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Publication Detail
Expression of the Fabs of human auto-antibodies in Escherichia coli: optimization and determination of their fine binding characteristics and cross-reactivity
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Kumar S, Kalsi J, Latchman DS, Pearl LH, Isenberg DA
  • Publication date:
    04/05/2001
  • Pagination:
    527, 539
  • Journal:
    Journal of Molecular Biology
  • Volume:
    308
  • Issue:
    3
  • Print ISSN:
    0022-2836
  • Keywords:
    Autoantibodies, BINDING, characteristics, cross-reactivity, Escherichia coli, ESCHERICHIA-COLI, expression, MB, optimization, activity, Animal, Anti-cardiolipin, anti-DNA, antibodies, Antibodies, Antinuclear, Monoclonal, Antibody, Antibody Specificity, ANTIGEN, As, Autoantibodies, Autoantigens, biosynthesis, Blood, Blood Proteins, Blotting, Western, cardiolipin, Cardiolipins, Cattle, CHAIN, chains, CHLORIDE, Condition, Cross Reactions, culture, difference, DNA, drug effects, ELISA, Enzyme-Linked Immunosorbent Assay, FRAGMENT, FRAGMENTS, genetics, heavy chain, hybrid, IM, Immunoassay, immunoassays, IMMUNOGLOBULIN, IMMUNOGLOBULINS, Immunoglobulins, Fab, Heavy-Chain, lambda-Chain, immunology, IMPROVEMENT, in vivo, in-vivo, isolation & purification, LA, LIGHT, LIGHT-CHAIN, Lupus Erythematosus, Systemic, May, modulator, Osmolar Concentration, pathogenicity, peptide, Peptide Fragments, pharmacology, phosphate, Phosphates, physiopathology, PROTEIN, Protein Expression, Proteins, QUALITY, QUANTITY, recombinant, Recombinant Proteins, Relative, report, Rheumatology, SERA, serum, Sodium, Sodium Chloride, SPECIFICITIES, SPECIFICITY, Support, Non-U.S.Gov't, vivo, yield
  • Notes:
    UI - 21226885 LA - eng RN - 0 (Antibodies, Antinuclear) RN - 0 (Antibodies, Monoclonal) RN - 0 (Autoantibodies) RN - 0 (Autoantigens) RN - 0 (Blood Proteins) RN - 0 (Cardiolipins) RN - 0 (Immunoglobulins, Fab) RN - 0 (Immunoglobulins, Heavy-Chain) RN - 0 (Immunoglobulins, lambda-Chain) RN - 0 (Peptide Fragments) RN - 0 (Phosphates) RN - 0 (Recombinant Proteins) RN - 0 (Sm antigen) RN - 7647-14-5 (Sodium Chloride) RN - 9007-49-2 (DNA) PT - Journal Article DA - 20010430 IS - 0022-2836 SB - IM CY - England
Abstract
The Fabs of three human auto-antibodies (B3/33H11, anti-DNA; UK4, anti- phospholipid) and six related hybrids have been cloned and expressed in Escherichia coli, and their relative binding to single-stranded or double-stranded DNA or to cardiolipin has been assessed in the presence of modulators (salts and serum). We describe optimized conditions that have led to significant improvement in the quality and quantity of the purified auto-antibodies. Protein expression of the assembled and functionally active Fabs was achievable with a yield of up to 5 to 9 mg/l of culture. The comparative DNA/cardiolipin-binding analyses of the nine Fabs in the presence of modulators demonstrated that B3 and 33H11 L chains possess both anti-DNA and anti-cardiolipin activities. This is the first report of the demonstration that both anti-DNA and anti-cardiolipin activities may lie on the same light chain of a human auto-antibody. We provide evidence that the auto-antibodies that appeared to be similar, in that they bound DNA or cardiolipin in conventional ELISA immunoassays, exhibited significant difference in their cross-reactivity and binding to the antigen in the presence of modulators. Such auto- antigen specificity and/or cross-reactivity may dictate the potential of an auto-antibody to cause pathogenicity and may provide an explanation as to why apparently similar auto-antibodies behave differently in vivo
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