Abstract
The time-course of changes in total amount of proteins of sarcoplasmic, myofibrillar and stromal fractions in muscle of the rats fed a protein-free diet for 8, 16, 24 and 32 days, together with the referential data of those changes in the rats fed a protein-free diet up to time of death and a 60% casein diet for 12 days was determined respectively. The results were as follows: (1) The sarcoplasmic and the myofibrillar fractions decreased much more than the stromal fraction in the earlier stages of protein depletion following the same pattern as seen in reserve proteins. (2) The sarcoplasmic fraction decreased slightly more than the myofibrillar fraction as early as 8 days of the depletion, but the relative proportion between these two fractions was thereafter almost the same as that of the standard diet group. (3) In rats fed a 60% casein diet, the sarcoplasmic fraction increased markedly than the others.
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