Cited by 106Protein Structure and DynamicsEnzyme Structure and FunctionBiochemical and Structural Characterization

Extended knobs-into-holes packing in classical and complex coiled-coil assemblies☆

Walshaw, John, Woolfson, Derek N.·2003·Journal of Structural Biology

Abstract

This year marks the 50th anniversary of Crick's seminal paper on the packing of alpha-helices into coiled-coil structures. The central tenet of Crick's work is the interdigitation of side chains, which directs the helix-helix interactions; so called knobs-into-holes packing. Subsequent determinations of coiled-coil-protein sequences and structures confirmed the key features of Crick's model and established it as a fundamental concept in structural biology. Recently, we developed a program, SOCKET, to recognise knobs-into-holes packing in protein structures, which we applied to the Protein Data Bank to compile a database of coiled-coil structures. In addition to classic structures, the database reveals 4-helix bundles and larger helical assemblies. Here, we describe how the more-complex structures can be understood by extending Crick's principles for classic coiled coils. In the simplest case, each helix of a 2-stranded structure contributes a single seam of (core) knobs-into-holes to the helical interface. 3-, 4-, and 5-Stranded structures, however, are best considered as rings of helices with cycles of knobs-into-holes. These higher-order oligomers make additional (peripheral) knobs-into-holes that broaden the helical contacts. Combinations of core and peripheral knobs may be assigned to different sequence repeats offset within the same helix. Such multiple repeats lead to multi-faceted helices, which explain structures above dimers. For instance, coiled-coil oligomer state correlates with the offset of the different repeats along a sequence. In addition, certain multi-helix assemblies can be considered as conjoined coiled coils in which multi-faceted helices participate in more than one coiled-coil motif.

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Crossref · 10.1016/j.jsb.2003.10.014

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Authors
Walshaw, J., & Woolfson, D. N.
Affiliations
University of Sussex (GB)
Corresponding author
Woolfson, Derek N.
Venue
Journal of Structural Biology
Publisher
Elsevier BV
Published
2003-12
Volume
144
Issue
3
Pages
349-361
ISSN
1047-8477 (ISSN-L)
OpenAlex
W2110361885
Cited by
104
References
43
Citations by year
2026: 5 · 2025: 6 · 2024: 4 · 2023: 6 · 2022: 3 · 2021: 3 · 2020: 4 · 2019: 3 · 2018: 4 · 2017: 7 · 2016: 3 · 2015: 3 · 2014: 3 · 2013: 5 · 2012: 6
FWCI
1.72
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Structural Biology (publishedVersion)
  • PubMed (publishedVersion)
  • Bristol Research (University of Bristol) (submittedVersion)
Funders
Medical Research Council
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biochemical and Structural Characterization
Keywords
coiled coil, alpha-helix packing, helical oligomers, helix-helix interactions, sequence repeats
MeSH terms
Algorithms, Models, Molecular, Nucleic Acid Conformation, Protein Binding, Protein Conformation, Software, Protein Structure, Secondary, Amino Acid Motifs

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