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10.3390/biom5031245

http://scihub22266oqcxt.onion/10.3390/biom5031245
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C4598750!4598750!26131973
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suck abstract from ncbi


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pmid26131973      Biomolecules 2015 ; 5 (3): 1245-65
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  • Bacterial Sigma Factors and Anti-Sigma Factors: Structure, Function and Distribution #MMPMID26131973
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  • Biomolecules 2015[Sep]; 5 (3): 1245-65 PMID26131973show ga
  • Sigma factors are multi-domain subunits of bacterial RNA polymerase (RNAP) that play critical roles in transcription initiation, including the recognition and opening of promoters as well as the initial steps in RNA synthesis. This review focuses on the structure and function of the major sigma-70 class that includes the housekeeping sigma factor (Group 1) that directs the bulk of transcription during active growth, and structurally-related alternative sigma factors (Groups 2?4) that control a wide variety of adaptive responses such as morphological development and the management of stress. A recurring theme in sigma factor control is their sequestration by anti-sigma factors that occlude their RNAP-binding determinants. Sigma factors are then released through a wide variety of mechanisms, often involving branched signal transduction pathways that allow the integration of distinct signals. Three major strategies for sigma release are discussed: regulated proteolysis, partner-switching, and direct sensing by the anti-sigma factor.
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