"Structure of the polyisoprenyl-phosphate glycosyltransferase GtrB and " by Chiara Ardiccioni, Oliver B. Clarke et al.
 

Document Type

Journal Article

Publication Date

1-2016

Journal

Nature Communications

Volume

7

Inclusive Pages

10175

DOI

10.1038/ncomms10175

Keywords

Gene Expression Regulation, Bacterial--physiology; Gene Expression Regulation, Enzymologic--physiology; Glycosyltransferases--metabolism; Synechocystis--enzymology

Abstract

The attachment of a sugar to a hydrophobic polyisoprenyl carrier is the first step for all extracellular glycosylation processes. The enzymes that perform these reactions, polyisoprenyl-glycosyltransferases (PI-GTs) include dolichol phosphate mannose synthase (DPMS), which generates the mannose donor for glycosylation in the endoplasmic reticulum. Here we report the 3.0Å resolution crystal structure of GtrB, a glucose-specific PI-GT from Synechocystis, showing a tetramer in which each protomer contributes two helices to a membrane-spanning bundle. The active site is 15 Å from the membrane, raising the question of how water-soluble and membrane-embedded substrates are brought into apposition for catalysis. A conserved juxtamembrane domain harbours disease mutations, which compromised activity in GtrB in vitro and in humanDPM1 tested in zebrafish. We hypothesize a role of this domain in shielding the polyisoprenyl-phosphate for transport to the active site. Our results reveal the basis of PI-GT function, and provide a potential molecular explanation for DPM1-related disease.

Comments

Reproduced with permission of Macmillan Publishers Ltd. Nature Communications.

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.

Peer Reviewed

1

Open Access

1

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