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Target intelligence / Profile preview
DNA-directed RNA polymerase III subunit E (POLR3E)
- Target
- POLR3E
- Molecular classification
- Enzyme (as subunit of a multi-subunit RNA polymerase), Transcription factor complex component (as part of RNA polymerase III), Other: Polymerase subunit
01
Overview
DNA-directed RNA polymerase III subunit E (POLR3E) is a structural and functional subunit of the multi-protein RNA polymerase III complex in eukaryotes. As part of the RPC4-RPC5 heterodimer, it is closely involved in key steps of transcription initiation, promoter opening, and termination for small non-coding RNAs, including tRNAs, 5S rRNA, and U6 snRNA. POLR3E is essential for the production of these RNAs, which are critical for protein biosynthesis and other cellular processes. In addition to its canonical role in transcription, POLR3E (as part of the Pol III complex) participates in viral DNA sensing and innate immune responses. Mutations in POLR3E or its interacting subunits are linked to several human diseases, most notably cancers and neurodevelopmental disorders. There are no known specific drugs or biomarkers related to POLR3E, and global loss-of-function is generally deleterious due to its universal cellular role.
- Other names
- RNA polymerase III subunit C5RPC5KIAA1452SINFLJ10509C37RNA polymerase III 80 kDa polypeptideRNA polymerase III 80 kDa subunit RPC5polymerase (RNA) III (DNA directed) polypeptide E (80kD)polymerase (RNA) III subunit E
02
Mechanism of action
Not applicable (no drugs known to target this subunit directly)
03
Biological functions
Transcription of small non-coding RNAs (notably tRNAs, 5S rRNA, U6 snRNA)Promoter opening and transcription initiationTranscription termination (as TFIIF-like dimer with POLR3D)Cellular growth and division via production of key RNA moleculesViral DNA sensing in innate immunity (noncanonical role)
04
Disease associations
Cancer (dysregulation linked to tumor transformation and various cancers)Neurodegenerative disease (association with disorders due to imbalance or defects in Pol III function)Other (mutations implicated in systemic morphological and neurological diseases, e.g., demyelinating leukodystrophy, Treacher Collins syndrome)
05
Safety considerations
Essential for cell viability; broad inhibition of POLR3E function would severely impair fundamental RNA synthesis and cell survivalMutations may cause developmental or neurological disorders
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