Directed Evolution of a Fluorinase for Improved Fluorination Efficiency with a Non‐native Substrate. (14th October 2016)

• Record Type: Journal Article
• Authors: Sun, Huihua; Yeo, Wan Lin; Lim, Yee Hwee; Chew, Xinying; Smith, Derek John; Xue, Bo; Chan, Kok Ping; Robinson, Robert C.; Robins, Edward G.; Zhao, Huimin; Ang, Ee Lui
• Is Part Of: Angewandte Chemie. Volume 128:Number 46(2016)
• Page Start: 14489
• Page End: 14492
• Publication Date: 2016-10-14
• Subjects: Biokatalyse -- Fluorinasen -- Gerichtete Evolution -- Halogenierungen -- Radiosynthesen; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201606722
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Fluorinases offer an environmentally friendly alternative for selective fluorination under mild conditions. However, their diversity is limited in nature and they have yet to be engineered through directed evolution. Herein, we report the directed evolution of the fluorinase FlA1 for improved conversion of the non‐native substrate 5′‐chloro‐5′‐deoxyadenosine (5′‐ClDA) into 5′‐fluoro‐5′‐deoxyadenosine (5′‐FDA). The evolved variants, fah2081 (A279Y) and fah2114 (F213Y, A279L), were successfully applied in the radiosynthesis of 5′‐[ 18 F]FDA, with overall radiochemical conversion (RCC) more than 3‐fold higher than wild‐type FlA1. Kinetic studies of the two‐step reaction revealed that the variants show a significantly improved k cat value in the conversion of 5′‐ClDA into S ‐adenosyl‐l ‐methionine (SAM) but a reduced k cat value in the conversion of SAM into 5′‐FDA.