Download MendeleyDirected evolution of an alpha 1,3-fucosyltransferase using a single-cell ultrahigh-throughput screening method.
Tan, Y., Zhang, Y., Han, Y., Liu, H., Chen, H., Ma, F., Withers, S.G., Feng, Y., Yang, G.(2019) Sci Adv 5: eaaw8451-eaaw8451
- PubMed: 31633018
- DOI: https://doi.org/10.1126/sciadv.aaw8451
- Primary Citation of Related Structures:
5ZOI - PubMed Abstract:
Fucosylated glycoconjugates are involved in a variety of physiological and pathological processes. However, economical production of fucosylated drugs and prebiotic supplements has been hampered by the poor catalytic efficiency of fucosyltransferases. Here, we developed a fluorescence-activated cell sorting system that enables the ultrahigh-throughput screening (>10 7 mutants/hour) of such enzymes and designed a companion strategy to assess the screening performance of the system. After three rounds of directed evolution, a mutant M32 of the α1,3-FucT from Helicobacter pylori was identified with 6- and 14-fold increases in catalytic efficiency ( k cat / K m ) for the synthesis of Lewis x and 3'-fucosyllactose, respectively. The structure of the M32 mutant revealed that the S45F mutation generates a clamp-like structure that appears to improve binding of the galactopyranose ring of the acceptor substrate. Moreover, molecular dynamic simulations reveal that helix α5, is more mobile in the M32 mutant, possibly explaining its high fucosylation activity.
Organizational Affiliation:
State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China.
