The PHD finger (Plant Homeo Domain) was discovered in 1993 as a Cys4-His-Cys3 motif in the homeodomain protein HAT3 in Arabidopsis thaliana. The PHD finger motif resembles the metal binding RING domain (Cys3-His-Cys4) and FYVE domain. It occurs as a single finger, but often in clusters of two or three, and it also occurs together with other domains, such as the chromodomain and the bromodomain.
Read more about PHD Finger: PHD Finger in Proteins Related To Epigenetics, Structure Data On The PHD Finger, Function of The PHD Finger
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