Final answer:
A corepressor protein is a regulatory protein required by enzymes and involved in gene regulation. It binds to DNA to silence gene expression.
Step-by-step explanation:
A corepressor protein is a regulatory protein that is required by several enzymes and is a component of regulatory proteins involved in gene expression. It plays a role in gene regulation by binding to a specific DNA sequence and helping to silence gene expression. Corepressor proteins can interact with other regulatory proteins, such as transcription factors, to modulate gene expression.