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In Situ Cyclization of Native Proteins: Structure‐Based Design of a Bicyclic Enzyme
Author(s) -
PelayGimeno Marta,
Bange Tanja,
Hennig Sven,
Grossmann Tom N.
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201804506
Subject(s) - bicyclic molecule , sortase a , in situ , chemistry , protein design , amino acid , enzyme , cysteine , denaturation (fissile materials) , combinatorial chemistry , protein structure , protein tertiary structure , stereochemistry , biochemistry , organic chemistry , bacterial protein , nuclear chemistry , gene
Increased tolerance of enzymes towards thermal and chemical stress is required for many applications and can be achieved by macrocyclization of the enzyme resulting in the stabilizing of its tertiary structure. Thus far, macrocyclization approaches utilize a very limited structural diversity, which complicates the design process. Herein, we report an approach that enables cyclization through the installation of modular crosslinks into native proteins composed entirely of proteinogenic amino acids. Our stabilization procedure involves the introduction of three surface‐exposed cysteine residues, which are reacted with a triselectrophile, resulting in the in situ cyclization of the protein (INCYPRO). A bicyclic version of sortase A was designed that exhibits increased tolerance towards thermal as well as chemical denaturation, and proved to be efficient in protein labeling under denaturing conditions. In addition, we applied INCYPRO to the KIX domain, resulting in up to 24 °C increased thermal stability.