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-Structure paper
| タイトル | Multi-domain O-GlcNAcase structures reveal allosteric regulatory mechanisms. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 8828, Year 2025 |
| 掲載日 | 2025年10月3日 |
著者 | Sara Basse Hansen / Sergio G Bartual / Huijie Yuan / Olawale G Raimi / Andrii Gorelik / Andrew T Ferenbach / Kristian Lytje / Jan Skov Pedersen / Taner Drace / Thomas Boesen / Daan M F van Aalten / ![]() |
| PubMed 要旨 | Nucleocytoplasmic protein O-GlcNAcylation is a dynamic modification catalysed by O-GlcNAc transferase (OGT) and reversed by O-GlcNAc hydrolase (OGA), whose activities are regulated through largely ...Nucleocytoplasmic protein O-GlcNAcylation is a dynamic modification catalysed by O-GlcNAc transferase (OGT) and reversed by O-GlcNAc hydrolase (OGA), whose activities are regulated through largely unknown O-GlcNAc-dependent feedback mechanisms. OGA is a homodimeric, multi-domain enzyme containing a catalytic core and a pseudo-histone acetyltransferase (pHAT) domain. While a catalytic structure has been reported, the structure and function of the pHAT domain remain elusive. Here, we report a crystal structure of the Trichoplax adhaerens pHAT domain and cryo-EM data of the multi-domain T. adhaerens and human OGAs, complemented by biophysical analyses. Here, we show that the eukaryotic OGA pHAT domain forms catalytically incompetent, symmetric homodimers, projecting a partially conserved putative peptide-binding site. In solution, OGA exist as flexible multi-domain dimers, but catalytic core-pHAT linker interactions restrict pHAT positional range. In human OGA, pHAT movements remodel the active site environment through conformational changes in a flexible arm region. These findings reveal allosteric mechanisms through which the pHAT domain contributes to O-GlcNAc homeostasis. |
リンク | Nat Commun / PubMed:41044083 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.99 - 3.08 Å |
| 構造データ | EMDB-53081, PDB-9qen: EMDB-53082, PDB-9qep: |
| 由来 |
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キーワード | HYDROLASE / GH84 hydrolase |
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homo sapiens (ヒト)
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