Cited by 105Protein Structure and DynamicsElectron Spin Resonance StudiesBone and Dental Protein Studies

Cooperative Unfolding of Compact Conformations of the Intrinsically Disordered Protein Osteopontin

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Kurzbach, Dennis, Platzer, Gerald, Schwarz, Thomas C., Henen, Morkos A., Konrat, Robert, Hinderberger, Dariush·2013·Biochemistry

Abstract

Intrinsically disordered proteins (IDPs) constitute a class of biologically active proteins that lack defined tertiary and often secondary structure. The IDP Osteopontin (OPN), a cytokine involved in metastasis of several types of cancer, is shown to simultaneously sample extended, random coil-like conformations and stable, cooperatively folded conformations. By a combination of two magnetic resonance methods, electron paramagnetic resonance and nuclear magnetic resonance spectroscopy, we demonstrate that the OPN ensemble exhibits not only characteristics of an extended and flexible polypeptide, as expected for an IDP, but also simultaneously those of globular proteins, in particular sigmoidal structural denaturation profiles. Both types of states, extended and cooperatively folded, are populated simultaneously by OPN in its apo state. The heterogeneity of the structural properties of IDPs is thus shown to even involve cooperative folding and unfolding events.

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  • Unliganded osteopontin interconverts between extended random coil-like conformations and a collapsed cooperatively folded state capable of generating sigmoidal structural denaturation curves.

    “Unliganded osteopontin interconverts between extended, random coil-like conformations as well as a collapsed, cooperatively folded state capable of generating sigmoidal structural denaturation curves [198].”
  • Interactions of other proteins with osteopontin generally occur via conformational selection.

    “These results suggest that interactions of other proteins with osteopontin generally occur via conformational selection [198].”

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1 of the 48 references couldn’t be matched to a known paper.

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  1. Tompa P.; Fuxreiter M. (2008) Fuzzy complexes: Polymorphism and structural disorder in protein-protein interactions. Trends Biochem. Sci. 33, 2– 8. 18054235

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Authors
Kurzbach, D., Platzer, G., Schwarz, T. C., Henen, M. A., Konrat, R., & Hinderberger, D.
Affiliations
  • Max Planck Society (DE)
  • Max Perutz Labs (AT)
  • Mansoura University (EG)
Corresponding author
  • Konrat, Robert
  • Hinderberger, Dariush
Venue
Biochemistry
Published
2013-07-24
Volume
52
Issue
31
Pages
5167-5175
ISSN
  • 0006-2960 (ISSN-L)
  • 1520-4995
OpenAlex
W1982145465
Cited by
105
References
48
Citations by year
2026: 4 · 2025: 8 · 2024: 9 · 2023: 11 · 2022: 7 · 2021: 8 · 2020: 10 · 2019: 6 · 2018: 8 · 2017: 7 · 2016: 10 · 2015: 9 · 2014: 7 · 2013: 1
FWCI
4.03
Type
journal article
Language
en
Open access
Locations
  • Biochemistry (publishedVersion, other-oa)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Electron Spin Resonance Studies
  • Health Sciences › Medicine › Rheumatology › Bone and Dental Protein Studies
Keywords
osteopontin, intrinsically disordered proteins, cooperative folding, cooperative unfolding, protein conformational ensembles, random coil, apo state, metastasis, electron spin resonance, nuclear magnetic resonance
MeSH terms
Animals, Kinetics, Protein Conformation, Quail, Protein Folding, Nuclear Magnetic Resonance, Biomolecular, Avian Proteins, Osteopontin, Protein Unfolding, Intrinsically Disordered Proteins

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