PF3D7_1464900

PF3D7_1464900 is a putative ATP-dependent zinc metalloprotease of the FtsH family in Plasmodium falciparum, associated with the parasite's organellar membrane systems. It was recovered in the apicoplast proteome by proximity biotinylation, placing it within that organelle (PMID:30212465), and it co-purifies with the stomatin-like protein STOML, with the complex localizing to distinct puncta at branching points and endings of the asexual blood-stage mitochondrial network in an arrangement modeled as analogous to the bacterial HflK/C vault-like structure around FtsH hexamers (PMID:41662436). Beyond this organellar localization and the STOML association (PMID:30212465, PMID:41662436), the enzymatic substrates, catalytic activity, and functional contribution of PF3D7_1464900 to blood-stage development have not been characterized in the available corpus.

1. 2018 Medium

   Establishing where this putative protease resides was the first step; proteomic mapping placed PF3D7_1464900 in the apicoplast, giving it an organellar context.

   Evidence Proximity biotinylation (BioID) proteomics with machine-learning classification of the apicoplast proteome

   PMID:30212465

   Open questions at the time

   • FtsH listed among 346 proteins without individual functional validation
   • No evidence of catalytic activity or substrate
   • Apicoplast assignment not cross-validated against mitochondrial localization
2. 2026 Medium

   Identifying a binding partner and its subcellular distribution addressed whether PF3D7_1464900 acts within a defined complex; pulldowns and imaging linked it to STOML at discrete mitochondrial-network puncta, invoking a bacterial HflK/C-FtsH vault analogy.

   Evidence Co-IP/pulldown of epitope-tagged STOML with mass spectrometry, AlphaFold2 complex modeling, and live imaging of endogenous epitope-tagged proteins

   PMID:41662436

   Open questions at the time

   • Single pulldown without reciprocal Co-IP or in vitro reconstitution of the complex
   • FtsH zinc-metalloprotease activity not biochemically demonstrated
   • Apparent mitochondrial localization here contrasts with the earlier apicoplast assignment; dual/definitive targeting unresolved

• The enzymatic substrates, catalytic activity, and functional requirement of PF3D7_1464900 for parasite development remain unknown.
• No substrate identified for the putative protease
• No genetic knockout/knockdown phenotype established
• Enzymatic zinc-metalloprotease activity not directly measured