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Phosphorylation of Protein | Phosphoserine Incorporation | Protein Expression | Amid Biosciences

Amid Biosciences| Competent Cells and Protein Expression Vectors

BL21(DE3) ΔserB Chemically Competent Cells for Phosphoserine Incorporation

$ 500.00

BL21(λDE3) ΔserB is an engineered strain for specific co-translational O-phospho-L-serine  incorporation in a protein by an Escherichia coli. To prevent possible enzymatic dephosphorylation of O-phospho-L-serine (Sep) in vivo, the gene encoding phosphoserine phosphatase (serB), which catalyzes the last step in serine biosynthesis, was deleted from Escherichia coli strain BL21(DE3).

BL21(λDE3) ΔserB chemically competent cells are supplied as a pack of 10 convenient 100 μl/tube aliquots.  The transformation efficiency is ≥ 1x106 cfu/μg pBR322 plasmid DNA.

E. coli genotype: fhuA2 [lon] ompT gal (λ DE3) [dcm] ∆hsdS ΔserB

[λ DE3 = λ sBamHIo ∆EcoRI-B int::(lacI::PlacUV5::T7 gene1) i21 ∆nin5]

Catalog # BLPB-201

Storage: - 80°C. 

Shipping:  Product requires shipping on dry ice. Please contact for shipment estimates. 

Usage: This product is intended for LABORATORY RESEARCH USE ONLY. Not for diagnostic or therapeutic use.

Important Note: Purchase of BL21(λDE3) ΔserB cells includes a license for use only at site of purchase and may not be distributed to other sites.

License: The BL21(λDE3) ΔserB Strain when purchased conveys a limited use license to the end user. This license prohibits the purchaser from selling, assigning or transferring this product to any third party without the express written consent of Amid Biosciences, LLC. Please review this license before purchasing this product.


Park HS, et al. Expanding the genetic code of Escherichia coli with phosphoserine. Science. 2011 Aug 26;333(6046):1154. 10.1126/science.1207203

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