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69041

Sigma-Aldrich

B834(DE3) Competent Cells - Novagen

Escherichia coli, rod shaped

Synonym(s):

Competent cells

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$162.00
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About This Item

UNSPSC Code:
41106202
NACRES:
NA.81

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Product Name

B834(DE3) Competent Cells - Novagen, B834 is the parental strain for BL21. These hosts are methionine auxotrophs and allow high specific activity labeling of target proteins with 35S-methionine and selenomethionine for crystallography.

biological source

Escherichia coli

manufacturer/tradename

Novagen®

storage condition

OK to freeze
avoid repeated freeze/thaw cycles

growth mode

adherent or suspension

morphology

rod shaped

technique(s)

microbiological culture: suitable

cell transformation

transformation efficiency: >2×106 cfu/μg

shipped in

dry ice

storage temp.

−70°C

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B834(DE3) Competent Cells - Novagen B834 is the parental strain for BL21. These hosts are methionine auxotrophs and allow high specific activity labeling of target proteins with 35S-methionine and selenomethionine for crystallography.

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technique(s)

microbiological culture: suitable

technique(s)

microbiological culture: suitable

technique(s)

microbiological culture: suitable

technique(s)

microbiological culture: suitable

biological source

Escherichia coli

biological source

Escherichia coli

biological source

Escherichia coli

biological source

Escherichia coli

growth mode

adherent or suspension

growth mode

adherent or suspension

growth mode

adherent or suspension

growth mode

adherent or suspension

morphology

rod shaped

morphology

rod shaped

morphology

rod shaped

morphology

rod shaped

storage temp.

−70°C

storage temp.

−70°C

storage temp.

−70°C

storage temp.

−70°C

shipped in

dry ice

shipped in

dry ice

shipped in

dry ice

shipped in

dry ice

General description

B834 is the parental strain for BL21 (1). These protease-deficient hosts are methionine auxotrophs and allow high specific-activity labeling of target proteins with 35S-methionine and selenomethionine for crystallography (2).

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 met (DE3)

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 us to request certain information about you and the establishment where the GMOs are being handled. Click here for Enduser Declaration (EUD) Form.
B834 is the parental strain for BL21. These hosts are methionine auxotrophs and allow high specific activity labeling of target proteins with 35S-methionine and selenomethionine for crystallography.

Components

0.4 ml1 mlComponent

•2 × 0.2 ml5 × 0.2 mlB834(DE3)Competent Cells

•2 × 2 ml4 × 2 mlSOC Medium

•2 ng2 ngTest Plasmid

Warning

Toxicity: Multiple Toxicity Values, refer to MSDS (O)

Other Notes

1. Wood, W. B. (1966) J. Mol. Biol. 16, 118–133.

2. Leahy, D. J., Hendrickson, W. A., Aukhil, I., and Erickson, H. P. (1992) Science 258, 987–991.

Legal Information

NOVAGEN is a registered trademark of Merck KGaA, Darmstadt, Germany

Storage Class

10 - Combustible liquids

wgk_germany

WGK 2

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Questions

  1. Is this strain protease-free? If no what all proteases are present in it?

    1 answer

    1. This product is derived from a B strain deficient in Lon and OmpT proteases. B834, a protease-deficient host is a methionine auxotroph and allows high specific activity labeling of target proteins with 35S-methionine and selenomethionine for crystallography.

      Please see the link below to access the User Guide for this product:
      https://www.emdmillipore.com/US/en/product/B834DE3-Competent-Cells-Novagen,EMD_BIO-69041#anchor_USP

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