From owner-metabolic-reg@net.bio.net Mon Dec 13 22:27:28 1999 Path: hgmp.mrc.ac.uk!server1.netnews.ja.net!join.news.pipex.net!pipex!tank.news.pipex.net!pipex!news.maxwell.syr.edu!cpk-news-hub1.bbnplanet.com!news.gtei.net!cs.utexas.edu!news.cc.utah.edu!not-for-mail From: Joshua Cherry Newsgroups: bionet.metabolic-reg Subject: Re: Product-inducible enzymes? Date: 13 Dec 1999 15:27:23 -0700 Organization: University of Utah - ACLIS Lines: 6 Message-ID: References: <8309er$46o$1@pegasus.csx.cam.ac.uk> NNTP-Posting-Host: harp.genetics.utah.edu X-Trace: coward.ks.cc.utah.edu 945124043 12552 155.100.232.143 (13 Dec 1999 22:27:23 GMT) X-Complaints-To: abuse@cc.utah.edu NNTP-Posting-Date: 13 Dec 1999 22:27:23 GMT X-Newsreader: Gnus v5.3/Emacs 19.33 Xref: hgmp.mrc.ac.uk bionet.metabolic-reg:189 In a sense, E. coli beta-galactosidase is an example of this. Lactose itself is a poor inducer of the lac operon. The real inducer is allolactose, which is produced from lactose by a side-reaction of beta-galactosidase. Josh Cherry .