Zinc finger protein

A zinc finger protein is a DNA-binding protein domain comprised of zinc fingers ranging from two in the Drosophila regulator ADR1, the more common three in mammalian Sp1 up to nine in TFIIIA. They occur in nature as the part of transcription factors conferring DNA sequence specificity as the DNA-binding domain.
See more at Wikipedia.org...

A DNA-binding domain of a protein that has a characteristic pattern of cysteine and histidine residues that complex with zinc ions. This motif occurs in several types of eukaryotic transcription factors.