Structure and flexibility of the tropomyosin overlap junction

•Head-to-tail linkage is required for tropomyosin cable formation on F-actin.•Molecular dynamics of tropomyosin overlap domains were carried out.•N- to C-terminal coiled-coils face each other at an orthogonal angle.•The bending angle of the overlap domain and the rest of the molecule are comparable....

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Published inBiochemical and biophysical research communications Vol. 446; no. 1; pp. 304 - 308
Main Authors Li, Xiaochuan Edward, Orzechowski, Marek, Lehman, William, Fischer, Stefan
Format Journal Article
LanguageEnglish
Published United States Elsevier Inc 28.03.2014
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Abstract •Head-to-tail linkage is required for tropomyosin cable formation on F-actin.•Molecular dynamics of tropomyosin overlap domains were carried out.•N- to C-terminal coiled-coils face each other at an orthogonal angle.•The bending angle of the overlap domain and the rest of the molecule are comparable.•This curvature ensures tropomyosin assembly as an uninterrupted cable on F-actin. To be effective as a gatekeeper regulating the access of binding proteins to the actin filament, adjacent tropomyosin molecules associate head-to-tail to form a continuous super-helical cable running along the filament surface. Chimeric head-to-tail structures have been solved by NMR and X-ray crystallography for N- and C-terminal segments of smooth and striated muscle tropomyosin spliced onto non-native coiled-coil forming peptides. The resulting 4-helix complexes have a tight coiled-coil N-terminus inserted into a separated pair of C-terminal helices, with some helical unfolding of the terminal chains in the striated muscle peptides. These overlap complexes are distinctly curved, much more so than elsewhere along the superhelical tropomyosin cable. To verify whether the non-native protein adducts (needed to stabilize the coiled-coil chimeras) perturb the overlap, we carried out Molecular Dynamics simulations of head-to-tail structures having only native tropomyosin sequences. We observe that the splayed chains all refold and become helical. Significantly, the curvature of both the smooth and the striated muscle overlap domain is reduced and becomes comparable to that of the rest of the tropomyosin cable. Moreover, the measured flexibility across the junction is small. This and the reduced curvature ensure that the super-helical cable matches the contours of F-actin without manifesting localized kinking and excessive flexibility, thus enabling the high degree of cooperativity in the regulation of myosin accessibility to actin filaments.
AbstractList To be effective as a gatekeeper regulating the access of binding proteins to the actin filament, adjacent tropomyosin molecules associate head-to-tail to form a continuous super-helical cable running along the filament surface. Chimeric head-to-tail structures have been solved by NMR and X-ray crystallography for N- and C-terminal segments of smooth and striated muscle tropomyosin spliced onto non-native coiled-coil forming peptides. The resulting 4-helix complexes have a tight coiled-coil N-terminus inserted into a separated pair of C-terminal helices, with some helical unfolding of the terminal chains in the striated muscle peptides. These overlap complexes are distinctly curved, much more so than elsewhere along the superhelical tropomyosin cable. To verify whether the non-native protein adducts (needed to stabilize the coiled-coil chimeras) perturb the overlap, we carried out Molecular Dynamics simulations of head-to-tail structures having only native tropomyosin sequences We observe that the splayed chains all refold and become helical. Significantly, the curvature of both the smooth and the striated muscle overlap domain is reduced and becomes comparable to that of the rest of the tropomyosin cable. Moreover, the measured flexibility across the junction is small. This and the reduced curvature ensure that the super-helical cable matches the contours of F-actin without manifesting localized kinking and excessive flexibility, thus enabling the high degree of cooperativity in the regulation of myosin accessibility to actin filaments.
•Head-to-tail linkage is required for tropomyosin cable formation on F-actin.•Molecular dynamics of tropomyosin overlap domains were carried out.•N- to C-terminal coiled-coils face each other at an orthogonal angle.•The bending angle of the overlap domain and the rest of the molecule are comparable.•This curvature ensures tropomyosin assembly as an uninterrupted cable on F-actin. To be effective as a gatekeeper regulating the access of binding proteins to the actin filament, adjacent tropomyosin molecules associate head-to-tail to form a continuous super-helical cable running along the filament surface. Chimeric head-to-tail structures have been solved by NMR and X-ray crystallography for N- and C-terminal segments of smooth and striated muscle tropomyosin spliced onto non-native coiled-coil forming peptides. The resulting 4-helix complexes have a tight coiled-coil N-terminus inserted into a separated pair of C-terminal helices, with some helical unfolding of the terminal chains in the striated muscle peptides. These overlap complexes are distinctly curved, much more so than elsewhere along the superhelical tropomyosin cable. To verify whether the non-native protein adducts (needed to stabilize the coiled-coil chimeras) perturb the overlap, we carried out Molecular Dynamics simulations of head-to-tail structures having only native tropomyosin sequences. We observe that the splayed chains all refold and become helical. Significantly, the curvature of both the smooth and the striated muscle overlap domain is reduced and becomes comparable to that of the rest of the tropomyosin cable. Moreover, the measured flexibility across the junction is small. This and the reduced curvature ensure that the super-helical cable matches the contours of F-actin without manifesting localized kinking and excessive flexibility, thus enabling the high degree of cooperativity in the regulation of myosin accessibility to actin filaments.
Author Lehman, William
Li, Xiaochuan Edward
Orzechowski, Marek
Fischer, Stefan
AuthorAffiliation b Computational Biochemistry Group, Interdisciplinary Center for Scientific Computing (IWR), University of Heidelberg, Im Neuenheimer Feld 368, Heidelberg D69120 Germany
a Department of Physiology and Biophysics, Boston University School of Medicine, 72 East Concord Street, Boston, MA 02118, USA
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  surname: Lehman
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  email: stefan.fischer@iwr.uni-heidelberg.de
  organization: Computational Biochemistry Group, Interdisciplinary Center for Scientific Computing (IWR), University of Heidelberg, Im Neuenheimer Feld 368, Heidelberg D69120, Germany
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Keywords Thin filaments
Coiled-coil
Molecular Dynamics
Muscle regulation
Actin
Language English
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Snippet •Head-to-tail linkage is required for tropomyosin cable formation on F-actin.•Molecular dynamics of tropomyosin overlap domains were carried out.•N- to...
To be effective as a gatekeeper regulating the access of binding proteins to the actin filament, adjacent tropomyosin molecules associate head-to-tail to form...
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StartPage 304
SubjectTerms Actin
Actins - chemistry
Animals
Coiled-coil
Crystallography, X-Ray
Humans
Models, Molecular
Molecular Dynamics
Molecular Dynamics Simulation
Muscle regulation
Muscle, Skeletal - chemistry
Muscle, Smooth - chemistry
Nuclear Magnetic Resonance, Biomolecular
Protein Structure, Secondary
Protein Structure, Tertiary
Recombinant Fusion Proteins - chemistry
Thin filaments
Tropomyosin - chemistry
Title Structure and flexibility of the tropomyosin overlap junction
URI https://dx.doi.org/10.1016/j.bbrc.2014.02.097
https://www.ncbi.nlm.nih.gov/pubmed/24607906
https://search.proquest.com/docview/1514435951
https://pubmed.ncbi.nlm.nih.gov/PMC4003899
Volume 446
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