Sigma subunit
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Sigma subunit is a subunit located on RNA polymerase. It recognizes the promoter used in transcription for bacteria. Its alpha helix interacts with a sequence call Pribnow box or -10 region on the promoter site.
[edit] References
Merrill, Dr. Gary F. 'Transcription', lecture notes distributed in Biochemistry 451 General Biochemistry, Oregon State University, Weigend on 06 June 2006.