Mycoplasma genitalia produces only one of these and Streptococcus coelicolour makes 63, but in E. coli there are eight different kinds.  
Mycoplasma genitalia produces only one of these and Streptococcus coelicolour makes 63, but in E. coli there are eight different kinds.  Type 32 is involved in responses to heat shock and unfolded cytoplasmic proteins while type 54 is linked to metabolism of nitrogen sources other than ammonia.  The most famous of these proteins is type 70, which is involved in transcription of housekeeping genes and is required for normal growth.  Type 70 binds sequences at 10 and 35 bases upstream of the start of transcription site to help form a closed complex.  FTP, name this bacterial factor that assists promoter recognition during initiation of transcription by destabilizing nonspecific binding of RNA polymerase to DNA.
Mycoplasma genitalia produces only one of these and Streptococcus coelicolour makes 63, but in E. coli there are eight different kinds.  
sigma (s) factor