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The peptide binding specificity of HLA-B27 subtypes
N Tanigaki1, D Fruci, E Vigneti
1Istituto di Biologia Cellulare, CNR, Roma, Italy.
Immunogenetics
|January 1, 1994
Summary
This study reveals that various Human Leukocyte Antigen B27 (HLA-B27) subtypes can bind a shared set of peptides, suggesting a common mechanism in ankylosing spondylitis pathogenesis.
Area of Science:
- Immunogenetics
- Molecular Biology
- Rheumatology
Background:
- The Human Leukocyte Antigen B27 (HLA-B27) gene is strongly associated with ankylosing spondylitis.
- Understanding HLA-B27 peptide binding is crucial for elucidating disease mechanisms.
Purpose of the Study:
- To investigate the direct binding of synthetic nonapeptides to five HLA-B27 subtypes.
- To identify common and unique peptide anchor residue motifs recognized by different HLA-B27 subtypes.
Main Methods:
- Synthesis of twenty-six nonapeptides derived from human HSP89 alpha, P53, and MBP.
- Isolation of alpha chains from five HLA-B27 subtypes (B*2701, B*2703, B*2704, B*2705, B*2706).
- Measurement of peptide binding using the HLA class I alpha chain refolding assay.
Main Results:
- All tested B27 subtypes demonstrated binding to a common set of peptides with diverse anchor motifs.
- Motifs R-K, R-R, and H-R were accepted by B*2703, B*2704, and B*2706, but not B*2701.
- Motifs R-H, R-L, R-A, R-F, and R-G were accepted by all B27 subtypes tested.
Conclusions:
- The B27 subtypes exhibit cross-peptide binding capabilities, recognizing shared and distinct anchor motifs.
- This cross-peptide binding is consistent with the arthritogenic peptide hypothesis in ankylosing spondylitis pathogenesis.