GIPC PDZ domain containing family, member 1 (GIPC1) is a protein that in humans is encoded by the GIPC1 gene. [5] [6] [7] GIPC was originally identified as it binds specifically to the C terminus of RGS-GAIP, a protein involved in the regulation of G protein signaling. [5] GIPC is an acronym for "GAIP Interacting Protein C-terminus". RGS proteins are "Regulators of G protein Signaling" and RGS-GAIP is a "GTPase Activator protein for Gαi/Gαq", which are two major subtypes of Gα proteins. The human GIPC1 molecule is 333 amino acids or about 36 kDa in molecular size and consists of a central PDZ domain, a compact protein module which mediates specific protein-protein interactions. The RGS-GAIP protein interacts with this domain and many other proteins interact here or at other parts of the GIPC1 molecule. As a result, GIPC1 was independently discovered by several other groups and has a variety of alternate names, including synectin, C19orf3, RGS19IP1 and others. The GIPC1 gene family in mammals consisting of three members, so the first discovered, originally named GIPC, is now generally called GIPC1, with the other two being named GIPC2 and GIPC3. [8] The three human proteins are about 60% identical in protein sequence. GIPC1 has been shown to interact with a variety of other receptor and cytoskeletal proteins including the GLUT1 receptor, ACTN1, KIF1B, MYO6, PLEKHG5, SDC4/syndecan-4, SEMA4C/semaphorin-4 and HTLV-I Tax. The general function of GIPC family proteins therefore appears to be mediating specific interactions between proteins involved in G protein signaling and membrane translocation.
GIPC1 has been shown to interact with:
GIPC PDZ domain containing family, member 2, GIPC2
GIPC PDZ domain containing family, member 3, GIPC3
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Low density lipoprotein receptor-related protein 2 also known as LRP-2 or megalin is a protein which in humans is encoded by the LRP2 gene.
Protein Interacting with C Kinase - 1 is a protein that in humans is encoded by the PICK1 gene.
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Syntenin-1 is a protein that in humans is encoded by the SDCBP gene.
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Amyloid beta A4 precursor protein-binding family A member 1 is a protein that in humans is encoded by the APBA1 gene.
Na(+)/H(+) exchange regulatory cofactor NHE-RF3 is a protein that in humans is encoded by the PDZK1 gene.
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Regulator of G-protein signaling 7 is a protein that in humans is encoded by the RGS7 gene.
Multiple PDZ domain protein is a protein that in humans is encoded by the MPDZ gene.
Glutamate receptor-interacting protein 1 is a protein that in humans is encoded by the GRIP1 gene.
SH3 and multiple ankyrin repeat domains protein 1 is a protein that in humans is encoded by the SHANK1 gene.
Regulator of G-protein signaling 1 is a protein that in humans is encoded by the RGS1 gene.
Regulator of G-protein signaling 12 is a protein that in humans is encoded by the RGS12 gene.
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Guanine nucleotide-binding protein G(k) subunit alpha is a protein that in humans is encoded by the GNAI3 gene.