MPC1

MPC1 (PF3D7_1340800) is a mitochondrial pyruvate carrier that, together with PfMPC2, constitutes the predominant route for importing glucose-derived pyruvate into the P. falciparum mitochondrion for acetyl-CoA synthesis (PMID:40398604). Genetic knockout of PfMPC1, alone or combined with PfMPC2, substantially reduces glucose-derived isotopic labeling of acetyl-CoA yet causes only minor asexual blood-stage growth defects, establishing that PfMPC1 is not individually essential and that redundant carbon-import routes compensate for its loss (PMID:40398604). Epistatic knockout combining PfMPC1/2 with the carboxylic acid transporters DTC and YHM2 does not further diminish glucose carbon incorporation into acetyl-CoA but sharply reduces glutamine-derived labeling of TCA cycle metabolites, defining a division of labor in which PfMPC1/2 handle glucose-derived pyruvate import while DTC and YHM2 import glutamine derivatives (PMID:40398604). Beyond this genetic and metabolic characterization of its transport role in blood-stage parasites, no further structural or biochemical detail for PfMPC1 has been characterized in the available corpus.

1. 2025 Medium

   It was unknown whether PfMPC1 is required for pyruvate import and blood-stage growth; knockout showed it contributes to glucose-derived acetyl-CoA synthesis but is genetically dispensable, establishing functional redundancy in mitochondrial carbon import.

   Evidence Genetic knockout of PfMPC1 alone and with PfMPC2, plus HPLC-MS isotopic metabolite tracing in asexual blood-stage parasites

   PMID:40398604

   Open questions at the time

   • Direct biochemical demonstration of pyruvate transport by PfMPC1 (e.g. reconstitution) is not shown
   • The identity of the redundant carbon-import routes compensating for PfMPC1 loss is not fully resolved
   • Role in non-blood-stage or transmission stages not addressed
2. 2025 Medium

   To distinguish glucose- versus glutamine-derived carbon routes, quadruple knockout established that PfMPC1/2 are the main glucose-derived pyruvate importers while DTC and YHM2 dominate glutamine-derivative import, partitioning mitochondrial substrate supply.

   Evidence Quadruple genetic knockout (PfMPC1, PfMPC2, DTC, YHM2) with glucose and glutamine isotopic tracers analyzed by HPLC-MS

   PMID:40398604

   Open questions at the time

   • Individual contribution of PfMPC1 versus PfMPC2 within the pair not separately quantified in the quadruple background
   • Whether PfMPC1 physically forms a heterocomplex with PfMPC2 is not demonstrated
   • Direct transport substrate specificity not measured biochemically

• Whether PfMPC1 assembles into a defined carrier complex, its structure, and its role beyond asexual blood stages remain unresolved.
• No structural model or biochemical reconstitution of PfMPC1 transport activity
• Direct evidence of a physical PfMPC1-PfMPC2 complex not established in the corpus
• Stage-specific requirement (gametocyte/mosquito stages) uncharacterized