Effect of monoclonal antibodies on the properties of smooth muscle myosin

Masaaki Ito, Paul R. Pierce, Ronald E Allen, David J. Hartshorne

Research output: Contribution to journalArticle

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Abstract

Monoclonal antibodies were generated against turkey gizzard myosin, and their effects on some of the properties of myosin were assayed. Ca2+- and Mg2+-ATPase activities of myosin were enhanced by the anti-subfragment 2 antibodies at low ionic strength (i.e., with 10S myosin). Tryptic fragments of an anti-S2 IgM also activated these activities. Antibodies directed against subfragment 1 and light meromyosm had no effect. The Mg2+-ATPase activity of heavy meromyosin also was activated by an anti-S2 antibody. Actin-activated ATPase activity of phosphorylated myosin was enhanced by the anti-S2 IgM fragments at low MgCl2 concentrations. This increase was reflected by a 5-fold increase in Vmax and a slight decrease in the apparent dissociation constant for actin. The actin-activated ATPase of dephosphorylated myosin was not affected by intact anti-S2 antibody or its fragments. The rates of phosphorylation and dephosphorylation of the 20 000-dalton light chains were increased by interaction of myosin with anti-S2 antibody. Limited proteolysis of myosin was used as a conformational probe. Interaction of anti-S2 antibody with 10S myosin increased the extent of cleavage at the S1-S2 junction. Proteolysis of 6S myosin was rapid and was not influenced by anti-S2 antibody. Our interpretation of these results is that interaction of the anti-S2 antibodies with myosin alters the conformation in the S2 region and this in turn modifies some of the properties of myosin. This is consistent with the hypothesis that the S2 region of smooth muscle myosin is a determinant oif its biological properties.

Original languageEnglish (US)
Pages (from-to)5567-5572
Number of pages6
JournalBiochemistry
Volume28
Issue number13
StatePublished - 1989

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Smooth Muscle Myosins
Myosins
Monoclonal Antibodies
Anti-Idiotypic Antibodies
Antibodies
Proteolysis
Ca(2+) Mg(2+)-ATPase
Immunoglobulin M
Myosin Subfragments
Light
Phosphorylation
Magnesium Chloride
Ionic strength

ASJC Scopus subject areas

  • Biochemistry

Cite this

Ito, M., Pierce, P. R., Allen, R. E., & Hartshorne, D. J. (1989). Effect of monoclonal antibodies on the properties of smooth muscle myosin. Biochemistry, 28(13), 5567-5572.

Effect of monoclonal antibodies on the properties of smooth muscle myosin. / Ito, Masaaki; Pierce, Paul R.; Allen, Ronald E; Hartshorne, David J.

In: Biochemistry, Vol. 28, No. 13, 1989, p. 5567-5572.

Research output: Contribution to journalArticle

Ito, M, Pierce, PR, Allen, RE & Hartshorne, DJ 1989, 'Effect of monoclonal antibodies on the properties of smooth muscle myosin', Biochemistry, vol. 28, no. 13, pp. 5567-5572.
Ito, Masaaki ; Pierce, Paul R. ; Allen, Ronald E ; Hartshorne, David J. / Effect of monoclonal antibodies on the properties of smooth muscle myosin. In: Biochemistry. 1989 ; Vol. 28, No. 13. pp. 5567-5572.
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