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. 1977 Sep 1;74(3):940–949. doi: 10.1083/jcb.74.3.940

Characterization of the myosin-phosphorylating system in normal murine astrocytes and derivative sv40 wild-type and A-mutant transformant

PMCID: PMC2110107  PMID: 198413

Abstract

Myosin and myosin light-chain kinase have been isolated and characterized from small quantities of normal and SV40-transformed, murine astrocytic neuroglial cells in culture and from intact normal mouse brain. Sodium dodecyl sulfate (SDS)-polyacrylamide gel electrophoresis of the astrocyte myosins revealed a heavy chain of 200,000 daltons and two light chains of 20,000 and 15,000 daltons. These myosins are similar to other cytyplasmic myosins. The astrocyte 20,000-dalton light chain can be phosphorylated by an endogenous myosin light-chain kinase which has properties similar to those of the myosin light-chain kinase found in human platelets. No differences were detected in either the astrocyte myosins or myosin light-chain kinases between (a) the normal and transformed cells, (b) the transformed cells grown at the permissive and nonpermissive temperatures, or (c) the SV40 wild-type and A-mutant transformants.

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Selected References

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