PMID: 1138906May 1, 1975

Biogenesis of erythrocyte membrane proteins. In vivo studies in anemic rabbits

Biochimica Et Biophysica Acta
P A KochJ R Carter


To study the process of red cell membrane protein synthesis we have followed the time course of [3-H]leucine appearance in total protein and individual peptides of the erythrocyte membrane following injection of the amino acid into phenylhydrazine-anemic rabbits. Multiple peripheral blood samples were taken from single animals over a 5-week period. Erythrocyte membrane proteins were separated by polyacrylamide gel electrophoresis in sodium dodecylsulfate and dithiothreitol; incorporation of radioactivity was determined by gel slicing and liquid scintillation spectrometry. Appearance of [3-H]leucine in circulating erythrocytes reached a peak at 1-3 days, with a steady decline thereafter. The radioactive amino acid appeared first in the lowest molecular weight peptides and last in the largest peptides; at the earliest time point (8 h), little radioactivity was observed in any of the four largest peptides present in the membranes (bands A, 1, 2 and 3). Certain smaller peptides (bands 4, 5 and 9) were the predominant species labeled at this time. By 24 h all peptides showed significant incorporation. With maturation of the red cells, label largely disappeared from bands A, 9 and several smaller peptides; this was confirmed by findi...Continue Reading


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