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Titins: Giant Proteins in Charge of Muscle Ultrastructure and Elasticity
Abstract
In addition to thick and thin filaments, vertebrate striated muscle contains a third filament system formed by the giant protein titin. Single titin molecules extend from Z discs to M lines and are longer than 1 micrometer. The titin filament contributes to muscle assembly and resting tension, but more details are not known because of the large size of the protein. The complete complementary DNA sequence of human cardiac titin was determined. The 82-kilobase complementary DNA predicts a 3-megadalton protein composed of 244 copies of immunoglobulin and fibronectin type III (FN3) domains. The architecture of sequences in the A band region of titin suggests why thick filament structure is conserved among vertebrates. In the I band region, comparison of titin sequences from muscles of different passive tension identifies two elements that correlate with tissue stiffness. This suggests that titin may act as two springs in series. The differential expression of the springs provides a molecular explanation for the diversity of sarcomere length and resting tension in vertebrate striated muscles.
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Cites
Saiki, R. K., Scharf, S., Faloona, F., Mullis, K. B., Horn, G. T., Erlich, H. A., & Arnheim, N. (1985) · Science · doi:10.1126/science.2999980 · Cited by 8,956
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Metadata
- Authors
- Labeit, S., & Kolmerer, B.
- Venue
- Science
- Published
- 1995-10-13
- Volume
- 270
- Issue
- 5234
- Pages
- 293-296
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W1977378217
- Cited by
- 1,237
- References
- 1
- FWCI
- 16.82
- Type
- journal article
- Language
- en
- Open access
- closed
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
