Cited by 125Protein Structure and DynamicsMonoclonal and Polyclonal Antibodies ResearchEnzyme Structure and Function

ABangle: characterising the VH-VL orientation in antibodies

Dunbar, J., Fuchs, A., Shi, J., Deane, C. M.·2013·Protein Engineering Design and Selection

Abstract

The binding site of an antibody is formed between the two variable domains, VH and VL, of its antigen binding fragment (Fab). Understanding how VH and VL orientate with respect to one another is important both for studying the mechanisms of antigen specificity and affinity and improving antibody modelling, docking and engineering. Different VH-VL orientations are commonly described using relative measures such as root-mean-square deviation. Recently, the orientation has also been characterised using the absolute measure of a VH-VL packing angle. However, a single angle cannot fully describe all modes of orientation. Here, we present a method which fully characterises VH-VL orientation in a consistent and absolute sense using five angles (HL, HC1, LC1, HC2 and LC2) and a distance (dc). Additionally, we provide a computational tool, ABangle, to allow the VH-VL orientation for any antibody to be automatically calculated and compared with all other known structures. We compare previous studies and show how the modes of orientation being identified relate to movements of different angles. Thus, we are able to explain why different studies identify different structural clusters and different residues as important. Given this result, we then identify those positions and their residue identities which influence each of the angular measures of orientation. Finally, by analysing VH-VL orientation in bound and unbound forms, we find that antibodies specific for protein antigens are significantly more flexible in their unbound form than antibodies specific for hapten antigens. ABangle is freely available at http://opig.stats.ox.ac.uk/webapps/abangle.

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Crossref · 10.1093/protein/gzt020

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Authors
Dunbar, J., Fuchs, A., Shi, J., & Deane, C. M.
Affiliations
  • University of Oxford (GB)
  • UCB Pharma (United Kingdom) (GB)
Venue
Protein Engineering Design and Selection
Published
2013-05-24
Volume
26
Issue
10
Pages
611-620
ISSN
  • 0269-2139 (ISSN-L)
  • 1741-0126
  • 1741-0134
OpenAlex
W2154135618
Cited by
125
References
40
Citations by year
2026: 5 · 2025: 11 · 2024: 6 · 2023: 22 · 2022: 11 · 2021: 12 · 2020: 8 · 2019: 11 · 2018: 7 · 2017: 9 · 2016: 7 · 2015: 7 · 2014: 7 · 2013: 2
FWCI
3.43
Type
journal article
Language
en
Open access
closed
Locations
  • Protein Engineering Design and Selection (publishedVersion)
  • PubMed (publishedVersion)
Funders
Engineering and Physical Sciences Research Council
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
antibody structure, Fab fragment, antibody binding sites, structural clusters, antibody flexibility, antibody engineering
MeSH terms
Animals, Antibodies, Haptens, Humans, Immunoglobulin Variable Region, Immunoglobulin Light Chains, Models, Molecular, Protein Conformation, Consensus Sequence, Computational Biology, Mice, Rats

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