Boron Protection for O2 Diffusion in Heterocysts of Anabaena sp. PCC 7119 1
AUTOR(ES)
Garcia-González, Mercedes
RESUMO
The effect of boron on nitrogenase activity has been studied. When cells were dependent on N2 fixation, the lack of boron inhibited nitrogenase activity. However, under anaerobic conditions or in the presence of Na-dithionite this effect was not observed. Nitrogenase synthesis was not affected by boron deficiency. Similarly, the heterocyst number was not altered. Examination of boron-deficient cultures showed, however, some dramatic changes in heterocyst morphology. The increased activity of those enzymes related to the maintaining of the low intracellular level of toxic oxygen species (superoxide dismutase, catalase, and peroxidase) support our hypothesis of the role of boron in heterocyst envelope stabilization.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1054839Documentos Relacionados
- H2, N2, and O2 metabolism by isolated heterocysts from Anabaena sp. strain CA.
- A third genetic locus required for the formation of heterocysts in Anabaena sp. strain PCC 7120.
- The NtcA-Dependent P1 Promoter Is Utilized for glnA Expression in N2-Fixing Heterocysts of Anabaena sp. Strain PCC 7120
- Vectors for determining the differential expression of genes in heterocysts and vegetative cells of Anabaena sp. strain PCC 7120.
- Effects of the Alkaloid Gramine on the Light-Harvesting, Energy Transfer, and Growth of Anabaena sp. (PCC 7119).