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Sigma Factor

Known as: Subunit, Sigma, Sigma Subunit, Initiation Factor, Sigma 
A protein which is a subunit of RNA polymerase. It effects initiation of specific RNA chains from DNA.
National Institutes of Health

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AdpA-dependent sigma factor, Streptomyces griseusAlgU protein, Pseudomonas aeruginosaBldN protein, Streptomyces coelicolorCrtS protein, Streptomyces setonii
In BloodProcess of secretionagonistsantagonists & inhibitors

Papers overview

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1997
1997
Roles of RpoS (σS), IHF and ppGpp in the expression of the hmp gene encoding the flavohemoglobin (Hmp) of Escherichia coli K-12
Abstract The Escherichia coli K-12 gene hmp encodes the flavohemoglobin Hmp. A hmp promoter Φ(hmp-lacZ)-operon fusion was… 
1987
1987
Studies of the functional topography of Escherichia coli RNA polymerase. Affinity labelling of RNA polymerase in a promoter complex by phosphorylating derivatives of primer oligonucleotides.
Amidation of the 5'-phosphate group of the heptanucleotide pdApdApdApdTpdCpdGprC and of its derivatives of the general formula… 
1986
1986
The sigma subunit of RNA polymerase contacts the leading ends of transcripts 9-13 bases long on the lambda PR promoter but not on T7 A1.
The sigma subunit of RNA polymerase is responsible for specific initiation of RNA synthesis at promoter sites on DNA. sigma… 
1983
1983
Chemical modifications of the sigma subunit of the E. coli RNA polymerase.
The function of arginine, cysteine and carboxylic amino acid (glutamic and aspartic) residues of sigma was studied using chemical… 
1981
1981
Early steps in the path of nascent ribonucleic acid across the surface of ribonucleic acid polymerase, determined by photoaffinity labeling.
The photoaffinity probes beta-(4-azidophenyl) adenosine 5'-diphosphate (N3PhppA) and beta-(4-azidophenyl) adenylyl-(3'--5… 
1980
1980
Physicochemical properties and interactions of Escherichia coli ribonucleic acid polymerase holoenzyme, core enzyme, subunits, and subassembly alpha 2 beta.
We have investigated several physicochemical properties of Escherichia coli DNA-dependent RNa polymerase, its constituent… 
1979
1979
Spectroscopic analysis of the interaction of Escherichia coli DNA-dependent RNA polymerase with T7 DNA and synthetic polynucleotides.
We have studied the circular dichroism and ultraviolet difference spectra of T7 bacteriophage DNA and various synthetic… 
1977
1977
A gene from Escherichia coli affecting the sigma subunit of RNA polymerase.
The RNA polymerase sigma subunits of Escherichia coli K, E. coli C, and Salmonella typhimurium can be resolved by electrophoresis… 
1976
1976
Spatial relationship of the sigma subunit and the rifampicin binding site in RNA polymerase of Escherichia coli.
sigma subunit of Escherichia coli RNA polymerase is known to stimulate specific RNA chain initiation. Rifampicin, an inhibitor of… 
1975
1975
Sigma cycle during in vitro transcription: demonstration by nanosecond fluorescence depolarization spectroscopy.
Studies of RNA chain initiation have suggested that the sigma subunit of Escherichia coli RNA polymerase (RNA…