Volume 63, Issue 14 e202318897
Research Article

An Enzyme-Cleavable Solubilizing-Tag Facilitates the Chemical Synthesis of Mirror-Image Proteins

Yupeng Zheng

Yupeng Zheng

Department of Hematology, The First Affiliated Hospital of University of Science and Technology of China (USTC), MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, and Division of Life Sciences and Medicine, Hefei National Research Center for Interdisciplinary Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230001 China

Department of Chemistry, Tsinghua University, Beijing, 100084 China

These authors contributed equally to this work.

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Baochang Zhang

Baochang Zhang

Department of Hematology, The First Affiliated Hospital of University of Science and Technology of China (USTC), MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, and Division of Life Sciences and Medicine, Hefei National Research Center for Interdisciplinary Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230001 China

Department of Chemistry, Tsinghua University, Beijing, 100084 China

These authors contributed equally to this work.

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Wei-Wei Shi

Wei-Wei Shi

Department of Chemistry, Tsinghua University, Beijing, 100084 China

These authors contributed equally to this work.

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Xiangyu Deng

Xiangyu Deng

Department of Chemistry, Tsinghua University, Beijing, 100084 China

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Tong-Yue Wang

Tong-Yue Wang

Department of Chemistry, Tsinghua University, Beijing, 100084 China

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Dongyang Han

Dongyang Han

Department of Chemistry, Tsinghua University, Beijing, 100084 China

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Yuxiang Ren

Yuxiang Ren

Department of Chemistry, Tsinghua University, Beijing, 100084 China

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Ziyi Yang

Ziyi Yang

Department of Chemistry, Tsinghua University, Beijing, 100084 China

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Yong-Kang Zhou

Yong-Kang Zhou

Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, 230027 China

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Jian Kuang

Jian Kuang

Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026 China

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Zhi-Wen Wang

Zhi-Wen Wang

Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026 China

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Prof. Shan Tang

Prof. Shan Tang

Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, 230027 China

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Prof. Ji-Shen Zheng

Corresponding Author

Prof. Ji-Shen Zheng

Department of Hematology, The First Affiliated Hospital of University of Science and Technology of China (USTC), MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, and Division of Life Sciences and Medicine, Hefei National Research Center for Interdisciplinary Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230001 China

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First published: 07 February 2024
Citations: 13

Graphical Abstract

An enzyme-cleavable solubilizing tag was described for the chemical synthesis of mirror-image proteins. Solubilizing tags were easily installed on the side chain groups of DLys/DSer/DThr and the N-terminal α-amino group of D-peptides via an L-Lys linker. Solubilizing tags were impervious to various commonly used reagents in D-protein synthesis. After protein assembly, multiple solubilizing tags can be removed under denaturing conditions.

Abstract

Mirror-image proteins (D-proteins) are useful in biomedical research for purposes such as mirror-image screening for D-peptide drug discovery, but the chemical synthesis of many D-proteins is often low yielding due to the poor solubility or aggregation of their constituent peptide segments. Here, we report a Lys-C protease-cleavable solubilizing tag and its use to synthesize difficult-to-obtain D-proteins. Our tag is easily installed onto multiple amino acids such as DLys, DSer, DThr, and/or the N-terminal amino acid of hydrophobic D-peptides, is impervious to various reaction conditions, such as peptide synthesis, ligation, desulfurization, and transition metal-mediated deprotection, and yet can be completely removed by Lys-C protease under denaturing conditions to give the desired D-protein. The efficacy and practicality of the new method were exemplified in the synthesis of two challenging D-proteins: D-enantiomers of programmed cell death protein 1 IgV domain and SARS-CoV-2 envelope protein, in high yield. This work demonstrates that the enzymatic cleavage of solubilizing tags under denaturing conditions is feasible, thus paving the way for the production of more D-proteins.

Conflict of interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the Supporting Information of this article.

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