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Related Experiment Video

Updated: May 22, 2026

Radiosynthesis of 1-(2-[18F]Fluoroethyl)-L-Tryptophan using a One-pot, Two-step Protocol

Radiosynthesis of 1-(2-[¹⁸F]Fluoroethyl)-L-Tryptophan using a One-pot, Two-step Protocol

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Tryptophan oxygenation: mechanistic considerations.

James H Naismith¹

¹Biomedical Sciences Research Complex, University of St Andrews, St Andrews, Scotland, U.K. naismith@st-andrews.ac.uk

Biochemical Society Transactions

|May 24, 2012

Summary

This summary is machine-generated.

Tryptophan dioxygenases (TDOs) are enzymes that break down the indole ring of tryptophan. This review explores recent advancements in understanding how TDO enzymes utilize molecular oxygen to cleave the indole ring structure.

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PCR Mutagenesis, Cloning, Expression, Fast Protein Purification Protocols and Crystallization of the Wild Type and Mutant Forms of Tryptophan Synthase

PCR Mutagenesis, Cloning, Expression, Fast Protein Purification Protocols and Crystallization of the Wild Type and Mutant Forms of Tryptophan Synthase

Published on: September 26, 2020

Area of Science:

Biochemistry
Enzymology
Protein Structure

Background:

Tryptophan is typically viewed as a structural amino acid, anchoring hydrophobic regions in proteins.
Chemically, tryptophan is unique as the only polyaromatic amino acid, featuring a reactive indole system.
Enzymes have evolved to modify or break the indole ring, notably the indoleamine/tryptophan dioxygenase (IDO/TDO) superfamily.

Purpose of the Study:

To review recent developments in the understanding of TDO enzymes.
To discuss the mechanisms by which TDO enzymes use activated molecular oxygen to cleave the indole ring.
To highlight the contributions of studies on PrnB to the broader understanding of the TDO superfamily.

Main Methods:

Literature review of recent developments in TDO enzyme research.
Analysis of enzymatic mechanisms involving activated molecular oxygen.
Comparative study of PrnB and other TDO enzymes.

Main Results:

Recent studies provide new insights into the catalytic mechanisms of TDO enzymes.
The electron-rich indole system of tryptophan is key to its enzymatic modification.
PrnB, a novel enzyme, shares early catalytic steps with tryptophan dioxygenases, aiding superfamily understanding.

Conclusions:

TDO enzymes employ activated molecular oxygen to initiate indole ring cleavage.
Understanding TDO mechanisms offers insights into metabolic pathways and enzyme evolution.
Further research on enzymes like PrnB can illuminate the functional diversity within the IDO/TDO superfamily.