National Natural Science Foundation of China (NSFC)
22077056
中国
National Natural Science Foundation of China (NSFC)
22377046
中国
National Natural Science Foundation of China (NSFC)
32171300
中国
National Natural Science Foundation of China (NSFC)
2210070084
中国
National Natural Science Foundation of China (NSFC)
21907046
中国
Other government
22ZD6FA006
Other government
23ZDFA015
引用
ジャーナル: Nat Chem Biol / 年: 2026 タイトル: Iterative acylation on mature lasso peptides by widespread acetyltransferases. 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 / 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.