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70837 Origami™ B(DE3) Competent Cells - Novagen

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Catalogue NumberPackaging Qty/Pack
70837-3 Plastic ampoule 0.4 ml
70837-4 Glass bottle 1 ml
OverviewOrigami™ B host strains carry the same mutations in trxB and gor as the original Origami strains, except that they are derived from a lacZY mutant of BL21 to enable precise control of expression levels by adjusting the concentration of IPTG. Thus the Origami B strains combine the desirable characteristics of BL21, Tuner™, and Origami strains in one strain background. The mutations in trxB and gor are selectable on kanamycin and tetracycline, respectively; therefore, these strains cannot be used with plasmids that can only selected with kanamycin or tetracycline. These strains also include the lon and ompT deficiences of BL21, which increase protein stability.

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 ahpC (DE3) gor522:: Tn10 trxB (KanR, TetR)

This product contains genetically modified organisms (GMO). Within the EU GMOs are regulated by Directives 2001/18/EC and 2009/41/EC of the European Parliament and of the Council and their national implementation in the member States respectively. This legislation obliges MilliporeSigma to request certain information about you and the establishment where the GMOs are being handled. Click here for Enduser Declaration (EUD) Form.

This product is sold for internal research use only. Any commercial use of this product, its components, and/or any derivatives thereof (including but not limited to proteins produced using the product or its components) (together and hereinafter the 'EMD Product') requires signature of a written commercial use agreement with EMD Millipore Corporation or its successor-in-interest. Commercial use shall include but not be limited to: (1) use of the EMD Product to manufacture products for sale to third parties; (2) use of the EMD Product to provide services, information, or data to third parties in exchange for consideration; (3) use of the EMD Product for therapeutic, diagnostic or prophylactic purposes (including as part of a device, chip, assay or other product); or (4) resale of the EMD Product, whether or not such EMD Product is resold for research use. Nothing contained herein shall be deemed to represent or warrant that additional third party rights are not required for use of the EMD Product. Please direct any questions on these use restrictions to:
Catalogue Number70837
Brand Family Novagen®
Product Information
Guaranteed efficiencyGuaranteed efficiency: > 2 x 10⁶ cfu/μg
Quality LevelMQ100
Biological Information
Physicochemical Information
Materials Information
Toxicological Information
Safety Information according to GHS
Safety Information
Product Usage Statements
Storage and Shipping Information
Ship Code Dry Ice Only
Toxicity Multiple Toxicity Values, refer to MSDS
Storage ≤ -70°C
Do not freeze Ok to freeze
Packaging Information
Transport Information
Supplemental Information
Global Trade Item Number
Catalogue Number GTIN
70837-3 04055977272574
70837-4 04055977272581


Origami™ B(DE3) Competent Cells - Novagen SDS


Safety Data Sheet (SDS) 

Origami™ B(DE3) Competent Cells - Novagen Certificates of Analysis

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Competent Cell Brochure


  • Chikako Fukuda, Shigeyuki Kawai and Kousaku Murata. (2007) NADP(H) Phosphatase Activities of Archaeal Inositol Monophosphatase and Eubacterial 3'-Phosphoadenosine 5'-Phosphate Phosphatase. Applied and Enviornmental Microbiology 73, 5447-5452.
  • R. Jeremy Johnson, Shawn R. Lin and Ronald T. Raines. (2007) Genetic selection reveals the role of a buried, conserved polar residue. Protein Science 16, 1609-1616.
  • Gang Li, et al. (2005) N-Terminal insertion and C-terminal ankyrin-like repeats of α-latrotoxin are critical for Ca2+-dependent exocytosis. Journal of Neuroscience 25, 10188-10197.
  • HaJeung Park, Floyd G. Adsit and Jeffrey C. Boyington. (2005) The 1.4 A crystal structure of the human oxidized low density lipoprotein receptor LOX-1. Journal of Biological Chemistry 280, 13593-13599.
  • Naoko Tsuneyoshi, et al. (2005) The functional and structural properties of MD-2 required for lipopolysaccharide binding are absent in MD-11. Journal of Immunology 174, 340-344.
  • Li Wang, Gang Li and Shuzo Sugita. (2005) A central kinase domain of yype I phosphatidylinositol phosphate kinases is sufficient to prime exocytosis: isoform secificity and its underlying mechanism. Journal of Biological Chemistry 280, 16522-16527.
  • M. Claire H. Holland and John D. Lambris. (2004) A Functional C5a anaphylatoxin receptor in a teleost species. Journal of Immunology 172, 349-355.
  • M. Miertzschke and T. Greiner-Stoffele. (2003) The xthA gene product of Archaeoglobus fulgidus is an unspecific DNase. European Journal of Biochemistry 270, 1838-1849.
  • Atsushi Kodan, Hiroyuki Kuroda and Fukumi Sakai. (2002) A stilbene synthase from Japanese red pine (Pinus densiflora): Implications for phytoalexin accumulation and down-regulation of flavonoid biosynthesis. Procedings of the National Academy of Science 99, 3335-3339.
  • User Protocols

    TB009 Competent Cells
    TB053 Academic and Non-profit Laboratory Assurance Letter