Sigma (s) subunit is present in:
RNA POLYMERASE DNA dependent RNA polymerase Complex holoenzyme with five polypeptides units Five polypeptides - 2 alpha , 1b , 1b' , one sigma Sigma subunit enables the core enzyme to recognize and bind the promoter region to form the preinitiation complex (PIC). b-Main catalytic activity b' binds to DNA template
80 S subunit
RNA polymerase
Required for initiation of replication
DNA polymerase
DNB 2018