Myosin light chain kinase 4 also known as MYLK4 is an enzyme which in humans is encoded by the MYLK2 gene. MYLK4 is a member of the myosin light-chain kinase family of serine/threonine-specific protein kinases that phosphorylate the regulatory light chain of myosin II.

This protein acts as an enzyme that catalyzes the following reaction: ATP protein -> ADP is phosphoprotein.

MYLK4 is also involved in protein amino acid phosphorylation means that it adds phosphate group to the molecule.

Not very much is known about the specific functional characteristics MLYK4, but recently it was found that the gene may play a role in at least one driver mutation for Cancer. MYLK4 may also be involved in transferase activity, ATP binding, protein serine / threonine kinases activity and nucleotide binding. Other names for MYLK4 are CaMLCK as EG238564, MYLK4 myosin light chain kinase family, member 4, SgK085 Sgk085, Sugen kinase 85, non-specific serine / threonine-protein kinase SgK085.

There are other known myosin light chain kinase enzymes.