What are the two groups of proteins that regulate transcriptional activity? (+2 sub groups) (4)

TRANSCRIPTION FACTORS: form a complex with RNA pol at the promoter, needed to start transcription = their levels regulate gene expression REGULATORY PROTEINS: bind to DNA sequences outside the promoter + interact w/ the transcription factors. Such as: Activator proteins: bind to enhancer sites = increases transcription rate (moderates complex formation) Repressor proteins: bind to silencer sequences = decreases transcription rate (prevents complex formation)