PF3D7_0718000

PF3D7_0718000 is a putative dynein heavy chain of P. falciparum whose direct molecular characterization in this species is limited; the corpus identifies it as a target of oxidative lipid peroxidation, forming 4-HNE conjugates at defined sites in response to endoperoxide (plakortin)-induced oxidative stress (PMID:26459031). The functional consequence of this modification on the protein's activity has not been characterized in the available corpus. In P. yoelii, a putative dynein heavy chain (DHC3) that may correspond to this protein localizes to subpellicular microtubules and drives Rab11A/Rab11B-labeled cargo transport required for apical organelle assembly, ookinete morphogenesis, gliding, and mosquito infection (PMID:39366980); whether PF3D7_0718000 is the direct ortholog of DHC3 and shares this role has not been established for the P. falciparum protein itself.

1. 2015 Low

   To ask whether the P. falciparum dynein heavy chain-like protein is a molecular target of antimalarial oxidative stress, the protein was shown to form covalent 4-HNE lipid-peroxidation adducts at defined sites after plakortin treatment, establishing it as a modified target during endoperoxide-induced oxidative damage.

   Evidence Mass spectrometry identification of 4-HNE protein adducts after plakortin treatment in P. falciparum

   PMID:26459031

   Open questions at the time

   • Single method (MS adduct identification) with no functional validation of the modification's effect on dynein activity
   • No demonstration that adduct formation alters motility, cargo transport, or parasite viability
   • Does not establish the protein's normal cellular function in P. falciparum
2. 2024 Medium

   To determine the cellular role of a putative dynein heavy chain in Plasmodium morphogenesis, the P. yoelii ortholog DHC3 was shown to localize to subpellicular microtubules and to transport Rab11A/Rab11B-labeled cargo required for apical organelle formation and ookinete development, framing this dynein as a microtubule motor for polarized intracellular transport.

   Evidence Gene disruption, live imaging/localization, and co-immunoprecipitation of Rab11A/Rab11B with DHC3 in P. yoelii ookinetes

   PMID:39366980

   Open questions at the time

   • Demonstrated in P. yoelii DHC3, not in PF3D7_0718000; orthology to the P. falciparum protein is not established
   • Direct microtubule-based motor activity not reconstituted biochemically
   • Whether PF3D7_0718000 performs the same transport function in P. falciparum is untested

• Whether PF3D7_0718000 itself functions as a subpellicular microtubule dynein motor in P. falciparum, and whether its 4-HNE modification alters that activity, remains unresolved.
• No direct localization or functional assay of PF3D7_0718000 in P. falciparum
• Ortholog relationship between PF3D7_0718000 and P. yoelii DHC3 not confirmed
• No link established between the 4-HNE adduction and any motor or transport phenotype