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© The Rockefeller University Press, 0021-9525/1999/12/1385/ $5.00
The Journal of Cell Biology, Volume 147, Number 7, December 27, 1999 1385-1390

Brief Report

Visualization of Head–Head Interactions in the Inhibited State of Smooth Muscle Myosin

Thomas Wendta, Dianne Taylora, Terri Messierb, Kathleen M. Trybusb, and Kenneth A. Taylora
a Institute of Molecular Biophysics, Florida State University, Tallahassee, Florida 32306
b Department of Molecular Physiology and Biophysics, University of Vermont College of Medicine, Burlington, Vermont 05405

Correspondence to: Kenneth A. Taylor, Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306. Tel:(850) 644-3357 Fax:(850) 561-1406 E-mail:taylor{at}bio.fsu.edu.

The structural basis for the phosphoryla- tion-dependent regulation of smooth muscle myosin ATPase activity was investigated by forming two- dimensional (2-D) crystalline arrays of expressed unphosphorylated and thiophosphorylated smooth muscle heavy meromyosin (HMM) on positively charged lipid monolayers. A comparison of averaged 2-D projections of both forms at 2.3-nm resolution reveals distinct structural differences. In the active, thiophosphorylated form, the two heads of HMM interact intermolecularly with adjacent molecules. In the unphosphorylated or inhibited state, intramolecular interactions position the actin-binding interface of one head onto the converter domain of the second head, thus providing a mechanism whereby the activity of both heads could be inhibited.

Key Words: myosin light chains, phosphorylation, two-dimensional crystalline arrays, myosin regulation, myosin head interactions


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