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A mutant O-GlcNAcase enriches Drosophila developmental regulators

Abstract

Protein O-GlcNAcylation is a reversible post-translational modification of serines and threonines on nucleocytoplasmic proteins. It is cycled by the enzymes O-GlcNAc transferase (OGT) and O-GlcNAc hydrolase (O-GlcNAcase or OGA). Genetic approaches in model organisms have revealed that protein O-GlcNAcylation is essential for early embryogenesis. The Drosophila melanogaster gene supersex combs (sxc), which encodes OGT, is a polycomb gene, whose null mutants display homeotic transformations and die at the pharate adult stage. However, the identities of the O-GlcNAcylated proteins involved and the underlying mechanisms linking these phenotypes to embryonic development are poorly understood. Identification of O-GlcNAcylated proteins from biological samples is hampered by the low stoichiometry of this modification and by limited enrichment tools. Using a catalytically inactive bacterial O-GlcNAcase mutant as a substrate trap, we have enriched the O-GlcNAc proteome of the developing Drosophila embryo, identifying, among others, known regulators of Hox genes as candidate conveyors of OGT function during embryonic development.

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Figure 1: A point mutant of CpOGA can be exploited as a substrate trap for the enrichment of O-GlcNAcylated proteins.
Figure 2: Pull down of O-GlcNAcylated proteins by CpOGAD298N.
Figure 3: Protein class grouping of proteins identified by CpOGAD298N and example ETD fragmentation spectra for HexNAc modified peptides from host cell factor and nucleoporin 153.
Figure 4: OGT catalytic activity potentiates the function of its substrates Grunge and myopic.

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Acknowledgements

This work is funded by a Wellcome Trust Senior Investigator Award (110061) to D.M.F.v.A. M.T. is funded by a MRC grant (MC_UU_12016/5). R.W. is funded by a Royal Society Research Grant. We thank J. Peltier for help with mass spectrometry and O. Raimi for help with protein purification.

Author information

Authors and Affiliations

Authors

Contributions

N.S., R.W. and D.M.F.v.A. conceived the study; N.S., R.W., and D.M. performed experiments; D.G.C., R.G. and M.T. performed mass spectrometry; A.T.F. performed molecular biology; T.A. and I.H.-N. performed SPR; N.S., D.G.C., and M.T. analyzed MS data; D.M. analyzed genetics data; and N.S., R.W., D.M., and D.M.F.v.A. interpreted the data and wrote the manuscript with input from all authors.

Corresponding author

Correspondence to Daan M F van Aalten.

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The authors declare no competing financial interests.

Supplementary information

Supplementary Text and Figures

Supplementary Results, Supplementary Tables 1–8 and Supplementary Figures 1–9 (PDF 1132 kb)

Supplementary Dataset 1

All proteins (from HeLa cells) identified in this study. (XLSX 134 kb)

Supplementary Dataset 2

HexNAc peptides identified (from HeLa cells) in this study. (XLSX 127 kb)

Supplementary Dataset 3

All proteins (from Drosophila embryos) identified in this study. (XLSX 501 kb)

Supplementary Dataset 4

HexNAc peptides identified (from Drosophila embryos) in this study. (XLSX 48 kb)

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Selvan, N., Williamson, R., Mariappa, D. et al. A mutant O-GlcNAcase enriches Drosophila developmental regulators. Nat Chem Biol 13, 882–887 (2017). https://doi.org/10.1038/nchembio.2404

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