title: Plasmodium sporozoite motility is modulated by the turnover of discrete adhesion sites.
abstract: Sporozoites are the highly motile stages of the malaria parasite injected into the host's skin during a mosquito bite. In order to navigate inside of the host, sporozoites rely on actin-dependent gliding motility. Although the major components of the gliding machinery are known, the spatiotemporal dynamics of the proteins and the underlying mechanism powering forward locomotion remain unclear. Here, we show that sporozoite motility is characterized by a continuous sequence of stick-and-slip phases. Reflection interference contrast and traction force microscopy identified the repeated turnover of discrete adhesion sites as the underlying mechanism of this substrate-dependent type of motility. Transient forces correlated with the formation and rupture of distinct substrate contact sites and were dependent on actin dynamics. Further, we show that the essential sporozoite surface protein TRAP is critical for the regulated formation and rupture of adhesion sites but is dispensable for retrograde capping.
authors.affiliation: Parasitology, Department of Infectious Diseases, University of Heidelberg Medical School, Im Neuenheimer Feld 324, University of Heidelberg, 69120 Heidelberg, Germany.
authors.forename: Sylvia
authors.initials: S
authors.lastname: Münter
authors.forename: Benedikt
authors.initials: B
authors.lastname: Sabass
authors.forename: Christine
authors.initials: C
authors.lastname: Selhuber-Unkel
authors.forename: Mikhail
authors.initials: M
authors.lastname: Kudryashev
authors.forename: Stephan
authors.initials: S
authors.lastname: Hegge
authors.forename: Ulrike
authors.initials: U
authors.lastname: Engel
authors.forename: Joachim P
authors.initials: JP
authors.lastname: Spatz
authors.forename: Kai
authors.initials: K
authors.lastname: Matuschewski
authors.forename: Ulrich S
authors.initials: US
authors.lastname: Schwarz
authors.forename: Friedrich
authors.initials: F
authors.lastname: Frischknecht
mesh_terms: D000199:Actins / Q000378:metabolism; D000818:Animals; D000852:Anopheles; D002448:Cell Adhesion; D015815:Cell Adhesion Molecules / Q000235:genetics / Q000378:metabolism; D002460:Cell Line; D002465:Cell Movement; D006801:Humans; D008288:Malaria / Q000378:metabolism / Q000469:parasitology*; D010961:Plasmodium / Q000166:cytology / Q000235:genetics / Q000254:growth & development / Q000502:physiology*; D015800:Protozoan Proteins / Q000235:genetics / Q000378:metabolism; D034101:Sporozoites / Q000166:cytology / Q000502:physiology*
chemical_list: D000199:Actins; D015815:Cell Adhesion Molecules; D015800:Protozoan Proteins