myosin heavy chain 2; myosin heavy chain 2a; MyHC-2a; myosin heavy chain IIa; MyHC-IIa; myosin heavy chain, skeletal muscle, adult 2 (MYH2, MYHSA2)
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Function
- muscle contraction
- myosin heavy chain
- required for cytoskeleton organization (putative)
Structure
- muscle myosin is a hexameric protein that consists of
- 2 myosin heavy chain subunits
- 2 myosin essential light chain subunits
- 2 myosin regulatory light chain subunits
- each myosin heavy chain can be split into 1 light meromyosin & 1 heavy meromyosin; it can later be split further into 2 globular subfragments (S1) & 1 rod-shaped subfragment (S2)
- rodlike tail sequence is highly repetitive, showing cycles of a 28-residue repeat pattern composed of 4 heptapeptides, characteristic for alpha-helical coiled coils
- contains 1 IQ domain
- contains 1 myosin head-like domain
Compartment
- cytoplasm, myofibril
- thick filaments of the myofibrils
Expression
found in adult skeletal muscle
Pathology
- defects in MYH2 are the cause of inclusion body myopathy type 3