+検索条件
-Structure paper
| タイトル | Structures of two LarA-like nickel-pincer nucleotide cofactor-utilizing enzymes with a single catalytic histidine residue. |
|---|---|
| ジャーナル・号・ページ | bioRxiv, Year 2025 |
| 掲載日 | 2025年8月21日 |
著者 | Santhosh Gatreddi / Sundharraman Subramanian / Dexin Sui / Tianqi Wang / Julian Urdiain-Arraiza / Benoit Desguin / Robert P Hausinger / Kristin N Parent / Jian Hu / ![]() |
| PubMed 要旨 | The nickel pincer nucleotide (NPN) cofactor catalyzes the racemization/epimerization of α-hydroxy acids in enzymes of the LarA family. The established proton-coupled hydride transfer mechanism ...The nickel pincer nucleotide (NPN) cofactor catalyzes the racemization/epimerization of α-hydroxy acids in enzymes of the LarA family. The established proton-coupled hydride transfer mechanism requires two catalytic histidine residues that alternately act as general acids and general bases. Notably, however, a fraction of LarA homologs (LarAHs) lack one of the active site histidine residues, replacing it with an asparaginyl side chain that cannot participate in acid/base catalysis. Here, we investigated two such LarAHs and solved their cryo-electron microscopic structures with and without loaded NPN cofactor, respectively. The structures revealed a consistent octameric assembly that is unprecedented in the LarA family and unveiled a new set of active site residues that likely recognize and process substrates differently from those of the well-studied LarAHs. Genomic context analysis suggested their potential involvement in carbohydrate metabolism. Together, these findings lay the groundwork for expanding the breadth of reactions and the range of mechanisms of LarA enzymes. |
リンク | bioRxiv / PubMed:40894700 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.2 - 3.15 Å |
| 構造データ | EMDB-72199, PDB-9q3j: EMDB-72200, PDB-9q3k: |
| 化合物 | ![]() ChemComp-NI: ![]() ChemComp-4EY: |
| 由来 |
|
キーワード | ISOMERASE / Racemase and epimerase activity / acting on hydroxy acids and derivatives / metal ion binding / catalytic activity |
ムービー
コントローラー
構造ビューア
万見文献について



著者

リンク





blautia wexlerae (バクテリア)
キーワード