RPS10

RPS10 (eS10) is a structural component of the 40S small ribosomal subunit that participates in 18S rRNA maturation and in surveillance pathways that monitor ribosome function during translation (PMID:20116044, PMID:37751929). It is required for processing of the 18S-E pre-rRNA, and loss of RPS10 function disrupts this maturation step (PMID:20116044). On the assembled ribosome, RPS10 acts as a docking site for regulatory and quality-control machinery: it directly and RNA-independently contacts Gcn1 to enable full activation of the eIF2α kinase Gcn2 during amino acid starvation (PMID:25437641), and it engages the N-terminal tail of eIF1A in a manner linked to scanning arrest, where weakened RPS10–eIF1A binding favors an open, scanning-competent 43S pre-initiation complex (PMID:30420357). RPS10 is a principal substrate of the E3 ubiquitin ligase ZNF598/Znf598, whose ubiquitination of eS10 triggers ribosome-associated quality control (RQC), an event that herpesvirus-encoded ubiquitin deconjugases reverse to rescue stalled ribosomes and stall-inducing mRNAs from degradation [PMID:37751929, PMID:bio_10.1101_2025.03.04.641470]. Heterozygous loss-of-function mutations in RPS10 cause Diamond-Blackfan anemia through haploinsufficiency, with defective rRNA processing accompanied by GATA1 downregulation and p53 pathway activation (PMID:20116044, PMID:40960598).

1. 2010 High

   Established that RPS10 is functionally required for ribosome biogenesis rather than merely a passive structural subunit, by linking its loss to a specific rRNA maturation defect and to human disease.

   Evidence Pre-rRNA processing analysis in Diamond-Blackfan anemia patient lymphoblastoid cells and siRNA knockdown in HeLa cells

   PMID:20116044

   Open questions at the time

   • Does not resolve which step of small-subunit assembly RPS10 acts at structurally
   • Mechanistic link between processing failure and the erythroid-specific disease phenotype not established here
2. 2012 Medium

   Identified RPS10 as a target exploited by HIV-1 Nef, raising the possibility that the 40S subunit is co-opted for viral translational control.

   Evidence Co-immunoprecipitation, RT-PCR detection of 18S rRNA and tRNAs in complexes, and in vitro translation assay

   PMID:22672539

   Open questions at the time

   • Direct versus ribosome-bridged interaction not distinguished
   • Functional contribution of RPS10 binding to Nef-mediated translation inhibition not isolated
   • Single-lab co-IP without reciprocal validation
3. 2015 High

   Resolved RPS10 as the physical ribosomal anchor for Gcn1, placing it within the Gcn1–Gcn2 nutrient-sensing signaling axis on the ribosome.

   Evidence Yeast two-hybrid, in vitro co-precipitation, and genetic epistasis in rps10AΔ/rps10BΔ yeast strains with eIF2α phosphorylation readouts

   PMID:25437641

   Open questions at the time

   • Structural basis of the Rps10–Gcn1 contact not defined
   • Whether the interaction is conserved and operates identically in human cells not tested
4. 2019 Medium

   Connected RPS10 to translation initiation fidelity by showing its eIF1A-dependent role in scanning arrest, providing a mechanism by which initiation-factor mutations reshape mRNA selection.

   Evidence Co-immunoprecipitation of eIF1A N-terminal-tail mutants with RPS10/RPS3, ribosome profiling, and luciferase reporter assays

   PMID:30420357

   Open questions at the time

   • Direct RPS10 contribution not separated from RPS3
   • Structural model of the scanning-arrest contact lacking
   • Single-lab study
5. 2023 High

   Defined RPS10 as a principal in vivo substrate of ZNF598/Znf598-mediated ribosome ubiquitination, marking it as a molecular trigger point for ribosome-associated quality control.

   Evidence Affinity purification of FLAG-tagged ribosomes from endogenous-locus knock-in zebrafish with ubiquitination-site mutation analysis

   PMID:37751929

   Open questions at the time

   • Downstream RQC effectors recruited by ubiquitinated eS10 not enumerated here
   • Developmental phenotype of ubiquitination-site mutants not fully characterized
6. 2025 Medium

   Showed that RPS10 ubiquitination is a reversible, actively contested switch by demonstrating that viral deubiquitinases erase it to abort RQC and permit readthrough of stalled mRNAs.

   Evidence Ubiquitination assays with vDUB overexpression, RQC substrate rescue assays, and mRNA readthrough reporters in cells (preprint)

   PMID:bio_10.1101_2025.03.04.641470

   Open questions at the time

   • Not yet peer-reviewed
   • Direct vDUB activity on eS10-linked ubiquitin chains versus indirect effects not fully separated
7. 2025 Medium

   Reinforced the haploinsufficiency mechanism of RPS10 in Diamond-Blackfan anemia by tying a nonsense variant to rRNA processing failure, GATA1 loss, and p53 activation.

   Evidence Whole exome sequencing with Sanger confirmation and quantitative RT-PCR of TP53/GATA1/RPS10 plus rRNA processing analysis in patient cells

   PMID:40960598

   Open questions at the time

   • Single patient/lab, not independently replicated
   • Causal chain from p53 activation to erythroid failure not mechanistically dissected

• How RPS10's distinct roles—rRNA processing, Gcn2 activation, scanning arrest, and ZNF598-triggered RQC—are structurally coordinated on a single subunit, and why its loss produces an erythroid-specific disease, remains unresolved.
• No integrated structural model placing the Gcn1, eIF1A, and ubiquitination sites on eS10
• Tissue specificity of the DBA phenotype unexplained