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bl21 competent cells  (New England Biolabs)


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    Structured Review

    New England Biolabs bl21 competent cells
    Bl21 Competent Cells, supplied by New England Biolabs, used in various techniques. Bioz Stars score: 96/100, based on 878 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
    https://www.bioz.com/product/bl21+competent+e+coli/BL21+Comp+E%2Ecoli/pmc13155313-202-6-9
    Average 96 stars, based on 878 article reviews
    bl21 competent cells - by Bioz Stars, 2026-09
    96/100 stars

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    Related Articles

    Plasmid Preparation:

    Article Title: Discovery of PRMT5 N-Terminal TIM Barrel Ligands from Machine-Learning-Based Virtual Screening
    Article Snippet: .. pT7-FLAG-His-TIM plasmid was expressed in BL21 competent E. coli (New England Biolabs, #C2530H). ..

    Incubation:

    Article Title: Designed miniproteins potently inhibit and protect against MERS-CoV.
    Article Snippet: We used a BsaI golden gate assembly (NEB) in a 1 μl mixture reaction containing: 0.1 μl water, 0.1 μl T4 ligase buffer, 0.375 μl eblock fragment at 4 ng/μl, 0.06 μl of BsaI-HFv2, 0.1 μl T4 ligase, 0.275 μl of LM0627 vector at 50 ng/μl. .. Reactions were incubated for 30 min at 37◦C before transformation of BL21 competent E. coli (NEB) cells. .. Plasmid sequences were confirmed through sanger sequences of the insert using T7 and T7-term primers from Azenta.

    Article Title: Designed miniproteins potently inhibit and protect against MERS-CoV
    Article Snippet: We used a BsaI golden gate assembly (NEB) in a 1 μL mixture reaction containing: 0.1 μL water, 0.1 μL T4 ligase buffer, 0.375 μL eblock fragment at 4 ng/μL, 0.06 μL of BsaI-HFv2, 0.1 μL T4 ligase, 0.275 μL of LM0627 vector at 50 ng/μL. .. Reactions were incubated for 30 minutes at 37°C before transformation of BL21 competent E. coli (NEB) cells. .. Plasmid sequences were confirmed through sanger sequences of the insert using T7 and T7-term primers from Azenta.

    Article Title: Designed miniproteins potently inhibit and protect against MERS-CoV
    Article Snippet: We used a BsaI golden gate assembly (NEB) in a 1 μl mixture reaction containing: 0.1 μl water, 0.1 μl T4 ligase buffer, 0.375 μl eblock fragment at 4 ng/μl, 0.06 μl of BsaI-HFv2, 0.1 μl T4 ligase, 0.275 μl of LM0627 vector at 50 ng/μl. .. Reactions were incubated for 30 min at 37°C before transformation of BL21 competent E. coli (NEB) cells. .. Plasmid sequences were confirmed through sanger sequences of the insert using T7 and T7-term primers from Azenta.

    Transformation Assay:

    Article Title: Designed miniproteins potently inhibit and protect against MERS-CoV.
    Article Snippet: We used a BsaI golden gate assembly (NEB) in a 1 μl mixture reaction containing: 0.1 μl water, 0.1 μl T4 ligase buffer, 0.375 μl eblock fragment at 4 ng/μl, 0.06 μl of BsaI-HFv2, 0.1 μl T4 ligase, 0.275 μl of LM0627 vector at 50 ng/μl. .. Reactions were incubated for 30 min at 37◦C before transformation of BL21 competent E. coli (NEB) cells. .. Plasmid sequences were confirmed through sanger sequences of the insert using T7 and T7-term primers from Azenta.

    Article Title: A novel fibronectin-binding peptide reveals dynamic intermediate structures during matrix assembly
    Article Snippet: The ligated product was transformed into DH5⍺ competent E. coli (NEB), DNA was extracted from positive clones (QIAprep Spin Miniprep Kit, Qiagen) and the fusion protein-peptide sequence was confirmed by whole plasmid nanopore sequencing (Plasmidsaurus Inc.). .. The resulting GST-peptide-EGFP plasmids were transformed into BL21 competent E. coli (NEB) for protein expression and purification. .. EGFP was replaced with an mScarlet cDNA amplified using the pmScarlet_C1 plasmid (Addgene) with the addition of XhoI and BsrGI restriction sites.

    Article Title: What comes after de novo ? Automated lead optimization of proteins with CRADLE-1
    Article Snippet: .. Per reaction mix, 5 μL was transformed into either SHuffle® Express Competent E. coli (NEB, C3028) (for anti-SARS VHH and anti-snake venom VHH) or BL21 Competent E. coli (NEB, C2530H) (for haloalkane dehalogenase and serine-pyruvate aminotransferase libraries), following NEB’s instructions. .. The resulting DNA ORFs were then computationally flanked by user-defined 5′ and 3′ sequences to generate the DNA sequences ready to order at Twist Bioscience.

    Article Title: Designed miniproteins potently inhibit and protect against MERS-CoV
    Article Snippet: We used a BsaI golden gate assembly (NEB) in a 1 μL mixture reaction containing: 0.1 μL water, 0.1 μL T4 ligase buffer, 0.375 μL eblock fragment at 4 ng/μL, 0.06 μL of BsaI-HFv2, 0.1 μL T4 ligase, 0.275 μL of LM0627 vector at 50 ng/μL. .. Reactions were incubated for 30 minutes at 37°C before transformation of BL21 competent E. coli (NEB) cells. .. Plasmid sequences were confirmed through sanger sequences of the insert using T7 and T7-term primers from Azenta.

    Article Title: Designed miniproteins potently inhibit and protect against MERS-CoV
    Article Snippet: We used a BsaI golden gate assembly (NEB) in a 1 μl mixture reaction containing: 0.1 μl water, 0.1 μl T4 ligase buffer, 0.375 μl eblock fragment at 4 ng/μl, 0.06 μl of BsaI-HFv2, 0.1 μl T4 ligase, 0.275 μl of LM0627 vector at 50 ng/μl. .. Reactions were incubated for 30 min at 37°C before transformation of BL21 competent E. coli (NEB) cells. .. Plasmid sequences were confirmed through sanger sequences of the insert using T7 and T7-term primers from Azenta.

    other:

    Article Title: A novel fibronectin-binding peptide reveals dynamic intermediate structures during matrix assembly.
    Article Snippet: Fusion protein generation and purification Peptide sequences were inserted between GST and EGFP sequences in pGEX4T3-GST-EGFP expression plasmid (Addgene) using the Q5 Site-Directed Mutagenesis Kit (NEB).

    Expressing:

    Article Title: A novel fibronectin-binding peptide reveals dynamic intermediate structures during matrix assembly
    Article Snippet: The ligated product was transformed into DH5⍺ competent E. coli (NEB), DNA was extracted from positive clones (QIAprep Spin Miniprep Kit, Qiagen) and the fusion protein-peptide sequence was confirmed by whole plasmid nanopore sequencing (Plasmidsaurus Inc.). .. The resulting GST-peptide-EGFP plasmids were transformed into BL21 competent E. coli (NEB) for protein expression and purification. .. EGFP was replaced with an mScarlet cDNA amplified using the pmScarlet_C1 plasmid (Addgene) with the addition of XhoI and BsrGI restriction sites.

    Purification:

    Article Title: A novel fibronectin-binding peptide reveals dynamic intermediate structures during matrix assembly
    Article Snippet: The ligated product was transformed into DH5⍺ competent E. coli (NEB), DNA was extracted from positive clones (QIAprep Spin Miniprep Kit, Qiagen) and the fusion protein-peptide sequence was confirmed by whole plasmid nanopore sequencing (Plasmidsaurus Inc.). .. The resulting GST-peptide-EGFP plasmids were transformed into BL21 competent E. coli (NEB) for protein expression and purification. .. EGFP was replaced with an mScarlet cDNA amplified using the pmScarlet_C1 plasmid (Addgene) with the addition of XhoI and BsrGI restriction sites.



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    New England Biolabs competent bl21 de3 e coli
    Expression and purification of Nb16-β-gal. <t>BL21</t> bacteria carrying pRCH-Nb16-βGal were used to produce the target protein. Proteins in lysates from uninduced (lane U) and induced (lane I) bacteria, fractions containing the target protein after Ni 2+ column purification (lane 1), and the purified target protein after the second-step SEC purification (lane 2) were analyzed by SDS-PAGE on a 4–12% SDS gel. The molecular masses (in kDa) of the proteins in the protein standards (lane M) are indicated on the right side of the gel image. The horizontal arrow indicates the Nb16-β-gal band.
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    Image Search Results


    Construction of engineered E. coli strains and protein purification. (A) PCR identification of positive E. coli clones. Lanes 1–3 correspond to BL21-pET28-ST-PCV2 Cap, BL21-pET28-ST-PCV3 Cap, and BL21-pET28-SC-mi3, respectively. (B–D) Expression and purification of recombinant proteins ST-PCV2 Cap, ST-PCV3 Cap, and SC-mi3, respectively. Lanes 1–6 represent whole bacterial lysate, pellet after sonication, supernatant after sonication, Ni column flow-through, wash fraction, and purified protein, respectively. (E) Western blot validation of antigen proteins. Lanes 1, 2 correspond to ST-PCV2 Cap and ST-PCV3 Cap, respectively. (F) Endotoxin removal from recombinant protein solutions. Color intensity represents endotoxin content; numbers indicate endotoxin content (EU/mL).

    Journal: Frontiers in Veterinary Science

    Article Title: Construction and immunogenicity evaluation of a bivalent nanoparticle based on mi3 displaying porcine circovirus type 2 and type 3 capsid proteins

    doi: 10.3389/fvets.2026.1862938

    Figure Lengend Snippet: Construction of engineered E. coli strains and protein purification. (A) PCR identification of positive E. coli clones. Lanes 1–3 correspond to BL21-pET28-ST-PCV2 Cap, BL21-pET28-ST-PCV3 Cap, and BL21-pET28-SC-mi3, respectively. (B–D) Expression and purification of recombinant proteins ST-PCV2 Cap, ST-PCV3 Cap, and SC-mi3, respectively. Lanes 1–6 represent whole bacterial lysate, pellet after sonication, supernatant after sonication, Ni column flow-through, wash fraction, and purified protein, respectively. (E) Western blot validation of antigen proteins. Lanes 1, 2 correspond to ST-PCV2 Cap and ST-PCV3 Cap, respectively. (F) Endotoxin removal from recombinant protein solutions. Color intensity represents endotoxin content; numbers indicate endotoxin content (EU/mL).

    Article Snippet: The pET28a(+) plasmid for recombinant protein expression and BL21(DE3) E. coli competent cells were purchased from Sangon Biotech (Shanghai) Co., Ltd.

    Techniques: Protein Purification, Clone Assay, Expressing, Purification, Recombinant, Sonication, Western Blot, Biomarker Discovery

    Expression and purification of Nb16-β-gal. BL21 bacteria carrying pRCH-Nb16-βGal were used to produce the target protein. Proteins in lysates from uninduced (lane U) and induced (lane I) bacteria, fractions containing the target protein after Ni 2+ column purification (lane 1), and the purified target protein after the second-step SEC purification (lane 2) were analyzed by SDS-PAGE on a 4–12% SDS gel. The molecular masses (in kDa) of the proteins in the protein standards (lane M) are indicated on the right side of the gel image. The horizontal arrow indicates the Nb16-β-gal band.

    Journal: Food Chemistry: Molecular Sciences

    Article Title: Usage of nanobody-beta-galactosidase fusion in immunoassays and its application in detecting a peanut allergen

    doi: 10.1016/j.fochms.2026.100357

    Figure Lengend Snippet: Expression and purification of Nb16-β-gal. BL21 bacteria carrying pRCH-Nb16-βGal were used to produce the target protein. Proteins in lysates from uninduced (lane U) and induced (lane I) bacteria, fractions containing the target protein after Ni 2+ column purification (lane 1), and the purified target protein after the second-step SEC purification (lane 2) were analyzed by SDS-PAGE on a 4–12% SDS gel. The molecular masses (in kDa) of the proteins in the protein standards (lane M) are indicated on the right side of the gel image. The horizontal arrow indicates the Nb16-β-gal band.

    Article Snippet: Competent E. coli BL21 (BL21 StarTM (DE3), Fisher Scientific) was transformed with each of the plasmids described above.

    Techniques: Expressing, Purification, Bacteria, SDS Page, SDS-Gel