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Actin depolymerization under force is governed by lysine 113:glutamic acid 195-mediated catch-slip bonds
- Source :
- Proceedings of the National Academy of Sciences. 110:5022-5027
- Publication Year :
- 2013
- Publisher :
- Proceedings of the National Academy of Sciences, 2013.
-
Abstract
- As a key element in the cytoskeleton, actin filaments are highly dynamic structures that constantly sustain forces. However, the fundamental question of how force regulates actin dynamics is unclear. Using atomic force microscopy force-clamp experiments, we show that tensile force regulates G-actin/G-actin and G-actin/F-actin dissociation kinetics by prolonging bond lifetimes (catch bonds) at a low force range and by shortening bond lifetimes (slip bonds) beyond a threshold. Steered molecular dynamics simulations reveal force-induced formation of new interactions that include a lysine 113(K113):glutamic acid 195 (E195) salt bridge between actin subunits, thus suggesting a molecular basis for actin catch-slip bonds. This structural mechanism is supported by the suppression of the catch bonds by the single-residue replacements K113 to serine (K113S) and E195 to serine (E195S) on yeast actin. These results demonstrate and provide a structural explanation for actin catch-slip bonds, which may provide a mechanoregulatory mechanism to control cell functions by regulating the depolymerization kinetics of force-bearing actin filaments throughout the cytoskeleton.
- Subjects :
- Saccharomyces cerevisiae Proteins
Kinetics
Mutation, Missense
Arp2/3 complex
Saccharomyces cerevisiae
macromolecular substances
Microscopy, Atomic Force
Avian Proteins
Molecular dynamics
Animals
Humans
Cytoskeleton
Actin
Multidisciplinary
biology
Depolymerization
Chemistry
Actin remodeling
Biological Sciences
Actin cytoskeleton
Actins
Actin Cytoskeleton
Crystallography
Amino Acid Substitution
biology.protein
Rabbits
Chickens
Subjects
Details
- ISSN :
- 10916490 and 00278424
- Volume :
- 110
- Database :
- OpenAIRE
- Journal :
- Proceedings of the National Academy of Sciences
- Accession number :
- edsair.doi.dedup.....00f4fa5666f817e36a42da6c0a0ab70b