Phiromsak Phattanapaijitkun. Cloning, expression and polyclonal antibodies production against recombinant VP19 envelope and VP26 capsid proteins of white spot syndrome virus (WSSV) in black tiger shrimp (Penaeus monodon) . Master's Degree(Tropical Medicine). Mahidol University. : Mahidol University, 2005.
Cloning, expression and polyclonal antibodies production against recombinant VP19 envelope and VP26 capsid proteins of white spot syndrome virus (WSSV) in black tiger shrimp (Penaeus monodon)
Abstract:
White spot syndrome virus (WSSV) is the causative agent of white spot
syndrome in black tiger shrimp (P. monodon) cultured worldwide, including
Thailand. This virus was first reported in the 1980s, but major epidemics in Thailand
were reported in the 1990s. WSSV transmission can occur both horizontally and
vertically. Early detection of WSSV in infected P. monodon is an effective way to
control WSSV epidemics in shrimp culture. The objective of this study was to
produce polyclonal antibodies (PAbs) to detect white spot syndrome virus. Structural
gene of envelope protein VP19 was cloned into expression vector (pMAL-C2) and
expressed in E. coli (BL21) as a fusion protein, MBP-VP19 with a M.W. of 55.5 kDa.
For WSSV capsid protein VP26, fusion protein with 6-histidine tag, 6 x His- VP 26,
was used to generate polyclonal antibodies. The bacterial expression system allowed
the production of 10 mg of purified recombinant proteins per liter of bacterial culture.
Both recombinant proteins were used to immunize Swiss albino mice to produce
polyclonal antibody. The WSSV-specific polyclonal antibodies were characterized by
Western blot and immunohistochemistry and detected WSSV in both native and
denatured forms. The MBP-VP19 and 6xhis-VP 26 proteins obtained from this project
are useful for future vaccine development to prevent WSSV infection in shrimp
farms. The recombinant protein will be used to produce monoclonal antibodies
(MAbs) and used together with previous WSSV VP28 MAb to confirm and increase
detection sensitivity in various immunoassays, including a simple immuno-based test
kit (strip- test) and ELISA.