Cited by 85Glycosylation and Glycoproteins ResearchEndoplasmic Reticulum Stress and DiseaseProtein Structure and Dynamics

C-mannosylation supports folding and enhances stability of thrombospondin repeats

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Shcherbakova, Aleksandra, Preller, Matthias, Taft, Manuel H, Pujols, Jordi, Ventura, Salvador, Tiemann, Birgit, Buettner, Falk FR, Bakker, Hans·2019·eLife

Abstract

Previous studies demonstrated importance of C-mannosylation for efficient protein secretion. To study its impact on protein folding and stability, we analyzed both C-mannosylated and non-C-mannosylated thrombospondin type 1 repeats (TSRs) of netrin receptor UNC-5. In absence of C-mannosylation, UNC-5 TSRs could only be obtained at low temperature and a significant proportion displayed incorrect intermolecular disulfide bridging, which was hardly observed when C-mannosylated. Glycosylated TSRs exhibited higher resistance to thermal and reductive denaturation processes, and the presence of C-mannoses promoted the oxidative folding of a reduced and denatured TSR in vitro. Molecular dynamics simulations supported the experimental studies and showed that C-mannoses can be involved in intramolecular hydrogen bonding and limit the flexibility of the TSR tryptophan-arginine ladder. We propose that in the endoplasmic reticulum folding process, C-mannoses orient the underlying tryptophan residues and facilitate the formation of the tryptophan-arginine ladder, thereby influencing the positioning of cysteines and disulfide bridging.

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Authors
Shcherbakova, A., Preller, M., Taft, M. H., Pujols, J., Ventura, S., Tiemann, B., Buettner, F. F., & Bakker, H.
Affiliations
  • Medizinische Hochschule Hannover (DE)
  • Universitat Autònoma de Barcelona (ES)
Corresponding author
Bakker, Hans
Venue
eLife
Published
2019-12-23
Volume
8
ISSN
2050-084X (ISSN-L)
OpenAlex
W2995628811
Cited by
85
References
44
Citations by year
2026: 7 · 2025: 8 · 2024: 7 · 2023: 12 · 2022: 16 · 2021: 19 · 2020: 13 · 2019: 1 · 2018: 1
FWCI
4.05
Type
journal article
Language
en
Open access
Locations
  • eLife (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Dipòsit Digital de Documents de la UAB (Universitat Autònoma de Barcelona) (submittedVersion, cc-by)
  • LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • OPUS (Augsburg University) (submittedVersion, cc-by)
  • Apollo (University of Cambridge) (submittedVersion, cc-by)
  • Apollo (cc-by)
Funders
Deutsche Forschungsgemeinschaft (FOR2509 BA 4091/6-1, BA 4091/5-1, BU 2920/2-1)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Glycosylation and Glycoproteins Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Endoplasmic Reticulum Stress and Disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
Keywords
C-mannosylation, thrombospondin type 1 repeats, protein folding, protein stability, oxidative protein folding, glycosylation, thermal denaturation, intramolecular hydrogen bonding
MeSH terms
Animals, Arginine, Cysteine, Disulfides, Drosophila melanogaster, Endoplasmic Reticulum, Glycosylation, Hydrogen Bonding, Mannose, Membrane Proteins, Protein Conformation, Receptors, Cell Surface, Tryptophan, Caenorhabditis elegans, Protein Folding, Thrombospondins, Caenorhabditis elegans Proteins, Molecular Dynamics Simulation

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