p34 is a protein involved in membrane trafficking. It is known to interact with both alpha and gamma adaptin [1]. It has been speculated that p34 may play a chaperone role such as preventing the soluble adaptors from co-assembling with soluble clathrin, or helping to remove the adaptors from the coated vesicle. Another possible function is in aiding the recruitment of soluble adaptors onto the membrane [1].

1: Gamma-synergin: an EH domain-containing protein that interacts with gamma-adaptin. Page LJ, Sowerby PJ, Lui WW, Robinson MS; J Cell Biol. 1999;146:993-1004. PMID:10477754