Talk:Sigma factor

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What is the 'sigma' in sigma factor? Why the different numbers? (i.e. what is the naming convention based on?) It does not appear to be based on molecular weight as with the heat shock proteins (because sigma 70 is about 40 kDa, at least in the PDB). Is it a parameter based on ultracentrifugation? Thanks for any insight. --Dan|^(talk) 16:37, 30 June 2006 (UTC)

Sigma 70 is 70kDA in E.coli

[edit] Merge proposal

Regarding the proposal to merge with Sigma protein and Sigma subunit by Tameeria:

Support "Sigma protein" is completely redundant with this article and should not exist; "Sigma subunit" makes no sense without the background provided by this article. Both articles should be redirects to this page. Adrian J. Hunter^{(talk•contribs)} 11:44, 9 December 2007 (UTC)

Support What Adrian says. Spitshine (talk) 11:47, 3 March 2008 (UTC)

Merged by redirecting sigma protein and sigma subunit to sigma factor. – ClockworkSoul 16:42, 21 March 2008 (UTC)