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H3-rules: identification of CDR-H3 structures in antibodies

H Shirai1, A Kidera, H Nakamura

  • 1Department of Bioinformatics, Biomolecular Engineering Research Institute, Suita, Osaka, Japan.

FEBS Letters
|July 31, 1999
PubMed

Insights

We developed H3-rules to predict antibody heavy chain CDR-H3 tertiary structure from its amino acid sequence. These rules, derived from 100 antibody structures, accurately identify structural patterns and highlight the role of basic residues.

Area of Science:

  • Immunology
  • Structural Biology
  • Bioinformatics

Background:

  • The third complementarity determining region of the antibody heavy chain (CDR-H3) is crucial for antigen binding.
  • Predicting the tertiary structure of CDR-H3 from its amino acid sequence is challenging but essential for antibody engineering.

Purpose of the Study:

  • To propose and validate a set of rules ('H3-rules') for predicting the tertiary structure of antibody heavy chain CDR-H3 segments based on their amino acid sequences.

Main Methods:

  • Analysis of 100 CDR-H3 segments from well-determined crystal structures.
  • Identification of sequence-structure relationships in 55 segments.
  • Validation of the derived 'H3-rules' using the remaining 45 segments.

Main Results:

  • Distinctive relationships between CDR-H3 amino acid sequences and their tertiary structures were identified.
  • The 'H3-rules' were successfully developed and verified.
  • Specific positions with basic residues were found to be significant signals influencing CDR-H3 structure, capable of forming salt bridges and adopting unusual conformations.

Conclusions:

  • The 'H3-rules' provide a method for predicting CDR-H3 tertiary structure from sequence.
  • Understanding these sequence-structure relationships aids in antibody design and function prediction.
  • The influence of basic residues on CDR-H3 conformation is a key factor to consider.

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