Answer to Question #64334 in Molecular Biology for Sanjukta Ghosh

Question #64334
Is sigma factor a transcription factor? After I googled 'sigma TF' I stumbled upon two papers(only). From a paper: Sigma factors (sigmas) are bacterial transcription factors that bind core RNA polymerase (RNAP) and direct transcription initiation at cognate promoter sites. and another paper had the title - Specific binding of the transcription factor sigma-54 to promoter DNA. However this contradicts with my book- Principle of Genetics Snustard and Simmons: 'Unlike their prokaryotic counterparts, eukaryotic RNAPs cannot initiate transcription by themselves ....require the assistance of protein transcription factors to start synthesis.' What's your opinion?
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