›› 2014, Vol. 41 ›› Issue (10): 17-22.

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Cloning and Sequence Analysis of EXHC and SHETA Genes of Staphylococcus hyicus and Prediction of Protein Structure

ZHANG Le-yi, LI Yan, CAI Ru-jian, JIANG Zhi-yong, LIU Yan-ling, SONG Chang-xu   

  1. Guangdong Open Laboratory of Veterinary Public Health, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
  • Received:2014-05-26 Online:2014-10-20 Published:2014-10-29

Abstract: It was to analyze and predict the structural characteristics of EXHC and SHETA genes from Staphylococcus hyicus exfoliative toxins by bioinformatics. According to Staphylococcus hyicus exfoliative toxins EXHC and SHETA genes sequence reported in GenBank,two pairs of primers were designed to amplify EXHC and SHETA gene fragments,respectively. The fragment size of EXHC and SHETA genes of GDZC strains were 1007 and 971 bp,respectively. The nucleotide and amino acid sequences analysis showed that EXHC gene exhibited homology 100.0% with Staphylococcus hyicus Denmark strain (AF515455) and Staphylococcus sciuri Hebei strain (JF755400),while shared low homology,3.3% to 53.9% and 7.9% to 44.2% with exfoliative toxin of other Staphylococci stains based on nucleotide and amino acid sequence,respectively. There were 31 nucleotide mutations in the conserved region of SHETA gene,the nucleotide and amino acid sequence homologies with the Japan isolates (AB036768) were 96.2% and 98.4%,respectively. Using the DNAStar software to analyze the structure of proteins ecoded by EXHC and SHETA genes,the results showed that protein encoded by gene EXHC was hydrophilic protein,and protein encoded by gene SHETA was hydrophobic and poor antigenicity. This study amplified the EXHC and SHETA genes from Staphylococcus hyicus GDZC strains and predicted the protein structure successfully,and confirmed Staphylococcus hyicus from China could carry two toxins genes EXHC and SHETA,provided a theoretical basis for further study of the Staphylococcus hyicus pathogenic mechanism and interaction between toxins.

Key words: Staphylococcus hyicus; exfoliative toxins; EXHC; SHETA

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