The protein encoded by the YAF2 gene interacts with YY1, a zinc finger protein involved in negative regulation ofmuscle-restricted genes. This gene product itself contains a single N-terminal C2-X10-C2 zinc finger, and in contrastto YY1, is up-regulated during myogenic differentiation. It also facilitates proteolytic cleavage of YY1 by thecalcium- activated protease, m-calpain, suggesting a mechanism by which this protein antagonizes the negative effectof YY1. (provided by RefSeq)