PF3D7_0627700

PF3D7_0627700 encodes a putative Plasmodium falciparum transportin, a 1,136 amino acid protein whose sequence contains conserved Ran-GTP and M9 nuclear localization signal binding domains, consistent with a role in the nuclear import of M9-bearing cargo proteins; Southern blot established it as a single-copy gene (PMID:12049453). Beyond this sequence-level and single-copy characterization, the direct functional biology of PF3D7_0627700 has not been characterized in the available corpus: no in vitro import assay, mutagenesis, or cargo identification has been reported for the P. falciparum protein. In the related parasite P. berghei, a transportin was identified as a binding partner of the nuclear poly(A) binding protein NAB2 at the nuclear periphery by IP-MS, placing a transportin within nuclear transport processes in malaria parasites (PMID:34604117).

1. 2002 Medium

   Establishing whether malaria parasites encode a dedicated nuclear import receptor addressed how M9-bearing cargo might reach the parasite nucleus; cloning revealed a single-copy gene with the diagnostic Ran-GTP and M9-NLS binding domains.

   Evidence cDNA cloning, amino acid sequence/domain analysis, and Southern blot in P. falciparum

   PMID:12049453

   Open questions at the time

   • No in vitro import assay demonstrating M9-cargo binding or Ran-GTP-dependent release
   • No mutagenesis confirming domain function
   • No cargo protein identified for the P. falciparum transportin
2. 2021 Low

   To identify physiological partners of a malaria transportin, IP-MS in P. berghei placed a transportin in association with the RNA-binding protein NAB2 at the nuclear periphery, linking transportin to nuclear transport/RNA-associated processes.

   Evidence Immunoprecipitation coupled to mass spectrometry with live-cell fluorescence imaging in P. berghei

   PMID:34604117

   Open questions at the time

   • Single Co-IP/MS without reciprocal pulldown or functional validation of the transportin–NAB2 interaction
   • Shown in P. berghei, not directly in P. falciparum PF3D7_0627700
   • Functional consequence of the interaction (cargo import, RNA handling) not established

• Whether PF3D7_0627700 functions as a bona fide nuclear import receptor in P. falciparum, what cargo it transports, and whether the NAB2 interaction seen in P. berghei applies to the P. falciparum protein remain unresolved.
• No direct import or Ran-GTP release assay for PF3D7_0627700
• No cargo repertoire defined
• No genetic knockout/knockdown phenotype reported for this gene