Probing the structure of F-actin: cross-links constrain atomic models and modify actin dynamics.
Identifieur interne : 002546 ( PubMed/Curation ); précédent : 002545; suivant : 002547Probing the structure of F-actin: cross-links constrain atomic models and modify actin dynamics.
Auteurs : A. Orlova [États-Unis] ; V E Galkin ; M S Vanloock ; E. Kim ; A. Shvetsov ; E. Reisler ; E H EgelmanSource :
- Journal of molecular biology [ 0022-2836 ] ; 2001.
Descripteurs français
- KwdFr :
- Actines (), Actines (génétique), Actines (métabolisme), Algorithmes, Animaux, Conformation des protéines, Deoxyribonuclease I (métabolisme), Disulfures (), Levures (), Microscopie électronique, Modèles moléculaires, Modèles statistiques, Muscles squelettiques (), Mutation, Traitement d'image par ordinateur.
- MESH :
English descriptors
- KwdEn :
- Actins (chemistry), Actins (genetics), Actins (metabolism), Algorithms, Animals, Deoxyribonuclease I (metabolism), Disulfides (chemistry), Image Processing, Computer-Assisted, Microscopy, Electron, Models, Molecular, Models, Statistical, Muscle, Skeletal (chemistry), Mutation, Protein Conformation, Yeasts (chemistry).
- MESH :
- chemical , chemistry : Actins, Disulfides.
- chemical , genetics : Actins.
- chemical , metabolism : Actins, Deoxyribonuclease I.
- chemistry : Muscle, Skeletal, Yeasts.
- Algorithms, Animals, Image Processing, Computer-Assisted, Microscopy, Electron, Models, Molecular, Models, Statistical, Mutation, Protein Conformation.
Abstract
Cross-links between protomers in F-actin can be used as a very sensitive probe of both the dynamics and structure of F-actin. We have characterized filaments formed from a previously described yeast actin Q41C mutant, where disulfide bonds can be formed between the Cys41 that is introduced into subdomain-2 and Cys374 on an adjacent protomer. We find that the distribution of cross-linked n-mers shows no cooperativity and corresponds to a random probability cross-linking reaction. The random distribution suggests that disulfide formation does not cause a significant perturbation of the F-actin structure. Consistent with this lack of perturbation, three-dimensional reconstructions of extensively cross-linked filaments, using a new approach to helical image analysis, show very small structural changes with respect to uncross-linked filaments. This finding is in conflict with refined models but in agreement with the original Holmes et al. model for F-actin. Under conditions where 94 % of the protomers are linked by disulfide bonds, the distribution of filament twist becomes more heterogeneous with respect to control filaments. A molecular model suggests that strain, introduced by the disulfide, is relieved by increasing the twist of the long-pitch actin helices. Disulfide formation makes yeast actin filaments approximately three times less flexible in terms of bending and similar, in this respect, to vertebrate skeletal muscle F-actin. These observations support previous reports that the rigidity of F-actin can be controlled by the position of subdomain-2, and that this region is more flexible in yeast F-actin than in skeletal muscle F-actin.
DOI: 10.1006/jmbi.2001.4945
PubMed: 11545588
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<term>Deoxyribonuclease I (metabolism)</term>
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<front><div type="abstract" xml:lang="en">Cross-links between protomers in F-actin can be used as a very sensitive probe of both the dynamics and structure of F-actin. We have characterized filaments formed from a previously described yeast actin Q41C mutant, where disulfide bonds can be formed between the Cys41 that is introduced into subdomain-2 and Cys374 on an adjacent protomer. We find that the distribution of cross-linked n-mers shows no cooperativity and corresponds to a random probability cross-linking reaction. The random distribution suggests that disulfide formation does not cause a significant perturbation of the F-actin structure. Consistent with this lack of perturbation, three-dimensional reconstructions of extensively cross-linked filaments, using a new approach to helical image analysis, show very small structural changes with respect to uncross-linked filaments. This finding is in conflict with refined models but in agreement with the original Holmes et al. model for F-actin. Under conditions where 94 % of the protomers are linked by disulfide bonds, the distribution of filament twist becomes more heterogeneous with respect to control filaments. A molecular model suggests that strain, introduced by the disulfide, is relieved by increasing the twist of the long-pitch actin helices. Disulfide formation makes yeast actin filaments approximately three times less flexible in terms of bending and similar, in this respect, to vertebrate skeletal muscle F-actin. These observations support previous reports that the rigidity of F-actin can be controlled by the position of subdomain-2, and that this region is more flexible in yeast F-actin than in skeletal muscle F-actin.</div>
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<Abstract><AbstractText>Cross-links between protomers in F-actin can be used as a very sensitive probe of both the dynamics and structure of F-actin. We have characterized filaments formed from a previously described yeast actin Q41C mutant, where disulfide bonds can be formed between the Cys41 that is introduced into subdomain-2 and Cys374 on an adjacent protomer. We find that the distribution of cross-linked n-mers shows no cooperativity and corresponds to a random probability cross-linking reaction. The random distribution suggests that disulfide formation does not cause a significant perturbation of the F-actin structure. Consistent with this lack of perturbation, three-dimensional reconstructions of extensively cross-linked filaments, using a new approach to helical image analysis, show very small structural changes with respect to uncross-linked filaments. This finding is in conflict with refined models but in agreement with the original Holmes et al. model for F-actin. Under conditions where 94 % of the protomers are linked by disulfide bonds, the distribution of filament twist becomes more heterogeneous with respect to control filaments. A molecular model suggests that strain, introduced by the disulfide, is relieved by increasing the twist of the long-pitch actin helices. Disulfide formation makes yeast actin filaments approximately three times less flexible in terms of bending and similar, in this respect, to vertebrate skeletal muscle F-actin. These observations support previous reports that the rigidity of F-actin can be controlled by the position of subdomain-2, and that this region is more flexible in yeast F-actin than in skeletal muscle F-actin.</AbstractText>
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