Division of Cell Biology and Imaging, Department of Radiology; Craig Lab
Amino Acids, Peptides, and Proteins | Biophysics | Cell Biology | Cellular and Molecular Physiology | Musculoskeletal System
The thick (myosin-containing) filaments of vertebrate skeletal muscle are arranged in a hexagonal lattice, interleaved with an array of thin (actin-containing) filaments with which they interact to produce contraction. X-ray diffraction and EM have shown that there are two types of thick filament lattice. In the simple lattice, all filaments have the same orientation about their long axis, while in the superlattice, nearest neighbors have rotations differing by 0 degrees or 60 degrees . Tetrapods (amphibians, reptiles, birds, and mammals) typically have only a superlattice, while the simple lattice is confined to fish. We have performed x-ray diffraction and electron microscopy of the soleus (SOL) and extensor digitorum longus (EDL) muscles of the rat and found that while the EDL has a superlattice as expected, the SOL has a simple lattice. The EDL and SOL of the rat are unusual in being essentially pure fast and slow muscles, respectively. The mixed fiber content of most tetrapod muscles and/or lattice disorder may explain why the simple lattice has not been apparent in these vertebrates before. This is supported by only weak simple lattice diffraction in the x-ray pattern of mouse SOL, which has a greater mix of fiber types than rat SOL. We conclude that the simple lattice might be common in tetrapods. The correlation between fiber type and filament lattice arrangement suggests that the lattice arrangement may contribute to the functional properties of a muscle.
Biophysics, Contraction and Cell Motility
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DOI of Published Version
J Gen Physiol. 2019 Dec 2;151(12):1404-1412. doi: 10.1085/jgp.201912460. Epub 2019 Nov 7. Link to article on publisher's site
The Journal of general physiology
Ma W, Lee K, Yang S, Irving TC, Craig R. (2019). Lattice arrangement of myosin filaments correlates with fiber type in rat skeletal muscle. Radiology Publications. https://doi.org/10.1085/jgp.201912460. Retrieved from https://escholarship.umassmed.edu/radiology_pubs/510
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.