Institutional Research Information Service
UCL Logo
Please report any queries concerning the funding data grouped in the sections named "Externally Awarded" or "Internally Disbursed" (shown on the profile page) to your Research Finance Administrator. Your can find your Research Finance Administrator at https://www.ucl.ac.uk/finance/research/rs-contacts.php by entering your department
Please report any queries concerning the student data shown on the profile page to:

Email: portico-services@ucl.ac.uk

Help Desk: http://www.ucl.ac.uk/ras/portico/helpdesk
Publication Detail
Use of phage surface expression to analyze regions of human V4-34(VH4-21)-encoded IgG autoantibody required for recognition of DNA: no involvement of the 9G4 idiotope.
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Mockridge CI, Chapman CJ, Spellerberg MB, Isenberg DA, Stevenson FK
  • Publication date:
  • Pagination:
    2449, 2454
  • Journal:
    J Immunol
  • Volume:
  • Issue:
  • Status:
  • Country:
    United States
  • Print ISSN:
  • Language:
  • Keywords:
    Amino Acid Sequence, Antibodies, Antinuclear, Bacteriophage M13, Binding, Competitive, DNA, Genes, Immunoglobulin, Genetic Vectors, Humans, Immunoglobulin Fab Fragments, Immunoglobulin G, Immunoglobulin Heavy Chains, Immunoglobulin Idiotypes, Immunoglobulin Variable Region, Molecular Sequence Data
The V4-34 gene encodes the majority of autoanti-red cell Abs of I/i specificity. It also encodes a proportion of autoanti-DNA Abs found in patients with systemic lupus erythematosus. Nucleotide sequence analysis of mAbs that use this gene has indicated a role for CDR3 in discrimination between these autoantigens. Specifically, anti-DNA activity may require basic amino acids, such as arginine, found in this region. To investigate this requirement, we have expressed VH and VL sequences from a patient's IgG anti-DNA mAb, as Fab molecules at the surface of phage. Expressed Fab bound strongly to DNA, whereas control VH and VL pairs from an anti-red cell mAb did not. Replacement of the homologous mutated V4-34 sequence by germ-line sequence did not affect binding, indicating that somatic mutations in VH did not contribute significantly. In contrast, replacement of the basic CDR3 by an anti-red cell CDR3 abrogated anti-DNA activity, confirming its major role. However, an influence of VL was revealed by replacing homologous mutated V kappa IIIb by an unmutated V kappa IIIb sequence, reducing binding by approximately 50%. This influence was apparent only with homologous VH since the mutated V kappa was unable to generate anti-DNA activity when combined with anti-red cell VH. The 9G4 idiotope, which arises from FWR1, was expressed by all constructs. Substitution of Trp by Ser at position 7 in FWR11 caused complete loss of idiotope expression, with no effect on recognition of DNA, indicating no influence of idiotope expression on anti-DNA activity. Phage surface expression provides a powerful and rapid technique for assessing sequences relevant for Ab specificity or idiotope expression.
Publication data is maintained in RPS. Visit https://rps.ucl.ac.uk
 More search options
UCL Researchers
University College London - Gower Street - London - WC1E 6BT Tel:+44 (0)20 7679 2000

© UCL 1999–2011

Search by