Abl-interactor (Abi) proteins are targets of Abl-family nonreceptor tyrosine kinases and are required for cytoskeletal reorganization []. Abi1 and Abi2 play an important role in actin cytoskeleton dynamics through participation in several multiprotein complexes. They participate in the formation of the Abi/WAVE complex, which regulates Arp2/3-mediated actin filament nucleation and actin network assembly [, , ].Abi1 promotes tyrosine phosphorylation of mammalian enabled (Mena) by c-Abl kinase []. It is essential for WAVE2 complex integrity and embryonic survival in mice []. Abi1 and the p85 regulatory subunit of PI-3 kinase may be the link between actin cytoskeleton remodelling and growth receptor signalling [].
This entry includes EPS8 and EPS8L1-3 from animals.Epidermal growth factor receptor kinase substrate 8 (EPS8) is a signalling adapter that possesses actin binding, bundling, and barbed-end capping activities []. It forms a complex with Sos-1, Abi1 and the lipid kinase phosphoinositide 3-kinase (PI3-K) to regulate Rac activation that leads to actin cytoskeletal remodeling []. It is critical for dendritic cell migration []. It is involved in the initial growth of stereocilia in both inner hair cells and outer hair cells []. It also regulates axonal filopodia in hippocampal neurons in response to brain-derived neurotrophic factor (BDNF) []. It has been linked to proliferation, metastasis and prognosis of many malignant tumours [].Similarly to EPS8, EPSLs interact with Abi1 and Sos-1. However, only EPS8L1 and EPS8L2 activate the Rac-GEF activity of Sos-1, and bind to actin in vivo []. Eps8L2 null-mutant mice has been shown to exhibit a late-onset, progressive hearing loss that is directly linked to a gradual deterioration in hair bundle morphology [].
Abl-interactor (Abi) proteins are targets of Abl-family nonreceptor tyrosine kinases and are required for cytoskeletal reorganization []. Abi1 and Abi2 play an important role in actin cytoskeleton dynamics through participation in several multiprotein complexes. They participate in the formation of the Abi/WAVE complex, which regulates Arp2/3-mediated actin filament nucleation and actin network assembly [, , ].Abi2 is a component of the WAVE1 complex. It localises to sites of actin polymerisation at the tips of lamellipodia and filopodia []. Its structure has been solved [].
Epidermal growth factor receptor kinase substrate 8 (EPS8) is a signalling adapter that possesses actin binding, bundling, and barbed-end capping activities []. It forms a complex with Sos-1, Abi1 and the lipid kinase phosphoinositide 3-kinase (PI3-K) to regulate Rac activation that leads to actin cytoskeletal remodeling []. It is critical for dendritic cell migration []. It is involved in the initial growth of stereocilia in both inner hair cells and outer hair cells []. It also regulates axonal filopodia in hippocampal neurons in response to brain-derived neurotrophic factor (BDNF) []. It has been linked to proliferation, metastasis and prognosis of many malignant tumours [].
This entry represents the SH3 domain found in Eps8 and Eps8-like proteins including Eps8-like 1-3. These proteins contain N-terminal phosphotyrosine-binding (PTB), central SH3, and C-terminal effector domains. The SH3 domains of Eps8 and similar proteins recognize peptides containing a PxxDY motif, instead of the classical PxxP motif []. Epidermal growth factor receptor kinase substrate 8 (EPS8) is a signalling adapter that possesses actin binding, bundling, and barbed-end capping activities []. It forms a complex with Sos-1, Abi1 and the lipid kinase phosphoinositide 3-kinase (PI3-K) to regulate Rac activation that leads to actin cytoskeletal remodeling []. It is critical for dendritic cell migration []. It is involved in the initial growth of stereocilia in both inner hair cells and outer hair cells []. It also regulates axonal filopodia in hippocampal neurons in response to brain-derived neurotrophic factor (BDNF) []. It has been linked to proliferation, metastasis and prognosis of many malignant tumours [].
Abi1, also called e3B1, is a central regulator of actin cytoskeletal reorganization through interactions with many protein complexes. It is part of WAVE, a nucleation-promoting factor complex, that links Rac 1 activation to actin polymerization causing lamellipodia protrusion at the plasma membrane [, ]. Abi1 is a target of alpha4 integrin, regulating membrane protrusions at sites of integrin engagement []. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration []. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain.This entry represents the SH3 domain of Abi1.
