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-Structure paper
| タイトル | Human O-GlcNAcase catalytic-stalk dimer anchors flexible histone binding domains. |
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| ジャーナル・号・ページ | Commun Chem, Vol. 9, Issue 1, Page 8, Year 2025 |
| 掲載日 | 2025年12月9日 |
著者 | Sarah B Nyenhuis / Agata Steenackers / Mana Mohan Mukherjee / Jenny E Hinshaw / John A Hanover / ![]() |
| PubMed 要旨 | Although thousands of proteins are specifically O-GlcNAc modified, the molecular features recognized by the enzymes of O-GlcNAc cycling (OGT/OGA) remain poorly defined. Here we solved the structure ...Although thousands of proteins are specifically O-GlcNAc modified, the molecular features recognized by the enzymes of O-GlcNAc cycling (OGT/OGA) remain poorly defined. Here we solved the structure of the long isoform of human OGA (OGA-L) by cryo-electron microscopy (cryo-EM) providing a physiologically relevant platform to study the enzyme. The catalytic-stalk dimer structure was solved to a resolution of 3.63 Å, and the locally refined OGA A- and B-chains to 2.98 Å and 3.05 Å respectively. Intriguingly, the cryo-EM structures also exhibit lower resolution densities associated with the pHAT domains, suggesting substantial flexion of these domains relative to the catalytic-stalk dimer. OGA-L binds to a small subset of the 384 modified histone tails on a commercial histone peptide array. High affinity binding of OGA-L was detected to recombinant DNA-containing mononucleosomes bearing the H3K36 and H4K modifications. The OGA-L-H3K36 interaction was further validated by traditional ChIP experiments in MEFs. Thus, OGA-L binds to two modified histone tails of nucleosomes linked to open chromatin, whereas it does not bind to marks associated with repressive chromatin. This model is consistent with OGA-L acting as a 'reader' of histone modifications linked to development, transcriptional activation, transposon silencing, and DNA damage repair. |
リンク | Commun Chem / PubMed:41366547 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.98 - 10.07 Å |
| 構造データ | EMDB-49293, PDB-9ne2: EMDB-49294, PDB-9ne4: EMDB-49295, PDB-9ne5: ![]() EMDB-49296: cryoEM structure of the human OGA-L Dimer ![]() EMDB-49297: cryoEM structure of the human OGA-L Catalytic Dimer, extra A-chain density |
| 由来 |
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キーワード | HYDROLASE / O-GlcNAC / Histones / DNA repair / DNA Damage / Transcription / Epigenetics |
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