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Aliases ABI1, ABI-1, ABLBP4, E3B1, NAP1BP, SSH3BP, SSH3BP1, abl interactor 1
External IDs MGI: 104913 HomoloGene: 38053 GeneCards: ABI1
RNA expression pattern
PBB GE ABI1 209028 s at fs.png

PBB GE ABI1 209027 s at fs.png
More reference expression data
Species Human Mouse
RefSeq (mRNA)
RefSeq (protein)
Location (UCSC) Chr 10: 26.75 – 26.86 Mb Chr 2: 22.94 – 23.04 Mb
PubMed search [1] [2]
View/Edit Human View/Edit Mouse

Abl interactor 1 also known as Abelson interactor 1 (Abi-1) is a protein that in humans is encoded by the ABI1 gene.[3][4]


Abl interactor 1 has been found to form a complex with EPS8 and SOS1, and is thought to be involved in the transduction of signals from Ras to Rac. In addition, the encoded protein may play a role in the regulation of EGF-induced Erk pathway activation as well as cytoskeletal reorganization and EGFR signaling. Several transcript variants encoding multiple isoforms have been found for this gene.[5]

Abi1 is adaptor protein. It interacts with c-Abl and WAVE2 which is an actin polymerization regulator. It is known that Abi1 enhances the phosphorylation of WAVE2 by c-Abl. The phosphorylation of c-Abl promotes actin polymerization. Furthermore, Abi1 is a component of the WAVE complex. Some research has shown that knockdown of Abi1 by siRNA promoted degradation of WAVE complex proteins.[citation needed]


ABI1 has been shown to interact with

ENAH,[6] NCKAP1,[7] EPS8,[4][6][7][8][9] and SOS1.[10]


  1. ^ "Human PubMed Reference:". 
  2. ^ "Mouse PubMed Reference:". 
  3. ^ Ziemnicka-Kotula D, Xu J, Gu H, Potempska A, Kim KS, Jenkins EC, Trenkner E, Kotula L (Jul 1998). "Identification of a candidate human spectrin Src homology 3 domain-binding protein suggests a general mechanism of association of tyrosine kinases with the spectrin-based membrane skeleton". J Biol Chem. 273 (22): 13681–92. doi:10.1074/jbc.273.22.13681. PMID 9593709. 
  4. ^ a b Biesova Z, Piccoli C, Wong WT (Feb 1997). "Isolation and characterization of e3B1, an eps8 binding protein that regulates cell growth". Oncogene. 14 (2): 233–41. doi:10.1038/sj.onc.1200822. PMID 9010225. 
  5. ^ "Entrez Gene: ABI1 abl-interactor 1". 
  6. ^ a b Tani K, Sato S, Sukezane T, Kojima H, Hirose H, Hanafusa H, Shishido T (June 2003). "Abl interactor 1 promotes tyrosine 296 phosphorylation of mammalian enabled (Mena) by c-Abl kinase". J. Biol. Chem. 278 (24): 21685–92. doi:10.1074/jbc.M301447200. PMID 12672821. 
  7. ^ a b Yamamoto A, Suzuki T, Sakaki Y (June 2001). "Isolation of hNap1BP which interacts with human Nap1 (NCKAP1) whose expression is down-regulated in Alzheimer's disease". Gene. 271 (2): 159–69. doi:10.1016/S0378-1119(01)00521-2. PMID 11418237. 
  8. ^ Offenhäuser N, Borgonovo A, Disanza A, Romano P, Ponzanelli I, Iannolo G, Di Fiore PP, Scita G (January 2004). "The eps8 Family of Proteins Links Growth Factor Stimulation to Actin Reorganization Generating Functional Redundancy in the Ras/Rac Pathway". Mol. Biol. Cell. 15 (1): 91–8. doi:10.1091/mbc.E03-06-0427. PMC 307530Freely accessible. PMID 14565974. 
  9. ^ Lanzetti L, Rybin V, Malabarba MG, Christoforidis S, Scita G, Zerial M, Di Fiore PP (November 2000). "The Eps8 protein coordinates EGF receptor signalling through Rac and trafficking through Rab5". Nature. 408 (6810): 374–7. doi:10.1038/35042605. PMID 11099046. 
  10. ^ Scita G, Nordstrom J, Carbone R, Tenca P, Giardina G, Gutkind S, Bjarnegård M, Betsholtz C, Di Fiore PP (September 1999). "EPS8 and E3B1 transduce signals from Ras to Rac". Nature. 401 (6750): 290–3. doi:10.1038/45822. PMID 10499589. 

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