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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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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