6PLH image
Deposition Date 2019-06-30
Release Date 2020-07-08
Last Version Date 2024-11-20
Entry Detail
PDB ID:
6PLH
Keywords:
Title:
FAB fragment complexed with C-mannosylated tryptophan peptide
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Mus musculus (Taxon ID: 10090)
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.60 Å
R-Value Free:
0.22
R-Value Work:
0.18
R-Value Observed:
0.19
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Fab 5G12 light chain
Chain IDs:A
Chain Length:219
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Molecule:Fab 5G12 heavy chain
Chain IDs:B
Chain Length:223
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Molecule:Interleukin-21 receptor
Gene (Uniprot):IL21R
Chain IDs:C
Chain Length:37
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
Yeast- and antibody-based tools for studying tryptophan C-mannosylation.
Nat.Chem.Biol. 17 428 437 (2021)
PMID: 33542533 DOI: 10.1038/s41589-020-00727-w

Abstact

Tryptophan C-mannosylation is an unusual co-translational protein modification performed by metazoans and apicomplexan protists. The prevalence and biological functions of this modification are poorly understood, with progress in the field hampered by a dearth of convenient tools for installing and detecting the modification. Here, we engineer a yeast system to produce a diverse array of proteins with and without tryptophan C-mannosylation and interrogate the modification's influence on protein stability and function. This system also enabled mutagenesis studies to identify residues of the glycosyltransferase and its protein substrates that are crucial for catalysis. The collection of modified proteins accrued during this work facilitated the generation and thorough characterization of monoclonal antibodies against tryptophan C-mannosylation. These antibodies empowered proteomic analyses of the brain C-glycome by enriching for peptides possessing tryptophan C-mannosylation. This study revealed many new modification sites on proteins throughout the secretory pathway with both conventional and non-canonical consensus sequences.

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