Contractile protein that plays a role in heart development and function (PubMed:23365102, PubMed:32453731). Following phosphorylation, plays a role in cross-bridge cycling kinetics and cardiac muscle contraction by increasing myosin lever arm stiffness and promoting myosin head diffusion; as a consequence of the increase in maximum contraction force and calcium sensitivity of contraction force. These events altogether slow down myosin kinetics and prolong duty cycle resulting in accumulated myosins being cooperatively recruited to actin binding sites to sustain thin filament activation as a means to fine-tune myofilament calcium sensitivity to force (By similarity). During cardiogenesis plays an early role in cardiac contractility by promoting cardiac myofibril assembly (By similarity).
Cardiomyopathy, familial hypertrophic, 10
CMH10
A hereditary heart disorder characterized by ventricular hypertrophy, which is usually asymmetric and often involves the interventricular septum. The symptoms include dyspnea, syncope, collapse, palpitations, and chest pain. They can be readily provoked by exercise. The disorder has inter- and intrafamilial variability ranging from benign to malignant forms with high risk of cardiac failure and sudden cardiac death. Rarely, patients present a variant of familial hypertrophic cardiomyopathy, characterized by mid-left ventricular chamber thickening.
None
The disease is caused by variants affecting the gene represented in this entry.
Myopathy, myofibrillar, 12, infantile-onset, with cardiomyopathy
MFM12
A form of myofibrillar myopathy, a group of chronic neuromuscular disorders characterized at ultrastructural level by disintegration of the sarcomeric Z disk and myofibrils, and replacement of the normal myofibrillar markings by small dense granules, or larger hyaline masses, or amorphous material. MFM12 is an autosomal recessive, severe form characterized by progressive myopathy with onset shortly after birth, tremor or clonus at birth, and cardiomyopathy usually leading to death by 6 months of age. Skeletal and cardiac muscle tissues show fiber-type disproportion with small type I and normal sized type II fibers, and myofibrillar disorganization.
None
The disease is caused by variants affecting the gene represented in this entry.
N-terminus is methylated by METTL11A/NTM1.
Phosphorylated by MYLK3 and MYLK2; promotes cardiac muscle contraction and function (By similarity). Dephosphorylated by PPP1CB complexed to PPP1R12B (By similarity). The phosphorylated form in adult is expressed as gradients across the heart from endocardium (low phosphorylation) to epicardium (high phosphorylation); regulates cardiac torsion and workload distribution (By similarity).
Highly expressed in type I muscle fibers.
MLC2, MYL2, MLC-2, MLC-2v, Cardiac myosin light chain 2, Ventricular myosin light chain 2, MLC-2s/v
Proteins
Developmental Biology
18789Da
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