RPS30

PF3D7_0219200 (RPS30) is a constituent protein of the small (40S) subunit of the P. falciparum 80S ribosome, its structural context within the assembled ribosome having been resolved by high-resolution cryo-EM of ribosomes purified from blood-stage schizonts (PMID:24913268, PMID:26432834). These structures place RPS30 within a 40S subunit whose features distinguish the parasite ribosome from its mammalian counterpart, and captured the ribosome bound to the translation inhibitor emetine at the small-subunit E-site (PMID:24913268, PMID:26432834). Independently, the RPS30 promoter drives strong, constitutive expression across the complete parasite life cycle including liver stages, identifying it as a housekeeping gene (PMID:32587831). Beyond its membership in the 40S subunit and its constitutive promoter activity, no experiment in the available corpus has defined a specific molecular function or binding interaction for RPS30 itself.

1. 2014 Medium

   To understand how antimalarial translation inhibitors act on the parasite ribosome, the first high-resolution structure was needed, which placed RPS30 within the structural context of the 40S subunit.

   Evidence Cryo-EM of the P. falciparum 80S ribosome-emetine complex at 3.2 Å, with emetine at the small-subunit E-site

   PMID:24913268

   Open questions at the time

   • No functional experiment targeted RPS30 individually; its role is inferred solely from 40S subunit membership
   • No RPS30-specific binding partners or contacts within the subunit were dissected
   • Does not establish any function outside the ribosome
2. 2015 Medium

   To define features that distinguish the parasite ribosome from the mammalian one for drug-targeting purposes, cryo-EM reconstructions from schizonts provided atomic models of the subunits containing RPS30.

   Evidence Cryo-EM with five reconstructions of ribosomes purified from P. falciparum schizonts and atomic model building by flexible fitting

   PMID:26432834

   Open questions at the time

   • RPS30 was not experimentally probed as an individual protein
   • No RPS30-specific functional or interaction data emerged
   • Structural role of RPS30 within the 40S subunit not functionally tested
3. 2020 Medium

   To determine whether RPS30 is expressed constitutively and could serve as a promoter for transgene expression, reporter lines driven by its promoter were tracked across the life cycle, establishing housekeeping-level activity.

   Evidence CRISPR/Cas9 transgenic reporter lines using the RPS30 promoter to drive GFP and mCherry-luciferase, with fluorescence/luminescence across blood, mosquito, and liver stages in NF54 and NF135.C10

   PMID:32587831

   Open questions at the time

   • Characterizes promoter transcriptional activity, not the RPS30 protein or its mechanism
   • Does not test RPS30 protein function, essentiality, or interactions
   • No link between constitutive expression and a specific ribosomal role established

• Whether RPS30 has any specific molecular function or binding interaction beyond its structural membership in the 40S subunit remains undefined in the available corpus.
• No experiment has defined an RPS30-specific molecular activity
• No RPS30-specific binding partners or substrates identified
• Essentiality and loss-of-function phenotype of RPS30 not established