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• W1503935521 abstract "Our understanding of the regulation of the nitrogen-fixation process in free-living diazotrophs has advanced considerably in the last decade with information coming from a wide range of model systems. These advances have led to a much more global view of the mechanisms, which facilitate the very stringent control that is necessary to maximise the physiological benefits from diazotrophy. With regard to nitrogen control, members of the PII protein family, i.e., the GlnB, GlnK, NifI, etc. proteins, clearly play a pivotal role in nearly all organisms and PII is now being recognised as the critical signal-transduction protein in a wide variety of aspects of bacterial nitrogen metabolism (Arcondéguy et al., 2001). At the molecular level, our understanding of the regulatory processes is advancing considerably in those organims that have a NifA-dependent mode of control, although the ability to purify active NifA proteins (particularly of the O2-sensitive group) is still a major hurdle. The heterocystous cyanobacteria are particularly complex owing to the integration of the regulation of both nitrogenase expression and activity with that of heterocyst development. Nevertheless, considerable information is now emerging and a broad outline of the major signal-transduction pathways may be achieved fairly soon. The groups of organisms where there is still much to be learnt are the Archaea and the Gram-positive diazotrophs. In the Archaea, the advent of genome sequences and good genetic systems in model organisms, e.g., Methanobacterium thermoautotrophicum and Methanosarcina mazei, shows considerable promise for the future but similar opportunities are not yet apparent in the Gram-positive diazotrophs. In summary, the challenge in the future is to begin to integrate our current knowledge into a whole-cell perspective of the genetic, biochemical and physiological processes that contribute to successful diazotrophy." @default.
• W1503935521 created "2016-06-24" @default.
• W1503935521 creator A5041957934 @default.
• W1503935521 date "2006-01-27" @default.
• W1503935521 modified "2023-09-26" @default.
• W1503935521 title "Regulation of Nitrogen Fixation in Free-Living Diazotrophs" @default.
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