PF3D7_1021900

The PHAX domain-containing protein encoded by PF3D7_1021900 has been characterized in the available corpus only through its physical association with GBP2 in Plasmodium berghei blood-stage parasites, where it was recovered as a GBP2 interacting partner by immunoprecipitation-mass spectrometry, implicating it as a candidate exportin-1 adaptor in the parasite mRNA nuclear export pathway (PMID:34604117). Beyond this single interaction, no direct functional, biochemical, or structural characterization of PF3D7_1021900 itself has been reported in the available corpus, and its role is inferred from the biology of the GBP2 complex rather than established for the protein directly.

1. 2021 Low

   To place PF3D7_1021900 in a pathway, its physical partners were unknown; identifying it in a GBP2 pulldown established a candidate link to the mRNA nuclear export machinery.

   Evidence Immunoprecipitation coupled to mass spectrometry of GBP2 in P. berghei blood-stage parasites

   PMID:34604117

   Open questions at the time

   • Single Co-IP/MS in a study focused on GBP2, with no reciprocal pulldown or direct validation of the interaction from the PF3D7_1021900 side
   • No functional evidence that PF3D7_1021900 acts as an exportin-1 adaptor or participates in mRNA export
   • The interaction was shown for the P. berghei ortholog, not directly for PF3D7_1021900 in P. falciparum

• Whether PF3D7_1021900 has any intrinsic activity, direct binding to exportin-1 or RNA, essential function, or a defined subcellular localization remains entirely unestablished.
• No genetic knockout, knockdown, or complementation data for PF3D7_1021900
• No structural model or PHAX-domain function validated for this protein
• No demonstrated role in mRNA export beyond guilt-by-association with GBP2