrate in a photosynthetic bacterium, Rhodopseudomonas sphaeroides forma sp. denitrificans.
AUTOR(ES)
Dunstan, R H
RESUMO
Studies with 15N demonstrated that the phototrophic bacterium Rhodopseudomonas sphaeroides forma sp. denitrificans strain IL106 cannot assimilate NO-3 but rather denitrifies it to N2. This strain also fixed N2 into cell protein, although nitrogenase activity was partially inhibited in the presence of NO-3. Strain IL106 did not assimilate NO-3, but growing cultures and washed cell suspensions incorporated the tracer from 15NO-3 via denitrification to 15N2 and then via nitrogenase into cell nitrogen. This incorporation was inhibited in cells supplied with NH4+ or in the absence of light, thus confirming the participation of nitrogenase in the assimilation of nitrogen from nitrate. This represents a novel type of N2 recycling in a photodiazotrophic denitrifying bacterium.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=220086Documentos Relacionados
- Control of nitrogenase in a photosynthetic autotrophic bacterium, Ectothiorhodospira sp.
- Molecular analysis of the poly(3-hydroxyalkanoate) synthase gene from a methylotrophic bacterium, Paracoccus denitrificans.
- Plasmid rearrangements in the photosynthetic bacterium Rhodopseudomonas sphaeroides.
- Triazine herbicide resistance in the photosynthetic bacterium Rhodopseudomonas sphaeroides
- Molybdenum requirement for translocation of dimethyl sulfoxide reductase to the periplasmic space in a photodenitrifier, Rhodobacter sphaeroides f. sp. denitrificans.
