Titin Gene and Protein Functions in Passive and Active Muscle
2018 | journal article; overview
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- Authors
- Linke, Wolfgang A.
- Abstract
- The thin and thick filaments of muscle sarcomeres are interconnected by the giant protein titin, which is a scaffolding filament, signaling platform, and provider of passive tension and elasticity in myocytes. This review summarizes recent insight into the mechanisms behind how titin gene mutations cause hereditary cardiomyopathy and how titin protein is mechanically active in skeletal and cardiac myocytes. A main theme is the evolving role of titin as a modulator of contraction. Topics include strain-sensing via titin in the sarcomeric A-band as the basis for length-dependent activation, titin elastic recoil and refolding of titin domains as an energy source, and Ca2+-dependent stiffening of titin stretched during eccentric muscle contractions. Findings suggest that titin stiffness is a principal regulator of the contractile behavior of striated muscle. Physiological or pathological changes to titin stiffness therefore affect contractility. Taken together, titin emerges as a linker element between passive and active myocyte properties.
- Issue Date
- 2018
- Journal
- Annual Review of Physiology
- Project
- SFB 1002: Modulatorische Einheiten bei Herzinsuffizienz
SFB 1002 | A08: Translationale und posttranslationale Kontrolle trunkierter Titinproteine in Kardiomyozyten von Patienten mit dilatativer Kardiomyopathie - Working Group
- RG Linke (Kardiovaskuläre Physiologie)
- ISSN
- 0066-4278
- eISSN
- 1545-1585
- Language
- English