NECAP 1 is a 275 amino acid cell membrane protein belonging to the NECAP family that localizes to the clathrin-coated vesicle membrane. NECAP 1 is encoded by a gene that maps to human chromosome 12p13.31 and contains two WXXF motifs that are used to mediate binding of accessory proteins to ear domains of various proteins such as AP-1, AP-2 and GGAs. Expressed primarily in brain and existing as two alternatively spliced isoforms, NECAP 1 colocalizes with AP-2 at the plasma membrane by binding AP-2s alpha-ear domain.

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