Sigma factors are initiation factors that promote the attachment of RNA polymerase to specific initiation sites and are then released. Extracytoplasmic function (ECF) sigma factors are held in an inactive form by an anti-sigma factor until released, although no anti-sigma factor is known for this protein (By similarity). Regulates the promoter of SigI, may not be autoregulated.

Belongs to the sigma-70 factor family. ECF subfamily.

312 amino acids

MEVSEFEALRQHLMSVAYRLTGTVADAEDIVQEAWLRWDSPDTVIADPRAWLTTVVSRLGLDKLRSAAHRRETYTGTWLPEPVVTGLDATDPLAAVVAAEDARFAAMVVLERLRPDQRVAFVLHDGFAVPFAEVAEVLGTSEAAARQLASRARKAVTAQPALISGDPDPAHNEVVGRLMAAMAAGDLDTVVSLLHPDVTFTGDSNGKAPTAVRAVRGSDKVVRFILGLVQRYGPGLFGANQLALVNGELGAYTAGLPGVDGYRAMAPRITAITVRDGKVCALWDIANPDKFTGSPLKERRAQPTGRGRHHRN

33.5 kDa

(Note: Representative image - actual molecular weight may vary depending on tag type and expression method)

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