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I'd like to optimize the expression of a Fab fragment in Escherichia coli. For induction of the lac promoter on the pAK400 vector I use IPTG and sucrose. Do I optimize the expression in case I would just add IPTG?

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You can induce the lac operon by two things: Lactose (or more precisely Allolactose a metabolite of it) and lactose analogons which are not metabolized by the bacteria.

Lactose induces the expression and is metabolized while IPTG is not a target of the $\beta$-Galactosidase and will give you a strong and permanent induction. Sucrose will not have any effect on the promoter.

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