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Proteolysis of purified IgGs by human and bacterial enzymes in vitro and the detection of specific proteolytic fragments of endogenous IgG in rheumatoid synovial fluid

Ryan, Mary H; Petrone, Diane; Nemeth, Jennifer F; Barnathan, Evan; Björck, Lars LU and Jordan, Robert E (2008) In Molecular Immunology 45(7). p.1837-1846
Abstract
A comparative in vitro survey of physiologically relevant human and microbial proteinases defined a number of enzymes that induced specific hinge domain cleavage in human IgG1. Several of these proteinases have been associated with tumor growth, inflammation, and infection. A majority of the identified proteinases converted IgG to F(ab')(2), and a consistent feature of their action was a transient accumulation of a single-cleaved intermediate (scIgG). The scIgG resulted from the relatively rapid cleavage of the first hinge domain heavy chain, followed by a slower cleavage of the second chain to separate the Fc domain from F(ab')(2). Major sites of enzymatic cleavage were identified or confirmed from the mass of the F(ab')(2) or Fab... (More)
A comparative in vitro survey of physiologically relevant human and microbial proteinases defined a number of enzymes that induced specific hinge domain cleavage in human IgG1. Several of these proteinases have been associated with tumor growth, inflammation, and infection. A majority of the identified proteinases converted IgG to F(ab')(2), and a consistent feature of their action was a transient accumulation of a single-cleaved intermediate (scIgG). The scIgG resulted from the relatively rapid cleavage of the first hinge domain heavy chain, followed by a slower cleavage of the second chain to separate the Fc domain from F(ab')(2). Major sites of enzymatic cleavage were identified or confirmed from the mass of the F(ab')(2) or Fab fragments and/or the amino-terminal amino acid sequence of the Fc for each enzyme including human matrix metalloprotemases (MMPs) 3 and 12, human cathepsin G, human neutrophil elastase (Fab), staphylococcal glutamyl endopeptidase I and streptococcal immunoglobulin-degrading enzyme (Ides). The cleavage sites in IgG1 by MMP-3, cathepsin G and Ides were used to guide the synthesis of peptide analogs containing the corresponding carboxy-termini to be used as immunogens in rabbits. Rabbit antibodies were successfully generated that showed selective binding to different human F(ab')(2)s and other hinge-cleavage fragments, but not to intact IgG. In Western blotting studies of synovial fluids from individuals with rheumatoid arthritis, the rabbit antibodies yielded patterns consistent with the presence of endogenous IgG fragments including F(ab')(2) and the single-cleaved IgG intermediate. The detection in synovial fluid of IgG fragments similar to those observed in the in vitro biochemical studies suggests that proteolysis of IgG may contribute to localized immune dysfunction in inflammatory environments. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
hinge domain, proteolytic enzyme, antibodies, IgG, synovial fluid
in
Molecular Immunology
volume
45
issue
7
pages
1837 - 1846
publisher
Pergamon
external identifiers
  • wos:000254260500002
  • scopus:39149138479
ISSN
1872-9142
DOI
10.1016/j.molimm.2007.10.043
language
English
LU publication?
yes
id
97d64993-e2df-42c4-92c9-e139c047918a (old id 1184921)
date added to LUP
2008-09-02 14:34:33
date last changed
2017-07-30 04:15:17
@article{97d64993-e2df-42c4-92c9-e139c047918a,
  abstract     = {A comparative in vitro survey of physiologically relevant human and microbial proteinases defined a number of enzymes that induced specific hinge domain cleavage in human IgG1. Several of these proteinases have been associated with tumor growth, inflammation, and infection. A majority of the identified proteinases converted IgG to F(ab')(2), and a consistent feature of their action was a transient accumulation of a single-cleaved intermediate (scIgG). The scIgG resulted from the relatively rapid cleavage of the first hinge domain heavy chain, followed by a slower cleavage of the second chain to separate the Fc domain from F(ab')(2). Major sites of enzymatic cleavage were identified or confirmed from the mass of the F(ab')(2) or Fab fragments and/or the amino-terminal amino acid sequence of the Fc for each enzyme including human matrix metalloprotemases (MMPs) 3 and 12, human cathepsin G, human neutrophil elastase (Fab), staphylococcal glutamyl endopeptidase I and streptococcal immunoglobulin-degrading enzyme (Ides). The cleavage sites in IgG1 by MMP-3, cathepsin G and Ides were used to guide the synthesis of peptide analogs containing the corresponding carboxy-termini to be used as immunogens in rabbits. Rabbit antibodies were successfully generated that showed selective binding to different human F(ab')(2)s and other hinge-cleavage fragments, but not to intact IgG. In Western blotting studies of synovial fluids from individuals with rheumatoid arthritis, the rabbit antibodies yielded patterns consistent with the presence of endogenous IgG fragments including F(ab')(2) and the single-cleaved IgG intermediate. The detection in synovial fluid of IgG fragments similar to those observed in the in vitro biochemical studies suggests that proteolysis of IgG may contribute to localized immune dysfunction in inflammatory environments.},
  author       = {Ryan, Mary H and Petrone, Diane and Nemeth, Jennifer F and Barnathan, Evan and Björck, Lars and Jordan, Robert E},
  issn         = {1872-9142},
  keyword      = {hinge domain,proteolytic enzyme,antibodies,IgG,synovial fluid},
  language     = {eng},
  number       = {7},
  pages        = {1837--1846},
  publisher    = {Pergamon},
  series       = {Molecular Immunology},
  title        = {Proteolysis of purified IgGs by human and bacterial enzymes in vitro and the detection of specific proteolytic fragments of endogenous IgG in rheumatoid synovial fluid},
  url          = {http://dx.doi.org/10.1016/j.molimm.2007.10.043},
  volume       = {45},
  year         = {2008},
}