ArticleProceedings of the National Academy of Sciences of the United States of America1998
Filament structure as an essential factor for regulation of Dictyostelium myosin by regulatory light chain phosphorylation.
Article in Proceedings of the National Academy of Sciences of the United States of America, 1998. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
8 citing papers in PubMed, 28 citations in OpenAlex.
- Nonmuscle myosin 2 without an assembly competence domain can incorporate into established filaments in cells.Molecular biology of the cell · 2025Article
- SuggestingCells · 2024Article
- Interacting-heads motif has been conserved as a mechanism of myosin II inhibition since before the origin of animals.Proceedings of the National Academy of Sciences of the United States of America · 2018Article
- Life without double-headed non-muscle myosin II motor proteins.Frontiers in chemistry · 2014Review
- Regulation of the filament structure and assembly of Acanthamoeba myosin II by phosphorylation of serines in the heavy-chain nonhelical tailpiece.Proceedings of the National Academy of Sciences of the United States of America · 2013Article
- Myosin II is essential for the spatiotemporal organization of traction forces during cell motility.Molecular biology of the cell · 2010Article
- Unique charge distribution in surface loops confers high velocity on the fast motor protein Chara myosin.Proceedings of the National Academy of Sciences of the United States of America · 2009Article
- Chimeras of Dictyostelium myosin II head and neck domains with Acanthamoeba or chicken smooth muscle myosin II tail domain have greatly increased and unregulated actin-dependent MgATPase activity.Proceedings of the National Academy of Sciences of the United States of America · 2000Article
Corrections and comments
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Authors and funding
6 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Phosphorylation of the regulatory light chain (RLC) activates the actin-dependent ATPase activity of Dictyostelium myosin II. To elucidate this regulatory mechanism, we characterized two mutant myosins, MyDeltaC1225 and MyDeltaC1528, which are truncated at Ala-1224 and Ser-1527, respectively. These mutant myosins do not contain the C-terminal assembly domain and thus are unable to form filaments. Their activities were only weakly regulated by RLC phosphorylation, suggesting that, unlike smooth muscle myosin, efficient regulation of Dictyostelium myosin II requires filament assembly. Consistent with this hypothesis, wild-type myosin progressively lost the regulation as its concentration in the assay mixture was decreased. Dephosphorylated RLC did not inhibit the activity when the concentration of myosin in the reaction mixture was very low. Furthermore, 3xAsp myosin, which does not assemble efficiently due to point mutations in the tail, also was less well regulated than the wild-type. We conclude that the activity in the monomer state is exempt from inhibition by the dephosphorylated RLC and that the complete regulatory switch is formed only in the filament structure. Interestingly, a chimeric myosin composed of Dictyostelium heavy meromyosin fused to chicken skeletal light meromyosin was not well regulated by RLC phosphorylation. This suggests that, in addition to filament assembly, some specific feature of the filament structure is required for efficient regulation.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.