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更新时间：2025-08-05
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Alpha-actinin （α-actinin） is a ubiquitous cytoskeletal protein, which belongs to the superfamily of filamentous actin （F-actin） crosslinking proteins. It is present in multiple subcellular regions of both muscle and non-muscle cells, including cell-cell and cell-matrix contact sites, cellular protrusions and stress fiber dense regions and thus, it seems to bear multiple important roles in the cell by linking the cytoskeleton to many different transmembrane proteins in a variety of junctions. Four isoforms of human α-actinin have already been identified namely, the "muscles" α-actinin-2 and α-actinin-3 and the "non-muscles" α-actinin-1 and α-actinin-4 [PMID: 21241830]. α-actinin-1 is an important intracellular calcium-sensing protein, the major actin crosslinking protein in focal adhesions and stress fibers [PMID: 27272015].
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