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RNA polymerase sigma-I factor Members of this sigma factor protein family are strictly limited to endospore-forming species in the Firmicutes lineage of bacteria, but are not universally present among such species. Sigma-I was shown to be induced by heat shock () in Bacillus subtilis and is suggested by its phylogenetic profile to be connected to the program of sporulation (). [Transcription, Transcription factors, Cellular processes, Sporulation and germination] |
Jiyao W et al.(2023). "The conserved domain database in 2023.",