Jaran Nabnuengsap. Preparation and characterization of recombinant Plp B protein from Pasteurella multocida A:1. Master's Degree(Biopharmaceutical Sciences ). Mahidol University. Mahidol University Library and Knowledge Center. : Mahidol University, 2009.
Preparation and characterization of recombinant Plp B protein from Pasteurella multocida A:1
การเตรียมและการศึกษาเอกลักษณ์ของรีคอมบิแนนท์โปรตีน Plp B จากเชื้อ Pasteurella multocida A:1
Abstract:
Pasteurella multocida is a gram-negative bacterial pathogen known to affect a
wide range of domestic and wild animals. The increasing incidence of P. multocida
isolated from cases of fowl cholera and hemorrhagic septicemia in most parts of the
world has led to a renewed interest in this pathogen as well as in the development of
vaccines. The currently available vaccines, bacterins and modified live vaccines, have
limited efficacy. P. multocida has been demonstrated to express an antigen that
induces cross protection against different serotypes. The purified cross-protective
antigen of P. multocida was consistent with the plpB gene listed in the National Center
for Biotechnology Information database for P. multocida. In this study, the PCR
primers were designed based on the nucleotide sequence of P. multocida, Pm70 which
was already published and used to amplify the fragment of plpB gene from P.
multocida A:1 (FC-Pakchong). The plpB gene could also be detected in P. multocida
NIAH DU1551/97 (A:1) and P. multocida NIAH D1275/27 (A:3,4); that were most
associated with fowl cholera. The plpB gene, consisting of 831 base pairs was cloned
and expressed. The purified PCR product was inserted into the pGEX-5X-1 plasmid
which was carrying a gene encoding for GST protein. The expression of recombinant
GST-tagged PlpB fusion protein in Escherichia coli was detected by sodium dodecyl
sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and purified by immobilized
glutathione affinity column chromatography. The purified recombinant GST-PlpB
fusion protein showed a major band migrated at about 63 kDa on SDS-PAGE gel
which was an approximate size of the fusion protein. (After cleavage by factor Xa,
GST tag was cleaved. The separated protein was presented at about 36 kDa.) Three
concentrations of recombinant GST-PlpB fusion protein (50, 100, and 200 μg) were
tested for the toxicity in mice. The results showed no toxicity in mice at the highest
tested concentration (200 μg) of the protein. Thus, the recombinant GST-PlpB fusion
protein, successfully cloned and expressed in this study, has a potential to be further
developed as a subunit vaccine against P. multocida infection