Phosphoinositide 3-kinase regulatory subunit 6 (Pik3r6)

Regulatory subunit of the PI3K gamma complex. Acts as an adapter to induce activation of PIK3CG by beta-gamma G protein dimers.

The PIK3CG:PIK3R6 heterodimer is much less sensitive to beta-gamma G proteins compared to PIK3CG:PIK3R5 and its membrane recruitment and beta-gamma G protein dimer-dependent activation requires HRAS bound to PIK3CG. Recruits of the PI3K gamma complex to a PDE3B:RAPGEF3 signaling complex involved in angiogenesis; signaling appears to involve RRAS.