Cell-free expression, purification and immunoreactivity assessment of recombinant Fasciola hepatica saposin-like protein-2

Molecular Biology Reports
Marcos J Ramos-BenítezAna M Espino

Abstract

Cell free protein synthesis has become a powerful method for the high-throughput production of proteins that are difficult to express in living cells. The protein SAP2 of Fasciola hepatica (FhSAP2), which has demonstrated to be both, an excellent vaccine candidate against experimental fascioliasis and a good antigen for serodiagnosis of human chronic fascioliasis, is a typical example of a molecule that is difficult to produce. This is mainly due to its tendency to get over-expressed in inclusion bodies by prokaryotes. FhSAP2 expressed in an Escherichia coli-based expression system is poorly glycosylated, insoluble and often undergoes improper folding leading it to reduced immunogenicity. In this work, FhSAP2 was expressed in vitro using the eukaryote cell free system, TNT T7 Quick coupled transcription/translation, that has been designed for the expression of PCR-generated DNA templates. FhSAP2 was expressed in micro-volumes and purified by an affinity chromatography method, which gave a protein yield of 500 µg/ml as determined by bicinchoninic acid assay method. Circular dichroism, Western blotting and enzyme-linked immunosorbent assay analysis were used to confirm the secondary structure, purity and integrity of protein. Res...Continue Reading

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Citations

Mar 22, 2020·BioDrugs : Clinical Immunotherapeutics, Biopharmaceuticals and Gene Therapy·Srujan Kumar DondapatiStefan Kubick

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Datasets Mentioned

BETA
AF286903

Methods Mentioned

BETA
PCR
glycosylations
enzyme-linked immunosorbent assay
ELISA
electrophoresis
circular dichroism

Software Mentioned

Graphpad Prism

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