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Promega Corporation

Single Step (KRX) Competent Cells

The Single Step (KRX) Competent Cells are designed for efficient transformation and tightly controlled protein expression. These cells consolidate the best attributes of these two steps into one strain to evaluate protein expression in E. coli.

Transformation efficiencies are greater than 108 cfu/μg, similar to other highly competent cells. The single step cells are available in single transformation size (50μl). KRX also can be used for blue/white screening.

Single Step (KRX) is an E. coli K strain that contains a chromosomal copy of the T7 RNA polymerase driven by a rhamnose promoter (rhaBAD) to provide dr...

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  • Prices valid for US customers only
Product Size Conc. Catalog # *List Price QTY Add to Cart

Single Step (KRX) Competent Cells

20 × 50μl
- L3002 $ 273.00 Add to cart

L-Rhamnose Monohydrate

10g
- L5701 $ 43.00 Add to cart

L-Rhamnose Monohydrate

50g
- L5702 $ 155.00 Add to cart


Storage Conditions

Always store competent cells at –70°C. Thaw on ice when ready for use. Do not refreeze thawed, unused aliquots.

For product intended use please see Patents & Disclaimers tab.

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