5NQA image
Entry Detail
PDB ID:
5NQA
Keywords:
Title:
Crystal structure of GalNAc-T4 in complex with the monoglycopeptide 3
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2017-04-19
Release Date:
2017-12-20
Method Details:
Experimental Method:
Resolution:
1.90 Å
R-Value Free:
0.27
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Polypeptide N-acetylgalactosaminyltransferase 4
Chain IDs:A, B
Chain Length:578
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Monoglycopeptide 3
Chain IDs:C (auth: G)
Chain Length:16
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
The interdomain flexible linker of the polypeptide GalNAc transferases dictates their long-range glycosylation preferences.
Nat Commun 8 1959 1959 (2017)
PMID: 29208955 DOI: 10.1038/s41467-017-02006-0

Abstact

The polypeptide GalNAc-transferases (GalNAc-Ts), that initiate mucin-type O-glycosylation, consist of a catalytic and a lectin domain connected by a flexible linker. In addition to recognizing polypeptide sequence, the GalNAc-Ts exhibit unique long-range N- and/or C-terminal prior glycosylation (GalNAc-O-Ser/Thr) preferences modulated by the lectin domain. Here we report studies on GalNAc-T4 that reveal the origins of its unique N-terminal long-range glycopeptide specificity, which is the opposite of GalNAc-T2. The GalNAc-T4 structure bound to a monoglycopeptide shows that the GalNAc-binding site of its lectin domain is rotated relative to the homologous GalNAc-T2 structure, explaining their different long-range preferences. Kinetics and molecular dynamics simulations on several GalNAc-T2 flexible linker constructs show altered remote prior glycosylation preferences, confirming that the flexible linker dictates the rotation of the lectin domain, thus modulating the GalNAc-Ts' long-range preferences. This work for the first time provides the structural basis for the different remote prior glycosylation preferences of the GalNAc-Ts.

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