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BAIAP2
BAIAP2 Full Name
BAI1-associated protein 2
BAIAP2 Introduction
BAIAP2 (BAI1-associated protein 2), also known as IRSp53 (insulin receptor substrate protein of 53 kDa), is a membrane–cytoskeleton adaptor that helps cells translate changes in membrane shape into organized actin remodeling. Originally identified as a binding partner of the brain-specific angiogenesis inhibitor BAI1, BAIAP2 contains an N-terminal I-BAR domain, a Cdc42/Rac-interacting region, and an SH3 domain, enabling it to connect membrane curvature, small GTPase signaling, and actin-regulatory proteins. As a founding member of the I-BAR protein family, IRSp53 can sense and induce membrane curvature and promote the formation of actin-rich membrane protrusions such as filopodia. This makes BAIAP2 particularly relevant when conventional analysis of either membrane signaling or the cytoskeleton alone cannot fully explain changes in cell morphology, migration, or neuronal structure. Experimental studies have shown that IRSp53 can cluster on PIP2-enriched membranes and recruit VASP to locally promote actin polymerization, providing a mechanistic link between membrane dynamics and protrusion formation.
In the nervous system, BAIAP2 has an additional role as an important postsynaptic scaffold and actin organizer. IRSp53 is highly enriched in dendritic spines and the postsynaptic density (PSD), where it interacts with proteins including PSD-95, Shank family scaffolds, and F-actin. Recent work indicates that IRSp53 contributes to PSD organization by promoting condensate formation and directly supporting actin filament bundling, providing a structural connection between synaptic signaling complexes and the actin cytoskeleton. This function is important for maintaining dendritic spine architecture and coordinating excitatory synaptic signaling. Because synaptic structure and receptor organization are tightly coupled to neuronal communication, altered BAIAP2 activity can affect multiple levels of neuronal function rather than producing a single isolated molecular phenotype. Studies in IRSp53-deficient mice have reported changes in dendritic development, synaptic plasticity, NMDA receptor signaling, and social behavior, while restoration of IRSp53 in adult mutant mice has been shown to partially rescue synaptic and behavioral abnormalities.
From a disease-research perspective, BAIAP2 is therefore of interest primarily as a regulator of neuronal connectivity, synaptic signaling, and cytoskeletal dynamics, with additional relevance to abnormal cell migration and membrane remodeling. Genetic and experimental evidence has linked IRSp53/BAIAP2 dysfunction to neurodevelopmental and neuropsychiatric phenotypes, including autism spectrum disorder, schizophrenia-related traits, and attention-deficit/hyperactivity-associated behaviors. In mouse models, loss of IRSp53 can produce impaired social interaction, altered excitatory–inhibitory balance, abnormal NMDA receptor function, and changes in neuronal plasticity, supporting the view that disturbed BAIAP2-dependent signaling may contribute to disease mechanisms rather than merely serving as a disease-associated marker. At the same time, the evidence remains context-dependent, and BAIAP2 should not be regarded as an established therapeutic target for these disorders without further validation in human disease models. Its ability to integrate membrane curvature, Rho-family GTPase signaling, actin organization, and postsynaptic architecture nevertheless makes BAIAP2 a valuable target for investigating synaptic dysfunction, neuronal development, membrane protrusion biology, and related disease pathways.
Alternate Names for BAIAP2
BAIAP2; BAI1-associated protein 2; brain-specific angiogenesis inhibitor 1-associated protein 2; BAP2; IRS-58; IRSp53/58; fas ligand-associated factor 3; insulin receptor substrate p53/p58; insulin receptor substrate protein of 53 kDa; FLAF3; IRSP53;
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