Construction of a high sensitive Escherichia coli alkaline phosphatase reporter system for screening affinity peptides |
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Authors: | Huang Xu Zhang Xian-En Zhou Ya-Feng Zhang Zhi-Ping Cass Anthony E G |
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Affiliation: | State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China. |
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Abstract: | An enzyme-linker-peptide fusion protein reporter system was constructed for sensitive analysis of affinity of peptide ligands to their receptor. An E. coli alkaline phosphatase (EAP) mutant enzyme with high catalytic activity was selected as the reporter protein. Interaction of affinity peptide and streptavidin was applied as demonstration of the method. Three affinity peptides, strep-tag I (SI), strep-tag II (SII) and streptavidin binding peptide (SBP) were genetically fused to the C-terminal of EAP respectively, with an insertion of a flexible linker peptide in between. The enzyme activity of the EAP fusions showed no obvious change. After expression and purification, the EAP-affinity peptide fusions were applied to the streptavidin modified surface. Binding of the fusions to the surface through interaction of affinity peptides to streptavidin was indicated by color generated from conversion of the substrate by EAP. The relative affinity and specificity of each affinity peptides to the immobilized streptavidin were then evaluated with high sensitivity and broad detection range. This method may be used for effective high-throughput screening of high affinity peptide from the peptide pool. |
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Keywords: | EAP, E. coli alkaline phosphatase SI, strep-tag I SII, strep-tag II SBP, streptavidin binding peptide ELISA, enzyme-linked immunosorbent assay pNPP, para-nitrophenyl phosphates PCR, polymerase chain reaction BSA, bovine serum albumin PBS, phosphate buffered saline Tc, tetracycline |
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