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The Journal of Cell Biology, Vol 81, 115-122, Copyright © 1979 by The Rockefeller University Press

ARTICLES

Myosin synthesis in embryonic chicken fibroblasts

RB Young, WG Bergen and PB Blauwiekel

The rate of constitutive myosin synthesis was measured in cultures of replicating embryonic chicken skin fibroblasts by pulse labeling with [3H]leucine. These cells synthesized the 200,000-dalton heavy chain of myosin (MHC) at a rate of 3.2 x 10(3) molecules/cell/min. Additionally, an independent estimate of the MHC synthesis rate needed to maintain a constant level of constitutive MHC/cell was calculated from total protein content, percentage MHC, fibroblast doubling time, and MHC half- life. This calculated rate of approximately 2.9 x 10(3) molecules/cell/min was in close agreement with the measured rate. By comparison, the synthesis rate of myofibrillar MHC in fully activated muscle cell cultures was approximately 2.9 x 10(4) molecules/nucleus/min.
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