Biochemical Properties of Chimeric Skeletal and Smooth Muscle Myosin Light Chain Kinases

Overview

Journal J Biol Chem

Specialty Biochemistry

Date 1992 Mar 5

PMID 1371510

Citations 9

Authors

S A Leachman

P J Gallagher

B P Herring

M J McPhaul

J T Stull

Affiliations

Soon will be listed here.

Abstract

The molecular and biochemical properties of myosin light chain kinases from chicken skeletal and smooth muscle were investigated by recombinant DNA techniques. Deletion of the amino-terminal region of either the smooth or skeletal muscle myosin light chain kinase resulted in a decrease in Vmax with no significant change in Km values for light chain substrates. Skeletal/smooth muscle chimeric kinases were inactive when a 65-residue region amino-terminal of the catalytic core was exchanged between the two forms. Changing alanine 494 to glutamic acid within this region in the chicken skeletal muscle myosin light chain kinase increased the Km values for light chains 10-fold. These results are consistent with the hypothesis that the region amino-terminal of the catalytic core in myosin light chain kinases is involved in light chain recognition. A skeletal muscle kinase which contained the smooth muscle calmodulin binding domain remained regulated by Ca2+/calmodulin. Thus, the calmodulin binding domains of smooth and skeletal muscle myosin light chain kinases share structural elements necessary for regulation.

Citing Articles

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