Journal of Muscle Research & Cell Motility

, Volume 26, Issue 6–8, pp 455–460

Twitchin as a regulator of catch contraction in molluscan smooth muscle

  • Daisuke Funabara
  • Satoshi Kanoh
  • Marion J. Siegman
  • Thomas M. Butler
  • David J. Hartshorne
  • Shugo Watabe
Article

DOI: 10.1007/s10974-005-9029-2

Cite this article as:
Funabara, D., Kanoh, S., Siegman, M.J. et al. J Muscle Res Cell Motil (2005) 26: 455. doi:10.1007/s10974-005-9029-2

Abstract

Molluscan catch muscle can maintain tension for a long time with little energy consumption. This unique phenomenon is regulated by phosphorylation and dephosphorylation of twitchin, a member of the titin/connectin family. The catch state is induced by a decrease of intracellular Ca2+ after the active contraction and is terminated by the phosphorylation of twitchin by the cAMP-dependent protein kinase (PKA). Twitchin, from the well-known catch muscle, the anterior byssus retractor muscle (ABRM) of the mollusc Mytilus, incorporates three phosphates into two major sites D1 and D2, and some minor sites. Dephosphorylation is required for re-entering the catch state. Myosin, actin and twitchin are essential players in the mechanism responsible for catch during which force is maintained while myosin cross-bridge cycling is very slow. Dephosphorylation of twitchin allows it to bind to F-actin, whereas phosphorylation decreases the affinity of the two proteins. Twitchin has been also been shown to be a thick filament-binding protein. These findings raise the possibility that twitchin regulates the myosin cross-bridge cycle and force output by interacting with both actin and myosin resulting in a structure that connects thick and thin filaments in a phosphorylation-dependent manner.

Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • Daisuke Funabara
    • 1
  • Satoshi Kanoh
    • 1
  • Marion J. Siegman
    • 2
  • Thomas M. Butler
    • 2
  • David J. Hartshorne
    • 3
  • Shugo Watabe
    • 4
  1. 1.Faculty of Bioresources Mie UniversityTsuJapan
  2. 2.Department of PhysiologyJefferson Medical CollegePennsylvaniaUSA
  3. 3.Muscle Biology GroupUniversity of ArizonaTucson, ArizonaUSA
  4. 4.Graduate School of Agricultural and Life SciencesThe University of TokyoBunkyo, TokyoJapan

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