Alpha-actinin 2 is a protein which in humans is encoded by the ACTN2 gene. This gene encodes an alpha-actinin isoform that is expressed in both skeletal and cardiac muscles and functions to anchor myofibrillar actin thin filaments and titin to Z-discs. The primary function of alpha-actinin 2 is to crosslink filamentous actin molecules and titin molecules from adjoining sarcomeres at Z-discs, a function that is modulated by phospholipids. Alpha-actinin 2 also functions in docking signalling molecules at Z-discs, and additional studies have also implicated alpha-actinin 2 in the binding of cardiac ion channels, Kv1.5 in particular.
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