Transcription factor S4

UniProtKB accession:  Q97X43

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UniProtKB description:  A potent inhibitor of RNA polymerase (RNAP) probably involved in viral defense. Destabilizes the transcription pre-initiation complex of TBP, TFB, DNA and RNAP, inhibits abortive transcription initiation, productive initiation and transcription elongation. Increases the RNAP KM for NTPs about 50-fold. Overexpression of TFS1-tip4 (TFS1 with the active tip of this protein, phenocopies this protein) in S.acidocaldarius MW001 leads to severe growth inhibition (PubMed:29203770). When bound to RNAP induces conformational changes that widen the DNA-binding channel, probably destabilizing the interaction of DNA with RNAP (PubMed:34535646).