WASH complex subunit 1 - A8K0Z3 (WASH1_HUMAN)

 

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Function
Acts as a component of the WASH core complex that functions as a nucleation-promoting factor (NPF) at the surface of endosomes, where it recruits and activates the Arp2/3 complex to induce actin polymerization, playing a key role in the fission of tubules that serve as transport intermediates during endosome sorting (PubMed:19922874, PubMed:19922875, PubMed:20498093, PubMed:23452853). Involved in endocytic trafficking of EGF (By similarity). Involved in transferrin receptor recycling. Regulates the trafficking of endosomal alpha5beta1 integrin to the plasma membrane and involved in invasive cell migration (PubMed:22114305). In T-cells involved in endosome-to-membrane recycling of receptors including T-cell receptor (TCR), CD28 and ITGAL; proposed to be implicated in T cell proliferation and effector function. In dendritic cells involved in endosome-to-membrane recycling of major histocompatibility complex (MHC) class II probably involving retromer and subsequently allowing antigen sampling, loading and presentation during T-cell activation (By similarity). Involved in Arp2/3 complex-dependent actin assembly driving Salmonella typhimurium invasion independent of ruffling. Involved in the exocytosis of MMP14 leading to matrix remodeling during invasive migration and implicating late endosome-to-plasma membrane tubular connections and cooperation with the exocyst complex (PubMed:24344185). Involved in negative regulation of autophagy independently from its role in endosomal sorting by inhibiting BECN1 ubiquitination to inactivate PIK3C3/Vps34 activity (By similarity). UniProt
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Subunit Structure
Component of the WASH core complex also described as WASH regulatory complex (SHRC) composed of WASH (WASHC1, WASH2P or WASH3P), WASHC2 (WASHC2A or WASHC2C), WASHC3, WASHC4 and WASHC5. The WASH core complex associates via WASHC2 with the F-actin-capping protein dimer (formed by CAPZA1, CAPZA2 or CAPZA3 and CAPZB) in a transient or substoichiometric manner which was initially described as WASH complex (PubMed:19922875, PubMed:20498093). Interacts (via WHD1 region) with WASHC2C; the interaction is direct (PubMed:19922874). Interacts with VPS35; mediates the association with the retromer CSC complex. Interacts with FKBP15. Interacts with alpha-tubulin. Interacts with BECN1; this interaction can be competed out by AMBRA1 binding. Interacts with BLOC1S2; may associate with the BLOC-1 complex. Interacts with tubulin gamma chain (TUBG1 or TUBG2) (By similarity). Interacts with EXOC1, EXOC4, EXOC8; in MMP14-positive endosomes in breast tumor cells; indicative for an association with the exocyst complex (PubMed:24344185). Interacts with TBC1D23 (PubMed:29084197). UniProt
Domain
The VCA (verprolin, cofilin, acidic) domain promotes actin polymerization by the Arp2/3 complex in vitro. UniProt
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Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
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Data in blue originates from PDB
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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