Structure
ZASP is a PDZ domain-containing protein. PDZ motifs are modular protein-protein interaction domains consisting of 80-120 amino acid residues. PDZ domain-containing proteins interact with each other in cytoskeletal assembly or with other proteins involved in targeting and clustering of membrane proteins. ZASP interacts with alpha-actinin-2 through its N-terminal PDZ domain and with protein kinase C via its C-terminal LIM domains. The LIM domain is a cysteine-rich motif defined by 50-60 amino acids containing two zinc-binding modules. This protein also interacts with all three members of the myozenin family. [5]
Human ZASP can exist in cardiac and skeletal cells as six distinct isoforms, based on alternative splicing of 16 exons. [7] There are 2 ZASP short forms (Uniprot ID: O75112-6, 31.0 kDa, 283 amino acids; [8] and Uniprot ID: O75112-5, 35.6 kDa, 330 amino acids); [9] and 4 ZASP long forms (Uniprot ID: O75112-4, 42.8 kDa, 398 amino acids; [10] Uniprot ID: O75112-3, 50.6 kDa, 470 amino acids; [11] Uniprot ID: O75112-2, 66.6 kDa, 617 amino acids; [12] and Uniprot ID: O75112, 77.1 kDa, 727 amino acids). [13] [14] All ZASP isoforms have an N-terminal PDZ domain; internal, conserved sequences known as ZASP-like motifs (ZMs); and the four long isoforms have three C-terminal LIM domains. [7]
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