title: [Screening of the genes of hepatitis B virus PreS2 interacting proteins].
abstract: OBJECTIVE
  To screen and clone the genes of proteins in hepatocytes interacting with hepatitis B virus (HBV) PreS2 by yeast-two hybridization technique.
  
  
  METHODS
  The HBV PreS2 gene was amplified by polymerase chain reaction (PCR) and HBV PreS2 bait plasmid was constructed by using yeast-two hybridization system 3, then transformed into yeast AH109, followed by mating with yeast Y187 containing liver cDNA library plasmid in 2 YPDA medium. Diploid yeast was plated on synthetic dropout nutrient medium (SD/-Trp-Leu-Ade-His) and synthetic dropout nutrient medium (SD/-Trp-Leu-Ade-His) containing X-alpha-gal for selecting positive blue clones, then amplified by PCR, sequenced, and performed bioinformatics analysis.
  
  
  RESULTS
  HBV PreS2 gene was cloned successfully and expressed in yeast AH109.Twenty-six positive colonies were selected, among them, twelve containing metallothionein 2A, one cytochrome C oxidase II, two cytochrome P450 subfamily IV4F, two cytochrome c oxidase subunit 4 isoform 1, three albumin (ALB), one Na(+)K(+) transporting ATPase beta-1 polypeptide, two prealbumin, one lectin galactoside-binding subunit, and Two new genes with unknown function.
  
  
  CONCLUSIONS
  Genes of HBV PreS2 interacting proteins have been successfully cloned, which brings some new clues for studying the biological functions of HBV PreS2 and related proteins.
authors.affiliation: Gene Therapy Research Center, Institute of Infectious Diseases, 302nd Hospital of People's Liberation Army, Beijing 100039, China.
authors.forename: Yin-ying
authors.initials: YY
authors.lastname: Lu
authors.forename: Ke
authors.initials: K
authors.lastname: Li
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
authors.forename: Yan
authors.initials: Y
authors.lastname: Liu
authors.forename: Ye-dong
authors.initials: YD
authors.lastname: Wang
authors.forename: Jun
authors.initials: J
authors.lastname: Cheng
authors.forename: Ling-xia
authors.initials: LX
authors.lastname: Zhang
mesh_terms: D003001:Cloning, Molecular; D006514:Hepatitis B Surface Antigens / Q000235:genetics* / Q000502:physiology; D010957:Plasmids; D011498:Protein Precursors / Q000235:genetics* / Q000502:physiology; D020798:Two-Hybrid System Techniques; D015003:Yeasts / Q000235:genetics
chemical_list: D006514:Hepatitis B Surface Antigens; D011498:Protein Precursors; C050807:presurface protein 2, hepatitis B surface antigen