A composite approach towards a complete model of the myosin rod
- Univ. of Wisconsin, Madison, WI (United States)
Sarcomeric myosins have the remarkable ability to form regular bipolar thick filaments that, together with actin thin filaments, constitute the fundamental contractile unit of skeletal and cardiac muscle. This has been established for over 50 years and yet a molecular model for the thick filament has not been attained. In part this is due to the lack of a detailed molecular model for the coiled–coil that constitutes the myosin rod. The ability to self–assemble resides in the C–terminal section of myosin known as light meromyosin (LMM) which exhibits strong salt–dependent aggregation that has inhibited structural studies. Here we evaluate the feasibility of generating a complete model for the myosin rod by combining overlapping structures of five sections of coiled–coil covering 164 amino acid residues which constitute 20% of LMM. Each section contains ~7–9 heptads of myosin. The problem of aggregation was overcome by incorporating the globular folding domains, Gp7 and Xrcc4 which enhance crystallization. The effect of these domains on the stability and conformation of the myosin rod was examined through biophysical studies and overlapping structures. In addition, a computational approach was developed to combine the sections into a contiguous model. The structures were aligned, trimmed to form a contiguous model, and simulated for >700 ns to remove the discontinuities and achieve an equilibrated conformation that represents the native state. As a result, this experimental and computational strategy lays the foundation for building a model for the entire myosin rod.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- NIH; NSF; USDOE Office of Energy Research (ER)
- Grant/Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 1234748
- Journal Information:
- Proteins, Journal Name: Proteins Journal Issue: 1 Vol. 84; ISSN 0887-3585
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
Family-specific Kinesin Structures Reveal Neck-linker Length Based on Initiation of the Coiled-coil
|
journal | July 2016 |
Similar Records
Skip residues modulate the structural properties of the myosin rod and guide thick filament assembly
Alternative S2 Hinge Regions of the Myosin Rod Affect Myofibrillar Structure and Myosin Kinetics
Design considerations in coiled-coil fusion constructs for the structural determination of a problematic region of the human cardiac myosin rod
Journal Article
·
Sun Jul 05 20:00:00 EDT 2015
· Proceedings of the National Academy of Sciences of the United States of America
·
OSTI ID:1213724
Alternative S2 Hinge Regions of the Myosin Rod Affect Myofibrillar Structure and Myosin Kinetics
Journal Article
·
Wed Jul 01 00:00:00 EDT 2009
· Biophys. J.
·
OSTI ID:1005716
Design considerations in coiled-coil fusion constructs for the structural determination of a problematic region of the human cardiac myosin rod
Journal Article
·
Thu Nov 30 23:00:00 EST 2017
· Journal of Structural Biology
·
OSTI ID:1418060