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Recent advances in imaging technologies have revealed that vesicle transport and the organization of organelles within the endomembrane pathway require a highly dynamic actin cytoskeleton. These dynamics in turn rely on the activity of myosin F (MyoF), a molecular motor unique to alveolates. The defining characteristic of this molecular motor is a WD40 \u03b2-propeller domain, exclusively found in this class of myosin. To understand the mechanism by which MyoF controls the dynamics and organization of actin, we studied the biophysical properties of the purified motor in vitro. A MyoF construct lacking its WD40 tail domain (MyoF-Motor) is dimeric and can bind and translocate actin in an in vitro motility assay. Single-molecule studies show that the dimeric construct is non-processive; however, small ensembles move inefficiently on single filaments of skeletal actin. In contrast, single molecules of the full-length motor move processively on Toxoplasma actin and jasplakinolide-stabilized skeletal actin bundles. Electron microscopy of negatively stained images of MyoF and quantitative size exclusion chromatography show that the WD40 domain oligomerizes to form a complex containing multiple dimeric molecules, which provides an explanation for why the full-length motor is processive compared to the dimeric MyoF-Motor construct. Finally, we show that MyoF binds microtubules through its WD40 domain and can slide actin filaments relative to microtubules. We propose a model whereby MyoF oligomers drive actin dynamics by translocating filaments relative to the cytoskeleton of the parasite. These molecular features provide new insight into how MyoF functions in the cell to regulate actin organization during vesicle transport.<\/jats:p>","DOI":"10.1242\/jcs.264520","type":"journal-article","created":{"date-parts":[[2026,4,17]],"date-time":"2026-04-17T10:42:01Z","timestamp":1776422521000},"source":"Crossref","is-referenced-by-count":2,"title":["Molecular features of myosin F adapted for driving actin flows in\n                    <i>Toxoplasma gondii<\/i>"],"prefix":"10.1242","volume":"139","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8584-5007","authenticated-orcid":false,"given":"Thomas E.","family":"Sladewski","sequence":"first","affiliation":[{"name":"University of Connecticut Department of Molecular and Cell Biology , , Storrs, CT 06269 ,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7838-3617","authenticated-orcid":false,"given":"Aoife T.","family":"Heaslip","sequence":"additional","affiliation":[{"name":"University of Connecticut Department of Molecular and Cell Biology , , Storrs, CT 06269 ,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"237","published-online":{"date-parts":[[2026,4,17]]},"reference":[{"key":"2026041706415760500_JCS264520C69","doi-asserted-by":"publisher","first-page":"493","DOI":"10.1038\/s41586-024-07487-w","article-title":"Accurate structure prediction of biomolecular interactions with AlphaFold 3","volume":"630","author":"Abramson","year":"2024","journal-title":"Nature"},{"key":"2026041706415760500_JCS264520C1","doi-asserted-by":"publisher","first-page":"D808","DOI":"10.1093\/nar\/gkad1003","article-title":"VEuPathDB: the eukaryotic pathogen, vector and host bioinformatics resource center in 2023","volume":"52","author":"Alvarez-Jarreta","year":"2024","journal-title":"Nucleic Acids Res."},{"key":"2026041706415760500_JCS264520C2","doi-asserted-by":"publisher","first-page":"225","DOI":"10.1046\/j.1365-2443.2001.00416.x","article-title":"Coronin forms a stable dimer through its C-terminal coiled coil region: an implicated role in its localization to cell periphery","volume":"6","author":"Asano","year":"2001","journal-title":"Genes Cells"},{"key":"2026041706415760500_JCS264520C3","doi-asserted-by":"publisher","first-page":"e3002809","DOI":"10.1371\/journal.pbio.3002809","article-title":"Alveolin proteins in the Toxoplasma inner membrane complex form a highly interconnected structure that maintains parasite shape and replication","volume":"22","author":"Back","year":"2024","journal-title":"PLoS Biol."},{"key":"2026041706415760500_JCS264520C4","doi-asserted-by":"publisher","first-page":"27556","DOI":"10.1074\/jbc.M112.381301","article-title":"Cloning, expression, and characterization of a novel molecular motor, Leishmania myosin-XXI","volume":"287","author":"Batters","year":"2012","journal-title":"J. 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