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Biol Bull 156: 93-102. (February 1979)
© 1979 Marine Biological Laboratory
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PROTEIN SYNTHESIS IN LIVER, MUSCLE AND GILL OF MULLET (MUGIL CEPHALUS L.) IN VIVO

AUDREY E. V. HASCHEMEYER 1 and MICHAEL A. K. SMITH 1

1 Department of Biological Sciences, Hunter College, Box 741, New York, New York 10021

1. Protein synthesis in mullet was measured by use of pulse injections of 14C-leucine into the hepatic portal circulation and by 4-hr continuous infusion of 14C-tyrosine into the dorsal aorta.

2. Liver protein synthesis was 37 mg/day per g wet weight of tissue. Plasma proteins accounted for about 25% of total liver protein synthesis. Replacement rate for intrahepatic proteins was 20%/day. Average polypeptide chain synthesis time was 3 min.

3. Gill protein synthesis was comparable to that in liver with a replacement rate of 23%/day.

4. Muscle protein synthetic rate was 0.54%/day, comparable to rates in rabbit and sheep when temperature difference is taken into account.

5. Constant infusion is shown to be a feasible technique for measurement of protein metabolism of fish in vivo.




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