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Master Transcription Regulators

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...

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A D-2-hydroxyglutarate biosensor based on specific transcriptional regulator DhdR.

Dan Xiao¹, Wen Zhang², Xiaoting Guo³

¹State Key Laboratory of Microbial Technology, Shandong University, Qingdao, People's Republic of China.

Nature Communications

|December 8, 2021

Summary

Researchers developed a D-2-Hydroxyglutarate (D-2-HG) biosensor using the DhdR protein. This tool accurately detects D-2-HG in various samples, aiding cancer research and understanding metabolic pathways.

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Area of Science:

Biochemistry
Metabolomics
Molecular Biology

Background:

D-2-Hydroxyglutarate (D-2-HG) is a key metabolite implicated in various physiological processes.
Aberrant accumulation of D-2-HG, often due to isocitrate dehydrogenase or D-2-HG dehydrogenase mutations, promotes oncogenesis, establishing it as a cancer biomarker and therapeutic target.
Understanding D-2-HG metabolism is crucial for cancer diagnostics and treatment strategies.

Purpose of the Study:

To identify and characterize novel regulators of D-2-HG metabolism.
To develop a sensitive and specific biosensor for D-2-HG detection.
To explore the role of D-2-HG in bacterial metabolic pathways.

Main Methods:

Identification of DhdR from Achromobacter denitrificans NBRC 15125 as an allosteric transcriptional factor regulating D-2-HG dehydrogenase.
Development of a D-2-HG biosensor by integrating DhdR with amplified luminescent proximity homogeneous assay (AlphaScreen) technology.
Validation of the biosensor's performance in detecting D-2-HG in biological samples (serum, urine, cell culture medium) and its application in studying Pseudomonas aeruginosa metabolism.

Main Results:

DhdR was identified as a negative regulator of D-2-HG dehydrogenase expression, allosterically controlled by D-2-HG.
A novel D-2-HG biosensor was successfully developed, demonstrating high specificity and sensitivity.
The biosensor effectively detected D-2-HG in diverse biological matrices and was utilized to elucidate D-2-HG's role in lipopolysaccharide biosynthesis in Pseudomonas aeruginosa.

Conclusions:

The DhdR protein serves as a valuable tool for D-2-HG detection and metabolic studies.
The developed AlphaScreen-based biosensor offers a sensitive and specific method for quantifying D-2-HG in various biological contexts.
This research highlights the broad applicability of the D-2-HG biosensor in both cancer-related research and microbial metabolism investigations.