Characterization of chicken skeletal muscle myosin light chain kinase. Evidence for muscle-specific isozymes

M. H. Nunnally, S. B. Rybicki, J. T. Stull

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

Myosin light chain kinase purified from chicken white skeletal muscle (M(r) = 150,000) was significantly larger than both rabbit skeletal (M(r) = 87,000) and chicken gizzard smooth (M(r) = 130,000) muscle myosin light chain kinases, as determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. K(m) and V(max) values with rabbit or chicken skeletal, bovine cardiac, and chicken gizzard smooth muscle myosin P-light chains were very similar for the chicken and rabbit skeletal muscle myosin light chain kinases. In contrast, comparable K(m) and V(max) data for the chicken gizzard smooth muscle myosin light chain kinase showed that this enzyme was catalytically very different from the two skeletal muscle kinases. Affinity-purified antibodies to rabbit skeletal muscle myosin light chain kinase cross-reacted with chicken skeletal muscle myosin light chain kinase, but the titer of cross-reacting antibodies was ~ 20-fold less than the anti-rabbit skeletal muscle myosin light chain kinase titer. There was no detectable antibody cross-reactivity against chicken gizzard myosin light chain kinase. Proteolytic digestion followed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis or high performance liquid chromatography showed that these enzymes are structurally very different with few, if any, overlapping peptides. These data suggest that, although chicken skeletal muscle myosin light chain kinase is catalytically very similar to rabbit skeletal muscle myosin light chain kinase, the two enzymes have different primary sequences. The two skeletal muscle myosin light chain kinases appear to be more similar to each other than either is to chicken gizzard smooth muscle myosin light chain kinase.

Original languageEnglish (US)
Pages (from-to)1020-1026
Number of pages7
JournalJournal of Biological Chemistry
Volume260
Issue number2
StatePublished - Jan 1 1985

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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