NCIt definition : A C4HC3 zinc-finger-like motif, the PHD finger is found in nuclear proteins thought
involved in chromatin-mediated transcriptional regulation. Single or multiple fingers
are found. A specific function is not yet known, but it could be involved in protein-protein
interactions important for assembly/activity of multi-component transcriptional regulatory
complexes. In CBP it is an integral part of the acetyltransferase enzymatic core domain
and contributes to CBP transcriptional activity. PHD fingers fold into an interleaved
Zn-finger chelating two Zn ions in an atypical cross-braced conformation also shared
by the FYVE and RING fingers; the zinc sites are located at opposite ends of a beta-sheet.
Surrounding loops vary significantly in length and sequence between these three domains.
(NCI);