title: [Screening and characterization of human phage Fab antibody gene to prostate specific membrane antigen].
abstract: OBJECTIVE
  To screen and characterize the variable region gene about prostate specific membrane antigen (PSMA) of the Chinese Fab fragment, and to establish a new approach to researches on PSMA and prostate gene therapy.
  
  
  METHODS
  We used purified PSMA protein as antigen, stuck it on the ELISA plate and scanned the phage Fab fragment antibody library by phage display technology. After five cycles of "absorbing-elution-amplification", we got the Fab fragment phage antibody of PSMA with high antigen binding ability and specificity, and tested it with immunodetection and sequencing.
  
  
  RESULTS
  The sequence of Fd fragment was 696 base pairs encoding 232 amino-acid residues, with 98% homological similarity to the human immunoglobulin gamma chain, while the light chain was constructed by 630 base pairs encoding 210 amino-acid residues, with 93% homological similarity to kappa chain.
  
  
  CONCLUSIONS
  Using phage display technology, we obtained the gene sequence of Fab antibody fragment specific to PSMA, and the antibody gene has the classic structural features of immunoglobulin light chain and heavy chain. The coding output of the antibody gene has the specificity and immunological competence to PSMA.
authors.affiliation: Department of Urology, Second Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510120, China. huanghai257@126.com
authors.forename: Hai
authors.initials: H
authors.lastname: Huang
authors.forename: Jian
authors.initials: J
authors.lastname: Huang
authors.forename: Tian-Xin
authors.initials: TX
authors.lastname: Lin
authors.forename: Ke-Wei
authors.initials: KW
authors.lastname: Xu
authors.forename: Zheng-Hui
authors.initials: ZH
authors.lastname: Guo
authors.forename: Chun
authors.initials: C
authors.lastname: Jiang
authors.forename: Jin-Li
authors.initials: JL
authors.lastname: Han
mesh_terms: D003001:Cloning, Molecular; D004797:Enzyme-Linked Immunosorbent Assay; D005815:Genetic Code; D006801:Humans; D007140:Immunoglobulin Fab Fragments / Q000235:genetics*; D007135:Immunoglobulin Variable Region / Q000235:genetics*; D008297:Male; D019151:Peptide Library; D017430:Prostate-Specific Antigen / Q000276:immunology*
chemical_list: D007140:Immunoglobulin Fab Fragments; D007135:Immunoglobulin Variable Region; D019151:Peptide Library; D017430:Prostate-Specific Antigen