# RBX1

Source: https://onco.cc/targets/rbx1/  
OnCo record `rbx1` (Target). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

RBX1 (E3 ubiquitin-protein ligase RBX1) is an enzyme. The public catalogues list it as a drug target and a DNA repair gene, and an approved or late-stage drug is recorded against it. Tied to Multiple myeloma, Non-Hodgkin lymphoma, Myelodysplastic syndromes / neoplasms and 2 more.

## Summary

E3 ubiquitin ligase component of multiple cullin-RING-based E3 ubiquitin-protein ligase (CRLs) complexes which mediate the ubiquitination and subsequent proteasomal degradation of target proteins, including proteins involved in cell cycle progression, signal transduction, transcription and transcription-coupled nucleotide excision repair. CRLs complexes and ARIH1 collaborate in tandem to mediate ubiquitination of target proteins, ARIH1 mediating addition of the first ubiquitin on CRLs targets. The functional specificity of the E3 ubiquitin-protein ligase complexes depends on the variable substrate recognition components.

Open Targets scores its association with cancer at 0.74 (direct and indirect evidence; datatypes literature 0.96, affected pathway 0.83, genetic association 0.03, clinical 0.99).

## Fields

- Kind: Target
- Last checked: 2026-09-23
- Also known as: ring-box 1; E3 ubiquitin-protein ligase RBX1; ROC1; RNF75; BA554C12.1
- Tags: cancer-genes-wave
- Symbol: RBX1
- Class: enzyme
- Biology: E3 ubiquitin ligase component of multiple cullin-RING-based E3 ubiquitin-protein ligase (CRLs) complexes which mediate the ubiquitination and subsequent proteasomal degradation of target proteins, including proteins involved in cell cycle progression, signal transduction, transcription and transcription-coupled nucleotide excision repair. CRLs complexes and ARIH1 collaborate in tandem to mediate ubiquitination of target proteins, ARIH1 mediating addition of the first ubiquitin on CRLs targets. The functional specificity of the E3 ubiquitin-protein ligase complexes depends on the variable substrate recognition components. As a component of the CSA complex mediates ubiquitination of Pol II subunit POLR2A at 'Lys-1268', a critical TC-NER checkpoint. Core component of the Cul7-RING(FBXW8) ubiquitin ligase complex, which mediates the ubiquitination and subsequent proteasomal degradation of target proteins. Core component of a Cul9-RING ubiquitin ligase complex composed of CUL9 and RBX1, which mediates mono-ubiquitination of p53/TP53. Location: Cytoplasm; Nucleus (UniProt). Locus 22q13.2 (HGNC).
- Where found: Multiple myeloma: Open Targets association 0.62 with plasma cell myeloma (MONDO_0009693); Non-Hodgkin lymphoma: Open Targets association 0.59 with non-Hodgkin lymphoma (MONDO_0018908); Myelodysplastic syndromes / neoplasms: Open Targets association 0.56 with myelodysplastic syndrome (MONDO_0018881); Follicular lymphoma: Open Targets association 0.57 with follicular lymphoma (MONDO_0018906); Mantle cell lymphoma: Open Targets association 0.55 with mantle cell lymphoma (MONDO_0018876)

## Notes

- Written by scripts/fetch-cancer-genes.ts from CIViC, Open Targets, IntOGen, HGNC and UniProt; the function text is UniProt's, condensed and in UK spelling. Roles: Open Targets known-drug datatype score 0.99; UniProt keyword "DNA repair". Evidence tier "approved-drug" is the strongest of those signals.
- Prevalence not recorded: none of the sources gives a positivity rate.

## Sources

- HGNC HGNC:9928: https://www.genenames.org/data/gene-symbol-report/#!/hgnc_id/HGNC:9928
- UniProt P62877: https://www.uniprot.org/uniprotkb/P62877/entry
- NCBI Gene 9978: https://www.ncbi.nlm.nih.gov/gene/9978
- Ensembl ENSG00000100387: https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000100387

## Connected records

- collections: [Open Targets Platform](https://onco.cc/collections/open-targets/)
- cancers: [Follicular lymphoma](https://onco.cc/cancers/follicular-lymphoma/), [Mantle cell lymphoma](https://onco.cc/cancers/mantle-cell-lymphoma/), [Multiple myeloma](https://onco.cc/cancers/multiple-myeloma/), [Myelodysplastic syndromes / neoplasms (MDS)](https://onco.cc/cancers/mds/), [Non-Hodgkin lymphoma (all types)](https://onco.cc/cancers/non-hodgkin-lymphoma/)

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JSON: https://onco.cc/api/v1/entities/rbx1.json