Structures of the holoenzyme TglHI required for 3-thiaglutamate biosynthesis

Yanhui Zheng, Xiaoqing Xu, Xiaoli Fu, Xuerong Zhou, Chao Dou, Yue Yu, Weizhu Yan, Jingyuan Yang, Minqin Xiao, Wilfred A. van der Donk, Xiaofeng Zhu, Wei Cheng

Research output: Contribution to journalArticlepeer-review

Abstract

Structural diverse natural products like ribosomally synthesized and posttranslationally modified peptides (RiPPs) display a wide range of biological activities. Currently, the mechanism of an uncommon reaction step during the biosynthesis of 3-thiaglutamate (3-thiaGlu) is poorly understood. The removal of the β-carbon from the Cys in the TglA-Cys peptide catalyzed by the TglHI holoenzyme remains elusive. Here, we present three crystal structures of TglHI complexes with and without bound iron, which reveal that the catalytic pocket is formed by the interaction of TglH–TglI and that its activation is conformation dependent. Biochemical assays suggest a minimum of two iron ions in the active cluster, and we identify the position of a third iron site. Collectively, our study offers insights into the activation and catalysis mechanisms of the non-heme dioxygen-dependent holoenzyme TglHI. Additionally, it highlights the evolutionary and structural conservation in the DUF692 family of biosynthetic enzymes that produce diverse RiPPs.

Original languageEnglish (US)
Pages (from-to)1220-1232.e5
JournalStructure
Volume31
Issue number10
DOIs
StatePublished - Oct 5 2023

Keywords

  • RiPP
  • TglHI holoenzyme
  • X-ray
  • mechanism
  • metalloenzymes

ASJC Scopus subject areas

  • Molecular Biology
  • Structural Biology

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