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-Structure paper
| タイトル | Iterative acylation on mature lasso peptides by widespread acetyltransferases. |
|---|---|
| ジャーナル・号・ページ | Nat Chem Biol, Year 2026 |
| 掲載日 | 2026年3月13日 |
著者 | Jiang Xiong / Shanquan Wu / Zi-Qi Liang / Shuo Fang / Fen-Yu Tao / Xiao-Tong Gong / Xing Wu / Qingfeng Wu / Jiao-Jiao Cui / Kun Gao / Kin Kuan Hoi / Yong Peng / Shangwen Luo / Dongsheng Lei / Shi-Hui Dong / ![]() |
| PubMed 要旨 | The biosynthesis of ribosomally synthesized and posttranslationally modified peptides (RiPPs) leverages iterative catalysis to enhance structural and biological diversity. Traditionally, iterative ...The biosynthesis of ribosomally synthesized and posttranslationally modified peptides (RiPPs) leverages iterative catalysis to enhance structural and biological diversity. Traditionally, iterative enzymes install posttranslational modifications on linear peptides, rather than mature RiPPs with intricate three-dimensional structures, which require complex changes in substrate binding. Here we present a prolific class of GCN5-related N-acetyltransferases (GNATs) that iteratively and consecutively acylate two Lys residues within the loop and ring motifs of lasso peptides, diverging from the typical iterative modification of linear peptides. Utilizing high-resolution cryogenic-electron microscopy and enzymatic reconstitution, we define the lasso peptide-binding pocket of IatT and pinpoint key residues that distinguish its two distinct acetylation steps. Structure-based engineering of IatT's acetyl-recognition site expands the cavity to accommodate longer-chain acyl groups, enabling the creation of lipolasso peptides, a class of ribosomal lipopeptide. This engineering strategy can be applied to any RiPP biosynthetic gene cluster encoding GNAT, facilitating the efficient diversification of ribosomal lipopeptides. |
リンク | Nat Chem Biol / PubMed:41826761 |
| 手法 | EM (単粒子) |
| 解像度 | 2.0 - 3.43 Å |
| 構造データ | EMDB-60983, PDB-9iy3: EMDB-60984, PDB-9iy4: EMDB-64004, PDB-9ubc: |
| 化合物 | ![]() ChemComp-COA: ![]() ChemComp-ACO: |
| 由来 |
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キーワード | TRANSFERASE / GCN5-related N-acetyltransferases / Actinomycetes / CoA / AcCoA / Lasso peptides |
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actinosynnema mirum dsm 43827 (バクテリア)
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