Triadin [SEP] chromosome
Triadin
Triadin, also known as TRDN, is a human gene associated with the release of calcium ions from the sarcoplasmic reticulum triggering muscular contraction through calcium-induced calcium release. Triadin is a multiprotein family, arising from different processing of the TRDN gene on chromosome 6. It is a transmembrane protein on the sarcoplasmic reticulum due to a well defined hydrophobic section and it forms a quaternary complex with the cardiac ryanodine receptor (RYR2), calsequestrin (CASQ2) and junctin proteins. The luminal (inner compartment of the sarcoplasmic reticulum
) section of Triadin has areas of highly charged amino acid residues that act as luminal Ca receptors. Triadin is also able to sense luminal Ca concentrations by mediating interactions between RYR2 and CASQ2. Triadin has several different forms; Trisk 95 and Trisk 51, which are expressed in skeletal muscle, and Trisk 32 (CT1), which is mainly expressed in cardiac muscle.
Interactions.
TRDN has been shown to interact with RYR1.
Triadin is required to physically link the RYR2 and CASQ2 proteins, so that RYR2 channel