Linked Life Data

7492751

Source:http://linkedlifedata.com/resource/pubmed/id/7492751

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pubmed-article:7492751pubmed:abstractTextThe VH4-21 (V4-34) gene segment, a member of the VH4 family, is expressed early in B-cell maturation and is utilized by approximately 6% of normal adult B lymphocytes. This prevalence indicates an importance of VH4-21 in the B-cell repertoire. The gene also encodes certain autoantibodies being mandatory for pathological IgM anti-red cell antibodies directed against the I/i antigen, and also capable of encoding anti-DNA antibodies. Recognition of I/i antigen or DNA appears to be via two distinct sites on VH, with I/i binding mediated by sequences in the framework region, and DNA binding correlating with the presence of positively charged amino acids in complementarity-determining region 3. However, these positively charged residues appear to suppress the ability of the framework region to interact with I/i, rendering a single sequence monospecific for I/i or DNA. The IgM anti-DNA antibodies also recognize bacterial lipid A, whereas the anti-I/i antibodies do not, indicating that CDR3 may be involved in binding the negatively charged lipid A. Structural similarities between the DNA backbone and lipid A provide a possible explanation for this cross-reactivity. This dual recognition of bacterial antigen and autoantigen provides a potential link between infection and autoimmunity.lld:pubmed
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pubmed-article:7492751pubmed:articleTitleDual recognition of lipid A and DNA by human antibodies encoded by the VH4-21 gene: a possible link between infection and lupus.lld:pubmed
pubmed-article:7492751pubmed:affiliationTenovus Laboratory, Southampton University Hospitals, UK.lld:pubmed
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