Myosin regulatory light chain 2, ventricular/cardiac muscle isoform (MYL2)

Contractile protein which plays a role in heart development and function (By similarity). Following phosphorylation, plays a part in cross-bridge cycling kinetics and cardiac muscle contraction by increasing myosin lever arm stiffness and promoting myosin head diffusion; as a result 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 way to fine-tune myofilament calcium sensitivity to induce (By similarity). During cardiogenesis plays an early role in cardiac contractility by promoting cardiac myofibril assembly (By similarity).