Alpha-actinin is a ubiquitously expressed cytoskeletal protein found in numerous actin structures. It consists of an N-terminal actin-binding domain, a central rod domain, and a C-terminal domain; the protein functions as a homodimer to cross-link actin filaments. The rod domain determines the distance between cross-linked actin filaments and also serves as an interaction site for several cytoskeletal and signaling proteins (1). Alpha-actinin 4 is a non-muscle isoform version of alpha-actinin that is concentrated in the cytoplasm (2). It plays a role in cell motility, invasion, and metastasis of cancer cells (3). Alpha-actinin 4 is commonly expressed in filopodia, lamellipodia, stress fibers, and sites of adhesion (4).
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