Proteins in this family contains Xin repeats, which define an actin-binding motif. In humans two Xin-repeat proteins have been identified, XIRP1 and XIRP2. They are expressed during early developmental stages of cardiac and skeletal muscles []and have an important role in cardiac development and function []. They bind to and stabilise F-actin [].The homologues in mouse and chicken localise in the adherens junction complex of the intercalated disc in cardiac muscle and in the myotendon junction of skeletal muscle. Mouse Xin may co-localise with Vinculin which is known to attach the actin to the cytoplasmic membrane []. Human XIRP1 binds the EVH1 domains of Ena/VASP proteins and filamin C []. It also binds the SH3 domain of nebulin and nebulette []. The multiplicity of binding partners suggests that Xin acts as a multi-adaptor protein during myofibril development and repair [].
Proteins in this family contains Xin repeats, which define anactin-binding motif. In humans two Xin-repeat proteins have been identified, XIRP1 and XIRP2. They are expressed during early developmental stages of cardiac and skeletal muscles []and have an important role in cardiac development and function []. They bind to and stabilise F-actin [].This entry represents XIRP2, also known as Xin-beta. In mouse, it initiates the maturation of the intercalated discs (ICDs)during postnatal heart development [].
