Biomolecular Click Reactions Using a Minimal pH-Activated Catcher/Tag Pair for Producing Native-Sized Spider-Silk Proteins

Ruxia Fan, Johanna Hakanpää, Karoliina Elfving, Helena Taberman, Markus B. Linder*, A. Sesilja Aranko*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)
102 Downloads (Pure)

Abstract

A type of protein/peptide pair known as Catcher/Tag pair spontaneously forms an intermolecular isopeptide bond which can be applied for biomolecular click reactions. Covalent protein conjugation using Catcher/Tag pairs has turned out to be a valuable tool in biotechnology and biomedicines, but it is essential to increase the current toolbox of orthogonal Catcher/Tag pairs to expand the range of applications further, for example, for controlled multiple-fragment ligation. We report here the engineering of novel Catcher/Tag pairs for protein ligation, aided by a crystal structure of a minimal CnaB domain from Lactobacillus plantarum. We show that a newly engineered pair, called SilkCatcher/Tag enables efficient pH-inducible protein ligation in addition to being compatible with the widely used SpyCatcher/Tag pair. Finally, we demonstrate the use of the SilkCatcher/Tag pair in the production of native-sized highly repetitive spider-silk-like proteins with >90 % purity, which is not possible by traditional recombinant production methods.

Original languageEnglish
Article numbere202216371
Number of pages10
JournalAngewandte Chemie - International Edition
Volume62
Issue number11
Early online date7 Feb 2023
DOIs
Publication statusPublished - 6 Mar 2023
MoE publication typeA1 Journal article-refereed

Keywords

  • Catcher/Tag
  • Protein Engineering
  • Protein Ligation
  • Protein Modifications
  • Spider Silk

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