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Structural determinants in the sequences of immunoglobulin variable domain
C Chothia1, I Gelfand, A Kister
1MRC Laboratory of Molecular Biology, Hills Road, Cambridge, CB2 2QH, England.
Journal of Molecular Biology
|June 10, 1998
Summary
This study reveals that immunoglobulin variable domains share a conserved core structure, with sequence variations primarily affecting surface regions and turns, influencing protein folding and function.
Area of Science:
- Structural biology
- Immunology
- Bioinformatics
Background:
- Immunoglobulin variable domains (V domains) are crucial for antibody function.
- Understanding the sequence-structure relationship in V domains is key to protein engineering and drug design.
Purpose of the Study:
- To elucidate the general relationship between the amino acid sequence and the three-dimensional structure of immunoglobulin V domains.
- To identify conserved structural elements and sequence patterns within V domains.
Main Methods:
- Analysis of approximately 5300 expressed V domain sequences.
- Examination of atomic structures of V domains.
- Comparison with human germline gene segments.
Main Results:
- A conserved core of 76 residues with a stable main-chain conformation was identified in all V domain structures.
- Sequence analysis revealed conserved residues at specific sites within the core, crucial for structural integrity.
- Conformational variations are concentrated in hypervariable regions and surface turns, accommodating sequence diversity.
Conclusions:
- The conserved core dictates the fundamental V domain fold, while surface regions allow for functional diversification.
- Sequence conservation patterns correlate with the structural role of residues, distinguishing core, buried, and surface sites.
- This work provides insights into protein structure prediction and the evolution of immunoglobulin diversity.