ACAP1 and ACAP2 were recruited to platelet-derived growth factor (PDGF)-induced dorsal membrane ruffles in NIH 3T3 mouse fibroblasts, and overexpression inhibited ruffle formation. The deduced protein contains 740 amino acids and shares 52% sequence identity with CENTB2. highest expression in spleen, thymus, and peripheral blood leukocytes, intermediate expression in lung, testis, and small intestine, and weak expression in prostate, ovary, and colon. No expression was detected in heart, brain, placenta, liver, skeletal muscle, kidney, and pancreas, and no expression was detected in HeLa cells.ACAP1 shares significant similarity with CENTB2, which the authors called ACAP2, and 95% identity with mouse Acap1.
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