Studies On SHSP And HSP60 Genes Of Eimeria Tenella

Avian coccidiosis that inflicts severe economic losses on the poultry industry is the major parasitic disease of poultry infected by Eimeria spp.At present,strategies of conventional control the disease have relied on prophylactic medication and immunization with live vaccines.Due to the emergence of drug resistant of parasite and potential danger of live vaccines etc,novel approaches are urgently need to study to control coccidiosis.At first,screening important parasite antigen genes are crucial for the design of novel control approaches.Eimeria tenella is one of the seven species of parasites causing avian coccidiosis.The pathopoiesia of the species is the most to chicken.To isolate and identify heat shock proteins(HSPs) genes of E. tenella sporozoy stage may be providing important rationales for studying new vaccines and drugs against coccidiosis.1.Cloning and analysis HSPs genes of E.tenellaBased on ESTs of differentially expressed genes of sporulated oocysts and sporozoites recerived by SSH and cDNA microarray,two novel genes including a complete open reading frame were obtained with RACE technique.One new gene was up-regulated in sporulated oocysts of E.tenella,named as BW1-B02(GenBank accession No.GQ169724),another was up-regulated in sporozoites,named as ZB2-D07(GenBank accession No.FJ911605).With bioinfomatics analysis software,property and function of two proteins encoded by these novel genes were predicted,including physical and chemical property,trans-membrane structure,antigen site,conserved domain,function site and homologous protein search.These results indicated that one protein encoded by BW1-B02(GenBank accession No. GQ169724) is the sHSP gene,and the other one encoded by ZB2-D07(GenBank accession No. FJ911605) is the HSP60 gene.These results provided important information to isolate useful genes of genetically engineering vaccines and novel drugs to control coccidiosis.2.Expression of HSPs genes of E.tenella in E.coli and immunogenicity analysis of the recombinant proteinHSPs genes of E.tenella(GQ169724,FJ911605) were ligated to prokaryotic expression vector pET-28a(+) and constructed recombinant plasmids pET28a(+) -Et sHSP,pET28a(+) -Et HSP60 successfully,respectively.These recombinant plasmids were transformed into BL21(DE3) for expression.After induction by IPTG,recombinant expressed proteins were identified by SDS-PAGE. Most of pET28a(+) -Et sHSP recombinant proteins was soluble in cytoplasm,the other fusion protein pET28a(+)-Et HSP60 were expressed in the form of inclusion bodies.Two fusion proteins were purified successfully with His resin,respectively.Western-blot revealed that two proteins were native antigens.