MPC2

MPC2 (PF3D7_1470400) is a mitochondrial pyruvate carrier protein in Plasmodium falciparum that contributes to the import of glycolytic pyruvate across the mitochondrial inner membrane for downstream acetyl-CoA synthesis (PMID:40398604). Genetic knockout of MPC2, alone or in combination with PfMPC1, causes only minor growth defects in asexual blood-stage parasites despite a substantial reduction in glucose-derived isotopic labeling into acetyl-CoA, establishing that MPC2 participates in mitochondrial pyruvate import but is functionally dispensable because of redundant carboxylic acid transport routes attributed to DTC and YHM2 (PMID:40398604). Beyond this metabolic role in pyruvate import and the demonstration of transporter redundancy, no further mechanistic detail—including biochemical transport activity, structural features, or interaction partners of MPC2 itself—has been characterized in the available corpus.

1. 2024 Medium

   It was unknown whether MPC2 was required for mitochondrial pyruvate import in blood-stage P. falciparum; knockout combined with isotopic tracing showed MPC2 contributes to pyruvate-derived acetyl-CoA synthesis yet is dispensable, establishing functional redundancy with other carboxylic acid transporters.

   Evidence Genetic knockout of MPC2 (alone and with PfMPC1) with glucose-derived isotopic metabolite tracing by HPLC-MS metabolomics (preprint)

   PMID:39651245

   Open questions at the time

   • Direct biochemical demonstration of pyruvate transport by MPC2 not shown
   • Individual contributions of DTC and YHM2 to the redundant route not resolved
   • No structural or interaction data for MPC2
2. 2025 Medium

   The peer-reviewed study confirmed that MPC2 contributes to mitochondrial pyruvate import and downstream acetyl-CoA synthesis but is dispensable in asexual blood-stage parasites due to redundant carbon import routes.

   Evidence Genetic knockout combined with isotopic metabolite tracing via HPLC-MS metabolomics

   PMID:40398604

   Open questions at the time

   • Whether MPC2 is required in non-asexual stages (e.g. gametocytes, liver stage) not tested
   • No reconstituted transport assay defining MPC2 substrate specificity or kinetics
   • Molecular basis of redundancy with DTC/YHM2 not mechanistically dissected

• Whether MPC2 acts as a direct pyruvate transporter versus a component of a larger carrier complex, its interaction with PfMPC1, and its stage-specific essentiality remain unresolved.
• No direct biochemical transport assay for MPC2
• MPC2-PfMPC1 physical complex not demonstrated in the corpus
• Localization and topology of MPC2 not experimentally established here