Volume 58, Issue 44 pp. 15904-15909
Research Article

A Genetically Encoded, Phage-Displayed Cyclic-Peptide Library

Xiaoshan Shayna Wang

Xiaoshan Shayna Wang

Department of Chemistry, Texas A&M University, College Station, TX, 77843-3255 USA

These authors contributed equally to this work.

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Peng-Hsun Chase Chen

Peng-Hsun Chase Chen

Department of Chemistry, Texas A&M University, College Station, TX, 77843-3255 USA

These authors contributed equally to this work.

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J. Trae Hampton

J. Trae Hampton

Department of Chemistry, Texas A&M University, College Station, TX, 77843-3255 USA

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Jeffery M. Tharp

Jeffery M. Tharp

Department of Chemistry, Texas A&M University, College Station, TX, 77843-3255 USA

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Dr. Catrina A. Reed

Dr. Catrina A. Reed

Department of Chemistry, Texas A&M University, College Station, TX, 77843-3255 USA

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Dr. Sukant K. Das

Dr. Sukant K. Das

Department of Chemistry, Texas A&M University, College Station, TX, 77843-3255 USA

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Duen-Shian Wang

Duen-Shian Wang

Department of Pharmaceutical Sciences, UNT Health Science Center, Fort Worth, TX, 76107 USA

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Hamed S. Hayatshahi

Hamed S. Hayatshahi

Department of Pharmaceutical Sciences, UNT Health Science Center, Fort Worth, TX, 76107 USA

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Prof. Dr. Yang Shen

Prof. Dr. Yang Shen

Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, 77843-3218 USA

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Prof. Dr. Jin Liu

Prof. Dr. Jin Liu

Department of Pharmaceutical Sciences, UNT Health Science Center, Fort Worth, TX, 76107 USA

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Prof. Dr. Wenshe Ray Liu

Corresponding Author

Prof. Dr. Wenshe Ray Liu

Department of Chemistry, Texas A&M University, College Station, TX, 77843-3255 USA

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First published: 09 August 2019
Citations: 83

Graphical Abstract

Using amber-codon suppression, Nϵ-acryloyl-lysine was genetically encoded in a phage-displayed peptide library for cyclization with a pre-installed cysteine. Selection from this phage-display library afforded cyclic peptides that bind TEV protease and histone deacetylase, HDAC8, much more strongly than their linear counterparts.

Abstract

Superior to linear peptides in biological activities, cyclic peptides are considered to have great potential as therapeutic agents. To identify cyclic-peptide ligands for therapeutic targets, phage-displayed peptide libraries in which cyclization is achieved by the covalent conjugation of cysteines have been widely used. To resolve drawbacks related to cysteine conjugation, we have invented a phage-display technique in which its displayed peptides are cyclized through a proximity-driven Michael addition reaction between a cysteine and an amber-codon-encoded Nϵ-acryloyl-lysine (AcrK). Using a randomized 6-mer library in which peptides were cyclized at two ends through a cysteine–AcrK linker, we demonstrated the successful selection of potent ligands for TEV protease and HDAC8. All selected cyclic peptide ligands showed 4- to 6-fold stronger affinity to their protein targets than their linear counterparts. We believe this approach will find broad applications in drug discovery.

Conflict of interest

The authors declare no conflict of interest.

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