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Updated: Jul 4, 2026

Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay
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Published on: February 9, 2021

Rethinking Suicide Thi4 Thiazole Synthases: Comparative Genomic Insights and Pilot Functional Evidence.

Edmar R Oliveira-Filho1, Kristen Van Gelder1, David Obe2

  • 1Horticultural Sciences Department, University of Florida, Gainesville, Florida 32611, United States.

ACS Omega
|July 3, 2026
PubMed
Summary

Suicide thiazole synthases (Thi4) may function in a non-suicide mode by interacting with sulfur-relay systems. This study suggests bacterial Thi4 enzymes may depend on host sulfur transfer components for activity.

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Last Updated: Jul 4, 2026

Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay
05:17

Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay

Published on: February 9, 2021

Area of Science:

  • Biochemistry
  • Enzymology
  • Genomics

Background:

  • Suicide thiazole synthases (Thi4) are mononuclear metal enzymes crucial for thiamin biosynthesis.
  • These enzymes typically inactivate after transferring a sulfur atom from an active-site cysteine.
  • Genomic analysis reveals Thi4 genes often cluster with sulfur-relay system components (ThiS, ThiF).

Purpose of the Study:

  • To investigate the potential non-suicide mode of action for bacterial Thi4 enzymes.
  • To explore the interaction of Thi4 with sulfur-relay systems in a heterologous host.

Main Methods:

  • Comparative genomic analysis of Thi4 gene clusters.
  • Heterologous complementation assays in *Escherichia coli* using engineered mutants.
  • Evaluation of Thi4 activity in wild-type and sulfur-relay deficient *E. coli* strains.

Main Results:

  • A representative bacterial Thi4 enzyme showed partial complementation of an *E. coli* thiazole auxotroph (*ΔthiG*).
  • Complementation was less efficient in a triple mutant lacking key sulfur-relay components (*ΔthiG ΔthiF ΔthiS*).
  • Results indicate a potential dependence of bacterial Thi4 on host sulfur relay machinery.

Conclusions:

  • Bacterial Thi4 enzymes may operate in a non-suicide manner, interacting with host sulfur transfer systems.
  • This challenges the traditional view of Thi4 as exclusively "suicidal".
  • Findings provide a basis for future studies on alternative Thi4 functions and accessory proteins.