title: [Cloning and sequence analysis of UreB of Helicobacter pylori isolated from children].
abstract: OBJECTIVE
  To clone UreB gene of Helicobacter pylori (H. pylori) isolated from children to pGEX-4T-1 expression plasmid, and do sequence analysis.
  
  
  METHODS
  A pair of specific primer was designed according to H. pylori UreB gene in the GenBank. Using H. pylori strains isolated from children as a template, a UreB gene was obtained by PCR. After EcoR I and Not I digestion, the PCR production was linked with pGEX-4T-1 which was digested with the same enzymes. The recombinant plasmid was transformed into E.coli BL21 and identified by double enzyme digestion and sequence analysis. The sequence results were compared with the gene sequence in the GenBank.
  
  
  RESULTS
  A UreB gene was successfully amplified from children's H. pylori strain GZCH1. It was 1710 bp in size. The objective band was identified by double enzyme digestion. DNA sequence showed that UreB was in the correct open reading frame. The sequence comparison analysis showed that DNA and amino acid sequence identities of UreB gene with other strains were 98%. The sequence of UreB of H. pylori strain GZCH1 was submitted to GenBank (accession number:FJ455126).
  
  
  CONCLUSIONS
  UreB of H. pylori strain GZCH1 is successfully cloned to pGEX-4T-1, which provides a basis for research of oral H. pylori vaccine.
authors.affiliation: Guangzhou Women and Children's Medical Center, Guangzhou 510120, China. zhouzhenwen28@126.com
authors.forename: Zhen-Wen
authors.initials: ZW
authors.lastname: Zhou
authors.forename: Qiu-Lian
authors.initials: QL
authors.lastname: Deng
authors.forename: Hui-Min
authors.initials: HM
authors.lastname: Xia
authors.forename: Lan-Lan
authors.initials: LL
authors.lastname: Geng
authors.forename: Wei-He
authors.initials: WH
authors.lastname: Liang
authors.forename: Yong-Qiang
authors.initials: YQ
authors.lastname: Xie
authors.forename: Yong
authors.initials: Y
authors.lastname: Huang
authors.forename: Si-Tang
authors.initials: ST
authors.lastname: Gong
mesh_terms: D000595:Amino Acid Sequence; D001428:Bacterial Vaccines / Q000276:immunology; D002648:Child; D003001:Cloning, Molecular; D016480:Helicobacter pylori / Q000201:enzymology* / Q000276:immunology; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D014510:Urease / Q000737:chemistry / Q000235:genetics* / Q000276:immunology
chemical_list: D001428:Bacterial Vaccines; D014510:Urease