PF3D7_1224200

PF3D7_1224200 (BRO1/PfBro1) is a BRO1 domain-containing component of the Plasmodium falciparum ESCRT-III machinery that participates in an alternative ESCRT-III recruitment pathway driving extracellular vesicle production and membrane remodeling (PMID:33798247). Working together with PfVps32 and PfVps60, purified recombinant PfBro1 reconstitutes multivesicular body formation and membrane shedding in giant unilamellar vesicle membrane models, and PfBro1 is detected within extracellular vesicles purified from parasitized red blood cell cultures (PMID:33798247). Beyond this single reconstitution and localization study, no further mechanistic detail — including binding partners, recruitment mechanism, or in vivo genetic requirement of PfBro1 itself — has been characterized in the available corpus.

1. 2021 Medium

   It was unknown whether P. falciparum possessed a functional BRO1-associated ESCRT-III pathway capable of remodeling membranes; reconstitution established that PfBro1 acts within an alternative ESCRT-III recruitment route to drive extracellular vesicle biogenesis.

   Evidence in vitro reconstitution with purified recombinant PfBro1 in giant unilamellar vesicles, plus super-resolution microscopy and dot blot detection of PfBro1 in purified EVs, with PfVps60 KO showing redistribution of ESCRT-III components

   PMID:33798247

   Open questions at the time

   • no direct binding partner of PfBro1 identified or reciprocal interaction validated
   • no genetic disruption of PfBro1 itself to establish its requirement for EV production in vivo
   • mechanism by which PfBro1 is recruited to membranes not defined

• How PfBro1 is recruited to sites of membrane remodeling and whether it is essential for extracellular vesicle production during the intraerythrocytic cycle remain open.
• no loss-of-function study targeting PF3D7_1224200 directly
• no structural model of PfBro1 or its membrane-binding interface
• functional role of EVs produced via this pathway during infection not defined