Cellular and Molecular Life Sciences

, Volume 75, Issue 5, pp 833–848 | Cite as

Crystal structures of eukaryote glycosyltransferases reveal biologically relevant enzyme homooligomers

Review

Abstract

Glycosyltransferases (GTases) transfer sugar moieties to proteins, lipids or existing glycan or polysaccharide molecules. GTases form an important group of enzymes in the Golgi, where the synthesis and modification of glycoproteins and glycolipids take place. Golgi GTases are almost invariably type II integral membrane proteins, with the C-terminal globular catalytic domain residing in the Golgi lumen. The enzymes themselves are divided into 103 families based on their sequence homology. There is an abundance of published crystal structures of GTase catalytic domains deposited in the Protein Data Bank (PDB). All of these represent either of the two main characteristic structural folds, GT-A or GT-B, or present a variation thereof. Since GTases can function as homomeric or heteromeric complexes in vivo, we have summarized the structural features of the dimerization interfaces in crystal structures of GTases, as well as considered the biochemical data available for these enzymes. For this review, we have considered all 898 GTase crystal structures in the Protein Data Bank and highlight the dimer formation characteristics of various GTases based on 24 selected structures.

Keywords

Protein Structure Dimerization Biologically relevant dimer Crystallographic dimer Protein–protein interfaces GTase fold 

Notes

Acknowledgements

The financial support from the Academy of Finland (no. 285232, date 11.05.2015), University of Oulu, and Emil Aaltonen Foundation is gratefully acknowledged. We also want to acknowledge Thibaud Colas for his help with automatized scripts used for the study of the interfaces.

Supplementary material

18_2017_2659_MOESM1_ESM.pptx (145 kb)
Supplement Fig. 1. Log-ratio of the frequency of amino acids observed at the interface and within the full-length sequence of the crystallized domains of the 24 GTase homodimers of this study. Stars indicate the statistical significance according to critical values of χ2 (PPTX 145 kb)
18_2017_2659_MOESM2_ESM.pptx (2.4 mb)
Supplement Fig. 2. Multiple sequence alignments of the dimerization interface for each of the 24 GTases. As the residue numbers are not sequential, they are detailed below each alignment (PPTX 2466 kb)

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© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.Faculty of Biochemistry and Molecular MedicineUniversity of OuluOuluFinland

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