Ontogenetic Changes in fractional Composition of proteins From Various Types of Muscles of Rabbit

I Ivanov, Yu. Yu. Kerig, V. I. Bragin, A. E Zaitsev, W. K Nebyshynrts, L. I. Khasikina and V.A Shyndin. The Journal of Evolutionary Biochemistry and Physiology (Zhurnal Evolyutsionnoi Biokhimii i Fiziologii), 1967, 3, 193- 199

Abstract: All the main functions of the skeletal and cardiac muscles- non- protein nitrogen, total tissue nitrogen, total protein, sarcoplasmic protein and myofibrillar protein (i.e. proteins of the actomyosin group and easily soluble proteins of the T- fraction) as well as stroma proteins have been studied. Absolute and relative increases in myofibrillar proteins of the skeletal- muscles were found during ontogenesis, mainly due to an intensive increase in the actomyosin contents. Relative contents of proteins of the T- fraction does not undergo any significant changes. Stroma proteins of the skeletal muscles increase during embryogenesis and gradually decrease in postnatal development. Due to a sharp increase in myofibriller proteins, the relative contents of the sacroplasmic proteins of the skeletal muscles decrease in ontogenesis. For cardiac muscle, no significant changes were observed in the contents of the fractions studied which corresponds to the developed contractile function of the myocardium already in early ontogenesis. There is definite correlation between the fractional composition of muscle proteins and the degree of functional maturity of different types of muscles on various stages of ontogenesis.