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MATERIALS AND METHODS
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DNase I footprint analyses indicated that R. A cosmid carrying the R. DNase I footprint analyses, using R. Expression from promoter insertion mutants showed that the function of the promoter distal regulatory region was helical phase-dependent. These results indicated that RegA exerts its regulatory affect on cbb I expression through direct interaction with the cbb I promoter.
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A pilot field experiment to assess the relationship between traditional biogeochemical rate measurements and transcriptional activity of microbial populations was carried out at the LEO 15 site off Tuckerton, N. Similar diel patterns of carbon fixation and rbcL gene expression were observed in three of four time series, with maxima for photosynthetic capacity P max and rbcL mRNA occurring between 10 a. The lowest P max and rbcL levels were detected between 6 p. Clone libraries from reverse transcription-PCR-amplified rbcL mRNA indicated the presence of several chromophytic algae diatoms, prymnesiophytes, and chrysophytes and some eukaryotic green flagellates. Analogous results were obtained from amplified small rRNA sequences and secondary pigment analysis. These results suggest that diatoms were a major contributor to carbon fixation at LEO 15 at the time of sampling and that photosynthetic carbon fixation was partially controlled by transcriptional regulation of the RubisCO gene. A primary research goal for marine environmental biogeochemistry is a thorough understanding of the molecular to global scale links and feedback mechanisms between solar irradiance, marine microbial activity, primary productivity, carbon and nitrogen cycles, and remotely sensed ocean color data. Increased emphasis is now being placed on the application of modern molecular tools to address these problems. Understanding of the genetic basis of biogeochemical processes and, more importantly, the expression of relevant genes in the marine environment is perceived as a promising route to these goals. A detailed understanding of the connection between gene expression, protein translation, and enzyme activity in environmental systems can provide significant insight into the mechanisms controlling biogeochemical transformation rates.
View research View latest news Sign up for updates. Carbon dioxide serves as the preferred electron acceptor during photoheterotrophic growth of nonsulfur purple photosynthetic bacteria such as Rhodobacter capsulatus and Rhodobacter sphaeroides. This CO 2 , produced as a result of the oxidation of preferred organic carbon sources, is reduced through reactions of the Calvin-Benson-Bassham reductive pentose phosphate pathway. This pathway is thus crucial to maintain a balanced intracellular oxidation-reduction potential or redox poise under photoheterotrophic growth conditions. In the absence of a functional Calvin-Benson-Bassham pathway, either an exogenous electron acceptor, such as dimethylsulfoxide, must be supplied or the organism must somehow develop alternative electron acceptor pathways to preserve the intracellular redox state of the cell. Spontaneous variants of Rba. In contrast to previous studies with other organisms, the dinitrogenase reductase polypeptides were maintained in an active and unmodified form in strain SBP-PHC and the respective RCN d strains. Unlike the situation in Rba.
