PMID: 15062084 , Related PDB id: 1RGW

Authors:

Au Y, Atkinson RA, Guerrini R, Kelly G, Joseph C, Martin SR, Muskett FW, Pallavicini A, Faulkner G, Pastore A

Title:

Solution structure of ZASP PDZ domain; implications for sarcomere ultrastructure and enigma family redundancy.

Journal:

Structure. 2004 Apr;12(4):611-22.

Abstract:

Z band alternately spliced PDZ-containing protein (ZASP) is a sarcomere Z disk protein expressed in human cardiac and skeletal muscle that is thought to be involved in a dominant familial dilated cardiomyopathy. The N-terminal PDZ domain of ZASP interacts with the C terminus of alpha-actinin-2, the major component of the Z disk, probably by forming a ternary complex with titin Z repeats. We have determined the structure of ZASP PDZ by NMR and showed that it is a classical class 1 PDZ domain that recognizes the carboxy-terminal sequence of an alpha-actinin-2 calmodulin-like domain with micromolar affinity. We also characterized the role of each component in the ternary complex ZASP/alpha-actinin-2/titin, showing that the alpha-actinin-2/ZASP PDZ interaction involves a binding surface distinct from that recognized by the titin Z repeats. ZASP PDZ structure was used to model other members of the enigma family by homology and to predict their abilities to bind alpha-actinin-2.