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-Structure paper
| タイトル | Site-Specific Histidine Aza-Michael Addition in Proteins Enabled by a Ferritin-Based Metalloenzyme. |
|---|---|
| ジャーナル・号・ページ | J Am Chem Soc, Vol. 146, Issue 49, Page 33309-33315, Year 2024 |
| 掲載日 | 2024年12月11日 |
著者 | Jo-Chu Tsou / Chun-Ju Tsou / Chun-Hsiung Wang / An-Li A Ko / Yi-Hui Wang / Huan-Hsuan Liang / Jia-Cheng Sun / Kai-Fa Huang / Tzu-Ping Ko / Shu-Yu Lin / Yane-Shih Wang / ![]() |
| PubMed 要旨 | Histidine modifications of proteins are broadly based on chemical methods triggering N-substitution reactions such as aza-Michael addition at histidine's moderately nucleophilic imidazole side chain. ...Histidine modifications of proteins are broadly based on chemical methods triggering N-substitution reactions such as aza-Michael addition at histidine's moderately nucleophilic imidazole side chain. While recent studies have demonstrated chemoselective, histidine-specific modifications by further exploiting imidazole's electrophilic reactivity to overcome interference from the more nucleophilic lysine and cysteine, achieving site-specific histidine modifications remains a major challenge due to the absence of spatial control over chemical processes. Herein, through X-ray crystallography and cryo-electron microscopy structural studies, we describe the rational design of a nature-inspired, noncanonical amino-acid-incorporated, human ferritin-based metalloenzyme that is capable of introducing site-specific post-translational modifications (PTMs) to histidine in peptides and proteins. Specifically, chemoenzymatic aza-Michael additions on single histidine residues were carried out on eight protein substrates ranging from 10 to 607 amino acids including the insulin peptide hormone. By introducing an insulin-targeting peptide into our metalloenzyme, we further directed modifications to be carried out site-specifically on insulin's B-chain histidine 5. The success of this biocatalysis platform outlines a novel approach in introducing residue- and, moreover, site-specific post-translational modifications to peptides and proteins, which may further enable reactions to be carried out . |
リンク | J Am Chem Soc / PubMed:39499210 / PubMed Central |
| 手法 | EM (単粒子) / X線回折 |
| 解像度 | 1.73 - 2.28 Å |
| 構造データ | EMDB-61726, PDB-9jqb: EMDB-61727, PDB-9jqc: EMDB-61728, PDB-9jqd: EMDB-61729, PDB-9jqe: ![]() PDB-9jiu: |
| 化合物 | ![]() ChemComp-NA: ![]() ChemComp-P6G: ![]() ChemComp-HOH: ![]() ChemComp-CU: ![]() ChemComp-FE: |
| 由来 |
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キーワード | METAL BINDING PROTEIN / 3-methyl-histidine / apo-form / human heavy chain ferritin / Cryo-EM / ferritin variant / non-canonical amino acid / L-2-(5-Bromothienyl)alanine (BrThA) / metalloenzyme / copper / H-N-3-Methyl-L-histidine(MeH) |
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