Myosin Head Configurations in Resting and Contracting Murine Skeletal Muscle

Ma, Weikang; Gong, Henry; Irving, Thomas

doi:10.3390/ijms19092643

Title: Myosin Head Configurations in Resting and Contracting Murine Skeletal Muscle

Journal Article · Sat Sep 01 00:00:00 EDT 2018 · International Journal of Molecular Sciences (Online)

DOI:https://doi.org/10.3390/ijms19092643· OSTI ID:1471602

Ma, Weikang; Gong, Henry; Irving, Thomas

Transgenic mouse models have been important tools for studying the relationship of genotype to phenotype for human diseases, including those of skeletal muscle. We show that mouse skeletal muscle can produce high quality X-ray diffraction patterns establishing the mouse intact skeletal muscle X-ray preparation as a potentially powerful tool to test structural hypotheses in health and disease. A notable feature of the mouse model system is the presence of residual myosin layer line intensities in contracting mouse muscle patterns. This provides an additional tool, along with the I1,1/I1,0 intensity ratio, for estimating the proportions of active versus relaxed myosin heads under a given set of conditions that can be used to characterize a given physiological condition or mutant muscle type. We also show that analysis of the myosin layer line intensity distribution, including derivation of the myosin head radius, Rm, may be used to study the role of the super-relaxed state in myosin regulation. When the myosin inhibitor blebbistatin is used to inhibit force production, there is a shift towards a highly quasi-helically ordered configuration that is distinct from the normal resting state, indicating there are more than one helically ordered configuration for resting crossbridges.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: National Institutes of Health (NIH)

OSTI ID:: 1471602

Journal Information:: International Journal of Molecular Sciences (Online), Vol. 19, Issue 9; ISSN 1422-0067

Publisher:: MDPI

Country of Publication:: United States

Language:: ENGLISH

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