title: [Construction of the pyruvate oxidase gene deficiency variant strain of Streptococcus oralis].
abstract: OBJECTIVE
  The purpose of this study is to construct a pyruvate oxidase gene deficiency variant strain of Streptococcus oralis (S. oralis).
  
  
  METHODS
  The sopox gene, which was got using polymerase chain reaction (PCR), and the 130-basepair segment of which was cut down with endonuclease BamHI, and transferred into S. oralis (ATCC10557) by using electrotransformation. The authors obtained a variant strain of S. oralis, and then the catalase activity of the first culture and 3-4 subcultures was examined.
  
  
  RESULTS
  The authors obtained a pyruvate oxidase gene deficiency variant strain of S. orlis. The catalase activity examination showed that the ability of producing H2 O2 of the variant strain of S. orlis declined, whose catalase activity was between those of the positive control (ATCC10557) and the negative control (Escherichia coli, JM109). But the produced H2 O2 quantity of their subcultures was less than that of the negative control.
  
  
  CONCLUSIONS
  The construction of the pyruvate oxidase gene deficiency variant strain of Streptococcus oralis is successful.
authors.affiliation: College of Stomatology, West China University of Medical Sciences.
authors.forename: Ruoyu
authors.initials: R
authors.lastname: Pang
authors.forename: Rong
authors.initials: R
authors.lastname: Zhang
authors.forename: Yunhui
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jincai
authors.initials: J
authors.lastname: Zhang
mesh_terms: D003001:Cloning, Molecular; D005798:Genes, Bacterial; D005818:Genetic Engineering; D014644:Genetic Variation; D016133:Polymerase Chain Reaction; D011771:Pyruvate Oxidase / Q000235:genetics*; D019533:Streptococcus oralis / Q000201:enzymology / Q000235:genetics*
chemical_list: D011771:Pyruvate Oxidase