Protein Domain : MIR motif IPR016093

Type	Domain
Description	The MIR domain is named after three of the proteins in which it occurs: protein Mannosyltransferase ( ), Inositol 1,4,5-trisphosphate receptor (IP3R) and Ryanodine receptor (RyR). MIR domains have also been found in eukaryotic stromal cell-derived factor 2 (SDF-2) [ ] and in Chlamydia trachomatis protein CT153. The MIR domain may have a ligand transferase function. This domain has a closed β-barrel structure with a hairpin triplet, and has an internal pseudo-threefold symmetry. The MIR motifs that make up the MIR domain consist of ~50 residues and are often found in multiple copies.Inositol 1,4,5-trisphosphate (InsP3) is an intracellular second messenger that transduces growth factor and neurotransmitter signals. InsP3 mediates the release of Ca 2+from intracellular stores by binding to specific Ca 2+channel-coupled receptors. Ryanodine receptors are involved in communication between transverse-tubules and the sarcoplamic reticulum of cardiac and skeletal muscle. The proteins function as a Ca 2+-release channels following depolarisation of transverse-tubules [ ]. The function is modulated by Ca2+, Mg2+, ATP and calmodulin. Deficiency in the ryanodine receptor may be the cause of malignant hyperthermia (MH) and of central core disease of muscle (CCD) [ ]. protein O-mannosyltransferases transfer mannose from DOL-P-mannose to ser or thr residues on proteins.
Short Name	MIR_motif