PDZ and LIM domain protein 4 (PDLIM4)

Isoform 1: Suppresses SRC activation by recognizing and binding to active SRC and easing PTPN13-mediated dephosphorylation of SRC'Tyr-419' leading to its inactivation. Involved in reorganization of the actin cytoskeleton (PubMed:21636573).

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. Involved in regulation of the synaptic AMPA receptor transfer in dendritic spines of hippocampal pyramidal neurons directing the receptors toward an insertion at the postsynaptic membrane.