Volume 136, Issue 14 e202317789
Forschungsartikel

Ultrafast Biomimetic Oxidative Folding of Cysteine-rich Peptides and Microproteins in Organic Solvents

Dr. Antony Kam

Dr. Antony Kam

School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore, 637551 Singapore

Department of Biological Sciences, Xi'an Jiaotong-Liverpool University, Wuzhong No.111, Renai Road, Suzhou, Jiangsu, 215123 People's Republic of China

These authors contributed equally to this work.

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Dr. Shining Loo

Dr. Shining Loo

School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore, 637551 Singapore

Wisedom Lake Academy of Pharmacy, Xi'an Jiaotong-Liverpool University, Wuzhong No. 111, Renai Road, Suzhou, Jiangsu, 215123 People's Republic of China

These authors contributed equally to this work.

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Dr. Yibo Qiu

Dr. Yibo Qiu

School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore, 637551 Singapore

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Prof. Chuan-Fa Liu

Prof. Chuan-Fa Liu

School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore, 637551 Singapore

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Prof. James P. Tam

Corresponding Author

Prof. James P. Tam

School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore, 637551 Singapore

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First published: 11 February 2024

Abstract

Disulfides in peptides and proteins are essential for maintaining a properly folded structure. Their oxidative folding is invariably performed in an aqueous-buffered solution. However, this process is often slow and can lead to misfolded products. Here, we report a novel concept and strategy that is bio-inspired to mimic protein disulfide isomerase (PDI) by accelerating disulfide exchange rates many thousand-fold. The proposed strategy termed organic oxidative folding is performed under organic solvents to yield correctly folded cysteine-rich microproteins instantaneously without observable misfolded or dead-end products. Compared to conventional aqueous oxidative folding strategies, enormously large rate accelerations up to 113,200-fold were observed. The feasibility and generality of the organic oxidative folding strategy was successfully demonstrated on 15 cysteine-rich microproteins of different hydrophobicity, lengths (14 to 58 residues), and numbers of disulfides (2 to 5 disulfides), producing the native products in a second and in high yield.

Conflict of interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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