A Common Amino Acid Motif Found in Many of the Polypeptides

Question

A common amino acid motif found in many of the polypeptides that function as repressors is
A) Leucine zipper motif.
B) Zinc finger motif.
C) Helix-turn-helix motif.
D) Helix-loop-helix motif.
E) Alpha-beta-alpha motif.

Accepted Answer

The helix-turn-helix motif is a common amino acid motif found in many of the polypeptides that function as repressors. This motif consists of two alpha helices connected by a short turn, with the second helix containing amino acid residues that interact with the DNA to repress transcription.