J. Karasinski, MYOSIN POLYMORPHISM IN FISH CARDIAC MUSCLES, Comparative biochemistry and physiology. B. Comparative biochemistry, 106(4), 1993, pp. 1037-1040
1. Native myosin and myosin heavy chain of ventricular and atrial musc
les of some teleost species were analysed electrophoretically. 2. The
presence of single isoforms of native myosin and myosin heavy chain in
the whole ventricle of carp, tench, pike and rainbow trout suggests t
hat both layers of ventricular myocardium (compact and spongious) expr
ess similar, or even the same, myosin. 3. Ventricle and atrium contain
distinct isoforms of native myosin and/or myosin heavy chain. It is s
uggested that differences in MHC content in ventricular and atrial myo
cardium may imply different contractile properties of these muscles.