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Exploring the Substrate Scope of the Bacterial Phosphocholine Transferase AnkX for Versatile Protein Functionalization
Author(s) -
Ochtrop Philipp,
Ernst Stefan,
Itzen Aymelt,
Hedberg Christian
Publication year - 2019
Publication title -
chembiochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.05
H-Index - 126
eISSN - 1439-7633
pISSN - 1439-4227
DOI - 10.1002/cbic.201900200
Subject(s) - surface modification , phosphocholine , substrate (aquarium) , chemistry , enzyme , posttranslational modification , biochemistry , combinatorial chemistry , biology , phospholipid , ecology , membrane , phosphatidylcholine
Site‐specific protein functionalization has become an indispensable tool in modern life sciences. Here, tag‐based enzymatic protein functionalization techniques are among the most versatilely applicable approaches. However, many chemo‐enzymatic functionalization strategies suffer from low substrate scopes of the enzymes utilized for functional labeling probes. We report on the wide substrate scope of the bacterial enzyme AnkX towards derivatized CDP‐choline analogues and demonstrate that AnkX‐catalyzed phosphocholination can be used for site‐specific one‐ and two‐step protein labeling with a broad array of different functionalities, displaying fast second‐order transfer rates of 5×10 2 to 1.8×10 4 m −1 s −1 . Furthermore, we also present a strategy for the site‐specific dual labeling of proteins of interest, based on the exploitation of AnkX and the delabeling function of the enzyme Lem3. Our results contribute to the wide field of protein functionalization, offering an attractive chemo‐enzymatic tag‐based modification strategy for in vitro labeling.