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Polyclonal Antibodies in Microplates to Predict the Maximum Adsorption Activities of Enzyme/Mutants from Cell Lysates

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Abstract

With microplate-immobilized polyclonal antibodies against a starting enzyme or its active mutant bearing consistent accessible epitopes, the maximum activity of an adsorbed enzyme/mutant (Vs) was predicted for comparison to recognize weakly-positive mutants. Rabbit antisera against Escherichia coli alkaline phosphatase (ECAP) were fractionated with 33% ammonium sulfate to yield crude polyclonal antibodies for conventional immobilization in 96-well microplates. The response curve of the activities of ECAP/mutant adsorbed by the immobilized polyclonal antibodies to protein quantities from a cell lysate was fit to an approximation model to predict Vs. With 0.4 μg crude polyclonal antibody for immobilization, Vs was consistent for ECAP in cell lysates bearing fourfold differences in its apparent specific activities when its abundance was greater than 0.9%. The ratio of Vs of the mutant R168K to that of ECAP was 1.5 ± 0.1 (n = 2), consistent with that of their specific activities after affinity purification. Unfortunately, the prediction of Vs with polyclonal antibodies that saturated microplate wells was ineffective to Pseudomonas aeruginosa arylsulfatase bearing less than 2% specific activity of ECAP. Therefore, with microplate-immobilized polyclonal antibodies to adsorb enzyme/mutants from cell lysates, high-throughput prediction of Vs was practical to recognize weakly-positive mutants of starting enzymes bearing fairly-high activities.

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Abbreviations

BSA:

Bovine serum albumin

ECAP:

Escherichia coli alkaline phosphatase

ELISA:

Enzyme-linked-immunoabsorbent-assay

HTP:

High-throughput

PAAS:

Pseudomonas Aeruginosa arylsulfatase

Tris:

Tris-(hydroxymethyl)-aminomethane

Vs:

The maximum adsorption activity

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Acknowledgements

This work was supported in part by the National Natural Science Foundation of China (Nos. 31570862, and 21402108), and the Education Ministry of China (No. 20125503110007).

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Correspondence to Fei Liao.

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The authors declare that they have no conflicts of interest.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Yiran Feng and Xiaolan Yang have contributed equally to this work.

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Feng, Y., Yang, X., Wang, D. et al. Polyclonal Antibodies in Microplates to Predict the Maximum Adsorption Activities of Enzyme/Mutants from Cell Lysates. Protein J 36, 212–219 (2017). https://doi.org/10.1007/s10930-017-9716-z

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