Vaccine efficacy of glyceraldehyde-3-phosphate dehydrogenase (GAPDH) from Edwardsiella ictaluri against E. tarda in tilapia

The Journal of General and Applied Microbiology
Thanh Trung CaoShih-Chu Chen

Abstract

Glyceraldehyde-3-phosphate dehydrogenase (GAPDH), derived from the outer-membrane protein (OMP) fraction, has been used as a potential candidate for vaccine development. The gene-encoding 37 kDa GAPDH outer membrane protein (OMP) from Edwardsiella ictaluri was amplified using polymerase chain reaction (PCR) and was cloned and expressed in Escherichia coli BL21 (DE3). Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE), Western blotting, and nucleotide and amino acid sequencing were used to analyze the expressed antigenic protein and gene encoding this protein. Comparative DNA and protein sequence analysis of GAPDH from E. ictaluri GAPDHs from several Gram-negative bacterial species within the Enterobacteriaceae family revealed that the GAPDHs within this group are highly conserved and share a sequence similarity of 75-100% with E. ictaluri GDPDH. Rabbit antiserum raised against the E. ictaluri recombinant GAPDH (rGAPDH) protein recognized purified GADPH, indicating that it has a strong immunogenicity. Tilapia fish were intraperitoneally immunized with formalin-killed E. ictaluri whole cells, and rGAPDH (30 μg fish(-1)) from E. ictaluri, both of which were emulsified in ISA 763A adjuvant. At 3 months after immun...Continue Reading

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