Jump to navigation Jump to search
External IDsGeneCards: [1]
RefSeq (mRNA)



RefSeq (protein)



Location (UCSC)n/an/a
PubMed searchn/an/a
View/Edit Human

IQ motif and SEC7 domain-containing protein 1 also known as ARF-GEP100 (ADP-Ribosylation Factor - Guanine nucleotide-Exchange Protein - 100-kDa) is a protein that in humans is encoded by the IQSEC1 gene.[1][2]


The ARF-GEP100 protein is involved in signal transduction. It is a guanine nucleotide exchange factor that promotes binding of GTP to ADP ribosylation factor protein ARF6 and to a lesser extent ARF1 and ARF5.[2] This activates the ADP-ribosylation activity of the target protein and cause it to modify its substrates. ARF-GEP100, through activation of ARF6, is therefore involved in the control of processes such as endocytosis of plasma membrane proteins, E-cadherin recycling and actin cytoskeleton remodeling.[3] ARF-GEP100 appears particularly important in regulating cell adhesion, with reductions in the level of this protein causing enhanced spreading and attachment of cells.[4]

It is highly expressed in the prefrontal cortex, and throughout the rest of the brain, and is believed to have a role in learning and memory, having been detected as phosphorylated in a phospho screen of the PSD.[5]


  1. "Entrez Gene: IQSEC1 IQ motif and Sec7 domain 1".
  2. 2.0 2.1 Someya A, Sata M, Takeda K, Pacheco-Rodriguez G, Ferrans VJ, Moss J, Vaughan M (February 2001). "ARF-GEP100, a guanine nucleotide-exchange protein for ADP-ribosylation factor 6". Proc. Natl. Acad. Sci. U.S.A. 98 (5): 2413–8. doi:10.1073/pnas.051634798. PMC 30152. PMID 11226253.
  3. Hiroi T, Someya A, Thompson W, Moss J, Vaughan M (2006). "GEP100/BRAG2: Activator of ADP-ribosylation factor 6 for regulation of cell adhesion and actin cytoskeleton via E-cadherin and α-catenin". Proc. Natl. Acad. Sci. U.S.A. 103 (28): 10672–7. doi:10.1073/pnas.0604091103. PMC 1502290. PMID 16807291.
  4. Dunphy JL, Moravec R, Ly K, Lasell TK, Melancon P, Casanova JE (2006). "The Arf6 GEF GEP100/BRAG2 regulates cell adhesion by controlling endocytosis of beta1 integrins". Curr. Biol. 16 (3): 315–20. doi:10.1016/j.cub.2005.12.032. PMID 16461286.
  5. Trinidad JC, Specht CG, Thalhammer A, Schoepfer R, Burlingame AL (May 2006). "Comprehensive identification of phosphorylation sites in postsynaptic density preparations". Mol. Cell. Proteomics. 5 (5): 914–22. doi:10.1074/mcp.T500041-MCP200. PMID 16452087.

Further reading

External links