9WQX

aminoacyl-tRNA-dependent peptide synthase, Sbb17, complexed with streptothrisamine

これはPDB形式変換不可エントリーです。

9WQX の概要

• エントリーDOI: 10.2210/pdb9wqx/pdb
• 分子名称: aminoacyl-tRNA-dependent peptide synthase, streptothrisamine (3 entities in total)
• 機能のキーワード: aminoacyl-trna-dependent peptide synthase, sbb17, transferase
• 由来する生物種: Streptomyces prunicolor
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 34339.43

構造登録者

Nakashima, Y.,Sherif, H.A.M.A.,Maruyama, C.,Morita, H.,Hamano, Y. (登録日: 2025-09-11, 公開日: 2026-04-01, 最終更新日: 2026-04-08)

主引用文献

Maruyama, C.,Nakashima, Y.,Matsuda, K.,A Hamdy, S.,Uchiyama, S.,Goto, Y.,Mori, T.,Ogasawara, Y.,Shin-Ya, K.,Abe, I.,Dairi, T.,Suga, H.,Morita, H.,Hamano, Y.
tRNA-Dependent Chemoenzymatic Transformation of Aminoacyl Pendant Moieties of Streptothricin Antibiotics.
J.Am.Chem.Soc., 148:12154-12165, 2026

PubMed Abstract: Streptothricin (ST) antibiotics are promising agents against multidrug-resistant pathogens and are structurally classified into two groups, containing either a β-lysyl or a glycyl pendant moiety attached via an amide bond to an amino sugar core. These pendant moieties are essential determinants of the biological activity and selective toxicity of ST antibiotics. We previously demonstrated that during ST biosynthesis, the β-lysyl pendant moiety is installed by nonribosomal peptide synthetases, whereas the glycyl pendant moiety is generated by a Gly-tRNA-dependent amide-forming enzyme. Here, we present a chemoenzymatic approach to transform aminoacyl pendant moieties using the promiscuous tRNA-dependent amide-forming enzyme Sba18. Remarkably, Sba18 generates two new ST derivatives, alanylthricin and serylthricin, by utilizing Ala-tRNA and Ser-tRNA, respectively. Moreover, Sba18 accepts aminoacyl-tRNA mimics prepared by flexizyme-mediated charging of chemically synthesized aminoacyl groups and produces additional 11 ST derivatives. Alanylthricin and serylthricin retain antibiotic activity, demonstrating that this tRNA-dependent chemoenzymatic approach provides a viable strategy for expanding the structural diversity of streptothricin antibiotics. Furthermore, structural comparison of Sba18 with its Gly-tRNA-specific orthologue Sbb17 elucidates the catalytic and substrate-recognition mechanisms underlying the broad specificity of Sba18. These structural insights provide a foundation for expanding the structural diversity not only of ST antibiotics but also of other peptide natural products biosynthesized using aminoacyl-tRNAs.

PubMed: 41823201
DOI: 10.1021/jacs.6c00367

実験手法

X-RAY DIFFRACTION (2.5 Å)