Function
Suppresses SRC activation by recognizing and binding to active SRC and facilitating PTPN13-mediated dephosphorylation of SRC 'Tyr-419' leading to its inactivation. Inactivated SRC dissociates from this protein allowing the initiation of a new SRC inactivation cycle (By similarity). Involved in reorganization of the actin cytoskeleton. In nonmuscle cells, binds to ACTN1 (alpha-actinin-1), increases the affinity of ACTN1 to F-actin (filamentous actin), and promotes formation of actin stress fibers (PubMed:14729062, PubMed:22659164). Involved in regulation of the synaptic AMPA receptor transport in dendritic spines of hippocampal pyramidal neurons directing the receptors toward an insertion at the postsynaptic membrane. Links endosomal surface-internalized GRIA1-containing AMPA receptors to the alpha-actinin/actin cytoskeleton. Increases AMPA receptor-mediated excitatory postsynaptic currents in neurons (PubMed:15456832).
Sequence
MTHAVTLRGPSPWGFRLVGGRDFSAPLTISRVHAGSKAALAALCPGDSIQAINGESTELMTHLEAQNRIKGCHDHLTLSVSRPENKNWPSSPNDKAQAHRIHIDPEAQDGSPATSRRSSISGISLEDNRSGLGSPYGQPPRLPVPHNGSSNEVTLPSQMSALHVSPPPSADTPRILPRNRDCRVDLGSEVYRMLREPAEPAASEPKQSGSFRYLQGMLEAGEGGDRPGSGGSRNLKPAASKLGAPLSGLQGLPECTRCGHGIVGTIVKARDKLYHPECFMCSDCGLNLKQRGYFFLDERLYCENHAKARVKPPEGYDVVAVYPNAKVELV