Aspartate Residues Far from the Active Site Drive O-GlcNAc Transferase Substrate Selection
O-GlcNAc is an abundant post-translational modification found on nuclear and cytoplasmic proteins in all metazoans. This modification regulates a wide variety of cellular processes, and elevated O-GlcNAc levels have been implicated in cancer progression. A single essential enzyme, O-GlcNAc transferase (OGT), is responsible for all nucleocytoplasmic O-GlcNAcylation. Understanding how this enzyme chooses its substrates is critical for understanding, and potentially manipulating, its functions. Here we use protein microarray technology and proteome-wide glycosylation profiling to show that conserved aspartate residues in the tetratricopeptide repeat (TPR) lumen of OGT drive substrate selection. Changing these residues to alanines alters substrate selectivity and unexpectedly increases rates of protein glycosylation. Our findings support a model where sites of glycosylation for many OGT substrates are determined by TPR domain contacts to substrate side chains five to fifteen residues C-terminal to the glycosite. In addition to guiding design of inhibitors that target OGT's TPR domain, this information will inform efforts to engineer substrates to explore biological functions.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2019 |
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| Erschienen: |
2019 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:141 |
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| Enthalten in: |
Journal of the American Chemical Society - 141(2019), 33 vom: 21. Aug., Seite 12974-12978 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Joiner, Cassandra M [VerfasserIn] |
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| Links: |
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| Themen: |
30KYC7MIAI |
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| Anmerkungen: |
Date Completed 11.09.2020 Date Revised 11.09.2020 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1021/jacs.9b06061 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM299848299 |
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| 100 | 1 | |a Joiner, Cassandra M |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Aspartate Residues Far from the Active Site Drive O-GlcNAc Transferase Substrate Selection |
| 264 | 1 | |c 2019 | |
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| 500 | |a Date Completed 11.09.2020 | ||
| 500 | |a Date Revised 11.09.2020 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a O-GlcNAc is an abundant post-translational modification found on nuclear and cytoplasmic proteins in all metazoans. This modification regulates a wide variety of cellular processes, and elevated O-GlcNAc levels have been implicated in cancer progression. A single essential enzyme, O-GlcNAc transferase (OGT), is responsible for all nucleocytoplasmic O-GlcNAcylation. Understanding how this enzyme chooses its substrates is critical for understanding, and potentially manipulating, its functions. Here we use protein microarray technology and proteome-wide glycosylation profiling to show that conserved aspartate residues in the tetratricopeptide repeat (TPR) lumen of OGT drive substrate selection. Changing these residues to alanines alters substrate selectivity and unexpectedly increases rates of protein glycosylation. Our findings support a model where sites of glycosylation for many OGT substrates are determined by TPR domain contacts to substrate side chains five to fifteen residues C-terminal to the glycosite. In addition to guiding design of inhibitors that target OGT's TPR domain, this information will inform efforts to engineer substrates to explore biological functions | ||
| 650 | 4 | |a Journal Article | |
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| 700 | 1 | |a Levine, Zebulon G |e verfasserin |4 aut | |
| 700 | 1 | |a Aonbangkhen, Chanat |e verfasserin |4 aut | |
| 700 | 1 | |a Woo, Christina M |e verfasserin |4 aut | |
| 700 | 1 | |a Walker, Suzanne |e verfasserin |4 aut | |
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