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Infection and Immunity, June 1999, p. 2769-2775, Vol. 67, No. 6
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Cross-Reactivity between the Rheumatoid Arthritis-Associated Motif EQKRAA and Structurally Related Sequences Found in Proteus mirabilis

Harmale Tiwana,1 Clyde Wilson,1 Alison Alvarez,1 Ramadan Abuknesha,2 Sukhvinder Bansal,3 and Alan Ebringer1,4,*

Infection and Immunity Group1 and Biochemistry Section,2 Division of Life Sciences, and Department of Pharmacy,3 King's College, and Department of Rheumatology, UCL School of Medicine, Middlesex Hospital,4 London, United Kingdom

Received 30 November 1998/Returned for modification 12 January 1999/Accepted 3 March 1999

Cross-reactivity or molecular mimicry may be one of the underlying mechanisms involved in the etiopathogenesis of rheumatoid arthritis (RA). Antiserum against the RA susceptibility sequence EQKRAA was shown to bind to a similar peptide ESRRAL present in the hemolysin of the gram-negative bacterium Proteus mirabilis, and an anti-ESRRAL serum reacted with EQKRAA. There was no reactivity with either anti-EQKRAA or anti-ESRRAL to a peptide containing the EDERAA sequence which is present in HLA-DRB1*0402, an allele not associated with RA. Furthermore, the EQKRAA and ESRRAL antisera bound to a mouse fibroblast transfectant cell line (Dap.3) expressing HLA-DRB1*0401 but not to DRB1*0402. However, peptide sequences structurally related to the RA susceptibility motif LEIEKDFTTYGEE (P. mirabilis urease), VEIRAEGNRFTY (collagen type II) and DELSPETSPYVKE (collagen type XI) did not bind significantly to cell lines expressing HLA-DRB1*0401 or HLA-DRB1*0402 compared to the control peptide YASGASGASGAS. It is suggested here that molecular mimicry between HLA alleles associated with RA and P. mirabilis may be relevant in the etiopathogenesis of the disease.

* Corresponding author. Mailing address: Infection and Immunity Group, Division of Life Sciences, King's College, Campden Hill Rd., London, W8 7AH, United Kingdom. Phone: 0171-333-4302. Fax: 0171-333-4500. E-mail: alan.ebringer{at}kcl.ac.uk.

Infection and Immunity, June 1999, p. 2769-2775, Vol. 67, No. 6
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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