IPTG Induction of recombinant protein production
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IPTG Induction of recombinant protein production
IPTG induction and bacterial growth
A introduction and experimental protocol on BL21 e.coli recombinant protein expression and induction with IPTG. (Structural biology Protein preparation protocols, South Africa Structural Biology Initiative)
The induction of recombinant protein expression is effected by addition of the non-metabolisable lac-inducer IPTG. Although the process is simple in theory, the BL21 cells tend to form inclusion bodies very easily. This reduces recovery dramatically and therefore in the past, each recombinant protein had to be assessed individually for their solubility and expression.
IPTG Induction and Extraction of Proteins from Bacteria (by Swathi Arur and Sudhir Nayak)
Induction in bacteria can be performed using one of two basic methods. Fast induction does not work for all proteins and can give you suboptimal yields. Slow induction can enhance the solubility of some proteins.
GST Fusion Protein Production through IPTG induction
This protocol uses pET Expression System and BL21(DE3) E. coli.
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Last update 18-Sep-2006, Rating Fair of 12 votes.
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i am also expressing my gene in Bl21DE3pLysS strain as i didn't get expression of my protein in Bl21DE strain.Whats the reason that in some cases our protein expression is equal or more in uninduced than induced ones seen in SDS-PAGE?
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hi..i m also doin' the same xprmt using BL21 star w' pET, but pET101/D-TOPO. since your SDS doesn't shows any results, hv you tried the western blottin' for detection? if there are no detections, might be your ligation to the vector didnt work.
Rating: Good
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Iam facing troubles with assay of NAG N-acetyl D-glucosamine(Reisseig et al,1954) .activity is observed on plate but not detected in assay.
Can anyone please suggest me its solution?
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i use BL21 with vector PET system from novagen.i tried different conentrations of IPTG.By running SDS gel,it does not show my protein.
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what will happen if we induce the cells with IPTG before 0.4 OD?(to be precise at 0.37)Will there be any variation in the amount of the protein expressed? If induced before 0.4 OD then do we need to increase the incubation time of the culture in the shaker? thanks in advance.
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IPTG acts by lowering the problems of inclusion bodies and you can get soluble protien .normally induction is done when the cells are growing at mid log phase from 0.5 to 0.7.
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IPTG with higher conc. will inhibit the growth and u plz tell me the conc. of IPTG u used and time of incubation after induction.
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I trying to do protein (19kDa) expression by using the pet19b vector. Surprinsingly I detected a stronger expression without IPTG than with IPTG.
Does anyone know the reason?
Thanks!
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Has anyone found an optimal [IPTG] when using the pET15b vector for small protein expression (~4kDa)?
Rating: Fair
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i am doing protein expression by using IPTG.
how it will act in expression?
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have you taken care that you sonicated or lysed the cell after an incubation of 6 hours after inducing with IPTG. measure the OD before lysing. I found better yield after an od of 1.4 which may take around eight hours if you induced at 0.4 OD
Rating: Fair
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I use same cell BL21 with vector pNET system from Novagen. I add IPTG after OD 0.4-0.6. What happened is cells with IPTG growing much lower than negative control ones (without IPTG). By running a SDS-Page gel, it show my gene did not have expression on this experiment.
Dose anyone know the reason?
My Gene has GC rich region at begining.
Rating: Very Good
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