IPTG,Isopropylβ-D-1-thiogalactopyranoside,bindsthelacrepressorandinducesexpressionofβ-galactosidasein
E.coli.IPTGiswidelyusedtoinducetheexpressionofclonedgenesunderthecontrolofthelacoperonandtoscreenblue/whitecolonyinX-galplate.
Note:Toprepare10mL1MIPTGstocksolution,weight2.38gIPTGanddissolvein8mldistilledwater,adjusttoafinalvolumeof10mlwithdistilledwater.Sterilethesolutionusinga0.22umsyringefilter.Aliquotthestockandstoreunder-20°Cforuptooneyear.
ExpressionofGST-UCHL3inBL21(DE3)cellswasinducedbytheadditionof25μM(lane3),100μM(lane4),200μM(lane5)or400μM(lane6)IPTGat370Cfor2hours.Lane2withoutIPTG.