determination of the dna sequence of a mutant in which the product of trfb is rendered defective for transcriptional repression reveals an amino acid alteration within a region of this polypeptide which exhibits homology to the alpha helix-turn-alpha helix motif characteristic of many dna binding proteins , and which is probably responsible for recognition of the trfb operator by this protein .
C0012940
dna binding proteins
C0033684
protein