Production and Characterization of a Single-Chain Fv Antibody–Alkaline Phosphatase Fusion Protein Specific for Clenbuterol |
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Authors: | Xixia Liu Hong Wang Yan Liang Jinyi Yang Hongbin Zhang Hongtao Lei Yudong Shen Yuanming Sun |
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Institution: | (1) Key Laboratory of Food Quality and Safety of Guangdong Province, College of Food Science, South China Agricultural University, Wushan Road, Tianhe District, Guangzhou, Guangdong Province, 510642, People’s Republic of China;(2) Department of Medical Research, Guangzhou General Hospital of Guangzhou Military Command, Guangzhou, 510010, People’s Republic of China; |
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Abstract: | The production and characterization of an anti-clenbuterol single-chain Fv antibody (CBLscFv)–bacterial alkaline phosphatase
(AP) fusion protein are described. The CBLscFv and the phoA gene of Escherichia coli strain K12 chromosomal DNA were cloned by PCR and sequentially inserted into the expression vector pBV220 to express the
CBLscFv–AP fusion protein in E. coli strain BL21(DE3)pLysS. SDS–PAGE and western blot analyses revealed that the fusion protein showed a molecular weight of 73 kDa
and bound with the antibacterial AP monoclonal antibody. Determination of enzymatic activity indicated that k
cat and K
m values of the fusion protein were 113.60 s−1 and 29.82 μM, respectively. Competitive direct enzyme-linked immunosorbent assay based on the obtained fusion protein indicated
that the average concentration required for 50% inhibition of binding (IC50) and the limit of detection for CBL were 4.74 ± 0.003 (n = 3) and 0.54 ± 0.004 (n = 3) μg/l, respectively, and the linear response range extended from 1.13 to 69.68 μg/l. Cross-reactivity studies showed
that the fusion protein did not cross-react with CBL analogs. The present findings indicate that the production of the CBLscFv–AP
fusion protein in E. coli strain BL21(DE3)pLysS is feasible and suggest that it could be further used to develop a one-step ELISA for the specific
detection of CBL. |
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