Ig H and L chain contributions to autoimmune specificities

Marko Z. Radic, Mary A. Mascelli, Jan Erikson, Hua Shan, Martin Weigert

Research output: Contribution to journalArticlepeer-review

208 Scopus citations


An Ig H chain expression vector has been constructed by using the V region of 3H9, an antibody that binds ssDNA, dsDNA, and cardiolipin. The H chain construct was transfected into six hybridoma cell lines expressing Ig L chains. All resulting H and L chain combinations had at least some affinity for ssDNA, whereas five also bound dsDNA to a similar degree as 3H9. The loss of dsDNA binding was correlated with a single amino acid difference between two Vκ8 L chains. A further characteristic of 3H9, its immunofluorescent staining pattern, was shared by four of the recombinant antibodies, whereas its specificity for cardiolipin was shared with five. The transfections reported here show that a Vκ3 L chain confers specificity for an RNA-associated epitope and that a Vκ21E L chain prevents cardiolipin binding. These experiments suggest that the 3H9 H chain contributes essential determinants required for binding to DNA as well as cardiolipin but that L chains can modulate or prevent this binding. L chains may also expand the specificity of a recombinant antibody.

Original languageEnglish (US)
Pages (from-to)176-182
Number of pages7
JournalJournal of Immunology
Issue number1
StatePublished - Jan 1 1991
Externally publishedYes

ASJC Scopus subject areas

  • Immunology


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