Cited by 266Protein Structure and DynamicsChemical Synthesis and AnalysisBiochemical and Structural Characterization

A Buried Polar Interaction Imparts Structural Uniqueness in a Designed Heterodimeric Coiled Coil

Lumb, Kevin J., Kim, Peter S.·1995·Biochemistry

Abstract

Buried polar residues are a common feature of natural proteins. ACID-p1 and BASE-p1 are two designed peptides that form a parallel, heterodimeric coiled coil with a fixed tertiary structure [O'Shea, E. K., Lumb, K. J., & Kim, P. S. (1993) Curr. Biol. 3, 658-667]. The interface between the ACID-p1 and BASE-p1 helices consists of hydrophobic Leu residues, with the exception of a single polar residue, Asn 14. In the crystal structure of the GCN4 leucine zipper coiled coil, an analogous Asn is hydrogen bonded to the corresponding Asn of the opposing helix, thereby forming a buried polar interaction in an otherwise hydrophobic interface between the helices [O'Shea, E. K., Klemm, J. D., Kim, P. S., & Alber, T. (1991) Science 254, 539-544]. This buried polar interaction in the ACID-p1/BASE-p1 heterodimer was removed by substituting Asn 14 with Leu. The Asn 14-->Leu variants are significantly more stable than the p1 peptides and preferentially form a heterotetramer instead of a heterodimer. Strikingly, the heterotetramer does not fold into a unique structure; in particular, the helices lack a unique orientation. Thus, the Asn 14 residue imparts specificity for formation of a two-stranded, parallel coiled coil at the expense of stability. The results suggest that, whereas nonspecific hydrophobic interactions contribute to protein stability, the requirement to satisfy the hydrogen bonding potential of buried polar residues in the generally hydrophobic environment of the protein interior can impart specificity (structural uniqueness) to protein folding and design.

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Crossref · 10.1021/bi00027a013

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  • NEDD8's Gln40 contacts CUL1, the isopeptide bond, and NEDD8's C-terminal tail in a buried polar interaction typical of those organizing apolar interfaces.

    “At the center, NEDD8’s Gln40 contacts CUL1, the isopeptide bond, and NEDD8’s C-terminal tail in a buried polar interaction typical of those organizing apolar interfaces33.”

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Authors
Lumb, K. J., & Kim, P. S.
Affiliations
Howard Hughes Medical Institute (US)
Venue
Biochemistry
Published
1995-07-11
Volume
34
Issue
27
Pages
8642-8648
ISSN
  • 0006-2960 (ISSN-L)
  • 1520-4995
OpenAlex
W2019189228
Cited by
266
References
53
Citations by year
2026: 2 · 2025: 1 · 2024: 2 · 2023: 6 · 2022: 3 · 2021: 4 · 2020: 4 · 2019: 2 · 2018: 8 · 2017: 4 · 2016: 6 · 2015: 4 · 2014: 5 · 2013: 3 · 2012: 12
FWCI
6.81
Type
journal article
Language
en
Open access
closed
Locations
  • Biochemistry (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (2r01gm044162-10)
  • National Institute of General Medical Sciences (GM44162)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Chemical Synthesis and Analysis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biochemical and Structural Characterization
Keywords
peptide design, hydrophobic interface, hydrogen bonding, GCN4 leucine zipper, heterotetramer, helix orientation, protein stability
MeSH terms
Amino Acid Sequence, Anilino Naphthalenesulfonates, Asparagine, Circular Dichroism, Fluorescent Dyes, Hydrogen, Hydrogen Bonding, Hydrogen-Ion Concentration, Molecular Sequence Data, Protein Conformation, Proteins, Thermodynamics, Protein Structure, Secondary, Protein Folding

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