Cited by 382Protein Structure and DynamicsMonoclonal and Polyclonal Antibodies ResearchEnzyme Structure and Function

A new clustering of antibody CDR loop conformations

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North, Benjamin, Lehmann, Andreas, Dunbrack, Roland L.·2011·Journal of Molecular Biology

Abstract

Previous analyses of the complementarity-determining regions (CDRs) of antibodies have focused on a small number of "canonical" conformations for each loop. This is primarily the result of the work of Chothia and coworkers, most recently in 1997. Because of the widespread utility of antibodies, we have revisited the clustering of conformations of the six CDR loops with the much larger amount of structural information currently available. In this work, we were careful to use a high-quality data set by eliminating low-resolution structures and CDRs with high B-factors or high conformational energies. We used a distance function based on directional statistics and an effective clustering algorithm with affinity propagation. With this data set of over 300 nonredundant antibody structures, we were able to cover 28 CDR-length combinations (e.g., L1 length 11, or "L1-11" in our CDR-length nomenclature) for L1, L2, L3, H1, and H2. The Chothia analysis covered only 20 CDR-lengths. Only four of these had more than one conformational cluster, of which two could easily be distinguished by gene source (mouse/human; κ/λ) and one could easily be distinguished purely by the presence and the positions of Pro residues (L3-9). Thus, using the Chothia analysis does not require the complicated set of "structure-determining residues" that is often assumed. Of our 28 CDR-lengths, 15 have multiple conformational clusters, including 10 for which the Chothia analysis had only one canonical class. We have a total of 72 clusters for non-H3 CDRs; approximately 85% of the non-H3 sequences can be assigned to a conformational cluster based on gene source and/or sequence. We found that earlier predictions of "bulged" versus "nonbulged" conformations based on the presence or the absence of anchor residues Arg/Lys94 and Asp101 of H3 have not held up, since all four combinations lead to a majority of conformations that are bulged. Thus, the earlier analyses have been significantly enhanced by the increased data. We believe that the new classification will lead to improved methods for antibody structure prediction and design.

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Crossref · 10.1016/j.jmb.2010.10.030

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  • CDR-H3 loops have high conformational diversity, even in cases where sequence similarity is high, and so CDR-H3 modeling is a significantly less constrained, more difficult problem.

    “Conversely, CDR-H3 loops have high conformational diversity, even in cases where sequence similarity is high [37], and so CDR-H3 modeling is a significantly less constrained, more difficult problem.”

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Research works printed but not linked: 2

  1. [11]Martin AC Thornton JM Structural families in loops of homologous proteins: automatic classification, modelling and application to antibodies J Mol Biol 1996 263 800 15 8947577
  2. [38]Mardia KV Jupp PE Directional Statistics 2000 Wiley Series in Probability and Statistics, Wiley London

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Authors
North, B., Lehmann, A., & Dunbrack, R. L.
Affiliations
Fox Chase Cancer Center (US)
Corresponding author
Dunbrack, Roland L.
Venue
Journal of Molecular Biology
Publisher
Elsevier BV
Published
2011-02
Volume
406
Issue
2
Pages
228-256
ISSN
0022-2836 (ISSN-L)
OpenAlex
W1978499958
Cited by
380
References
38
Citations by year
2026: 12 · 2025: 14 · 2024: 24 · 2023: 22 · 2022: 24 · 2021: 29 · 2020: 33 · 2019: 39 · 2018: 25 · 2017: 29 · 2016: 24 · 2015: 27 · 2014: 40 · 2013: 15 · 2012: 11
FWCI
4.95
Type
journal article
Language
en
Open access
Locations
  • Journal of Molecular Biology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Cancer Institute (T32CA009035)
  • National Institute of General Medical Sciences (R01-GM84453, P20 GM76222, P20GM076222, R01GM084453)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Monoclonal and Polyclonal Antibodies Research
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
Keywords
hypervariable region, conformational clustering, circular statistics, affinity propagation, antibody structure prediction, antibody design
MeSH terms
Algorithms, Amino Acid Sequence, Animals, Antibodies, Humans, Immunoglobulin Variable Region, Immunoglobulin Heavy Chains, Markov Chains, Molecular Sequence Data, Protein Conformation, Complementarity Determining Regions, Mice

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