Tuner™ strains are lacZY deletion mutants of BL21 and enable adjustable levels of protein expression throughout all cells in a culture. The lac permease (lacY) mutation allows uniform entry of IPTG into all cells in the population, which produces a concentration-dependent, homogeneous level of induction. By adjusting the concentration of IPTG, expression can be regulated from very low levels up to the robust, fully induced levels commonly associated with pET vectors. Lower-level expression may enhance the solubility and activity of difficult target proteins. In Tuner(DE3)pLacI, the rare tRNA genes are present on the same plasmid that carries the lac repressor gene.
DE3 indicates that the host is a lysogen of λDE3, and therefore carries a chromosomal copy of the T7 RNA polymerase gene under control of the lacUV5 promoter. Such strains are suitable for production of protein from target genes cloned in pET vectors by induction with IPTG.
Genotype: F– ompT hsdSB (rB– mB–) gal dcm lacY1(DE3) pLacI (CamR)
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Product information
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Avoid freeze/thaw
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Yes
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Components
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| 0.4 ml | 1 ml | Component
| | • | 2 × 0.2 ml | 5 × 0.2 ml | Tuner(DE3)pLacI Competent Cells
| | • | 2 × 2 ml | 4 × 2 ml | SOC Medium
| | • | 2 ng | 2 ng | Test Plasmid |
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Guaranteed efficiency
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Guaranteed efficiency: > 2 x 106 cfu/μg
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Store and ship information
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Storage
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≤ -70°C
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Ship
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Dry Ice Only
Multiple Toxicity Values, refer to MSDS
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Licence Brookhaven
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This product is covered under license from Brookhaven National Labs. Commercial entities need to obtain a research use license prior to purchase. Please contact your licensing department to confirm that your company already holds a research use license.
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