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Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes

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Sequence-Specific 2-Cyanobenzothiazole Ligation.

Carlo P Ramil¹, Peng An¹, Zhipeng Yu¹

¹Department of Chemistry, State University of New York at Buffalo , Buffalo, New York 14260, United States.

Journal of the American Chemical Society

|April 16, 2016

Summary

This summary is machine-generated.

Researchers discovered a new peptide tag, CX10R7, that enables efficient and specific protein labeling using 2-cyanobenzothiazole (CBT) in cellular environments. This method minimizes disruption to protein function, offering a streamlined approach for biological research.

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Area of Science:

Chemical Biology
Molecular Biology
Biotechnology

Background:

Protein labeling is crucial for studying biological processes.
Current methods often involve harsh conditions or complex catalysts, potentially perturbing protein function.
There is a need for efficient, catalyst-free bioorthogonal reactions for in-cell protein labeling.

Purpose of the Study:

To discover a novel peptide tag for site-specific protein labeling.
To develop a catalyst-free bioorthogonal reaction for labeling proteins in cellular environments.
To characterize the reactivity and specificity of the newly discovered peptide tag.

Main Methods:

Screening a cysteine-encoded peptide phage library using the phage-assisted interrogation of reactivity method.
Engineering a 2-cyanobenzothiazole (CBT)-reactive peptide tag, named CX10R7.
Fusing CX10R7 with proteins of interest and performing site-specific labeling in vitro and on E. coli cell surfaces.
Conducting mutagenesis studies to understand the factors influencing tag reactivity and specificity.

Main Results:

Discovery and characterization of the CX10R7 peptide tag, which reacts with 2-cyanobenzothiazole (CBT).
Demonstration of site-specific protein labeling using CX10R7-fusion proteins, both in vitro and on the surface of E. coli.
Identification of the surrounding amino acid sequence as critical for stabilizing the ligation product and ensuring reactivity and specificity.

Conclusions:

The CX10R7 peptide tag provides a novel, efficient, and catalyst-free method for bioorthogonal protein labeling.
This approach minimizes perturbation to protein function, making it suitable for cellular applications.
The findings advance the development of tools for protein engineering and biochemical studies.