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C-Mannosylation Enhances the Structural Stability of Human RNase 2
- Source :
- iScience, Vol 23, Iss 8, Pp 101371- (2020)
- Publication Year :
- 2020
- Publisher :
- Elsevier, 2020.
-
Abstract
- Summary: C-Mannosylation is a relatively rare form of protein glycosylation involving the attachment of an α-mannopyranosyl residue to C-2 of the indole moiety of the amino acid tryptophan. This type of linkage was initially discovered in RNase 2 from human urine but later confirmed to be present in many other important proteins. Based on NMR experiments and extensive molecular dynamics simulations on the hundred microsecond timescale we demonstrate that, for isolated glycopeptides and denatured RNase 2, the C-linked mannopyranosyl residue exists as an ensemble of conformations, among which 1C4 is the most abundant. However, for native RNase 2, molecular dynamics and NMR studies revealed that the mannopyranosyl residue favors a specific conformation, which optimally stabilizes the protein fold through a network of hydrogen bonds and which leads to a significant reduction of the protein dynamics on the microsecond timescale. Our findings contribute to the understanding of the biological role of C-mannosylation.
- Subjects :
- Biochemistry
Structural Biology
Protein Structure Aspects
Science
Subjects
Details
- Language :
- English
- ISSN :
- 25890042
- Volume :
- 23
- Issue :
- 8
- Database :
- Directory of Open Access Journals
- Journal :
- iScience
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.9b622e471fd43a3aa43401b1f844ead
- Document Type :
- article
- Full Text :
- https://doi.org/10.1016/j.isci.2020.101371