PF3D7_0317600

PF3D7_0317600 (S11) is a structural component of the small (40S) subunit of the P. falciparum cytoplasmic 80S ribosome, established by high-resolution cryo-EM structures of the parasite ribosome (PMID:24913268, PMID:26432834) and confirmed in its native, actively translating state by in situ cryo-electron tomography inside infected erythrocytes (PMID:40825879). Its placement within the 40S particle was defined structurally, and atomic models built by flexible fitting captured features distinguishing the P. falciparum ribosome from the mammalian ribosome (PMID:26432834). Beyond its assignment as a 40S component, no S11-specific functional, catalytic, or interaction experiments have been reported in the available corpus; the gene is characterized solely by membership in the small ribosomal subunit.

1. 2014 Medium

   Establishing the molecular architecture of the P. falciparum ribosome answered where S11 sits in the parasite translation machinery, placing it as a bona fide component of the 40S small subunit.

   Evidence Cryo-EM structure of the P. falciparum 80S ribosome at 3.2 Å in complex with emetine

   PMID:24913268

   Open questions at the time

   • Membership is inferred from the structural map; no functional experiment specific to S11 was performed
   • No S11-specific interactions or role in subunit assembly defined
2. 2015 Medium

   Multiple independent reconstructions from blood-stage schizonts corroborated S11 as a stable structural constituent of the 40S subunit and refined parasite-specific features distinguishing it from the mammalian ribosome.

   Evidence Five cryo-EM reconstructions with atomic model building by flexible fitting of ribosomes purified from schizonts

   PMID:26432834

   Open questions at the time

   • Ribosome-level analysis from a single group; no direct interrogation of S11 function
   • No test of whether parasite-specific features involve S11 directly
3. 2025 Medium

   Resolving the native ribosome inside infected erythrocytes confirmed that S11 is a component of the actively translating 40S subunit in its physiological cellular context, not merely in purified preparations.

   Evidence In situ cryo-electron tomography of P. falciparum-infected human erythrocytes yielding eight high-resolution translating-state structures

   PMID:40825879

   Open questions at the time

   • Single study; no experiment isolates S11's individual contribution to translation elongation
   • No functional or genetic assessment of S11 requirement in the parasite

• Whether S11 has any function beyond structural incorporation into the 40S subunit — including specific rRNA/protein contacts, a role in subunit assembly or translation fidelity, and essentiality in the parasite — remains uncharacterized.
• No S11 knockout, knockdown, or rescue data
• No S11-specific binding partners or contacts defined beyond ribosome membership
• No evidence of any extraribosomal role