Directed evolution of phosphite dehydrogenase to cycle noncanonical redox cofactors via universal growth selection platform.
Directed evolution of phosphite dehydrogenase to cycle noncanonical redox cofactors via universal growth selection platform.
复制标题
DOI:
10.1038/s41467-022-32727-w
复制
发表时间:
2022-08-26
影响因子:
16.6
通讯作者:
中科院分区:
文献类型:
--
作者:
Noncanonical redox cofactors are attractive low-cost alternatives to nicotinamide adenine dinucleotide (phosphate) (NAD(P)+) in biotransformation. However, engineering enzymes to utilize them is challenging. Here, we present a high-throughput directed evolution platform which couples cell growth to the in vivo cycling of a noncanonical cofactor, nicotinamide mononucleotide (NMN+). We achieve this by engineering the life-essential glutathione reductase in Escherichia coli to exclusively rely on the reduced NMN+ (NMNH). Using this system, we develop a phosphite dehydrogenase (PTDH) to cycle NMN+ with ~147-fold improved catalytic efficiency, which translates to an industrially viable total turnover number of ~45,000 in cell-free biotransformation without requiring high cofactor concentrations. Moreover, the PTDH variants also exhibit improved activity with another structurally deviant noncanonical cofactor, 1-benzylnicotinamide (BNA+), showcasing their broad applications. Structural modeling prediction reveals a general design principle where the mutations and the smaller, noncanonical cofactors together mimic the steric interactions of the larger, natural cofactors NAD(P)+. Engineering enzymes to utilize the noncanonical redox cofactors such as nicotinamide mononucleotide (NMN + ) is challenging. Here, the authors report a growth-based selection platform for NMN + -reducing enzyme engineering and show its application in developing a phosphite dehydrogenase with improved catalytic efficiency.
登录
查看更多内容
影响因子:
7.7
作者:
King E;Maxel S;Li H
通讯作者:
Li H
影响因子:
15
作者:
Knaus T;Paul CE;Levy CW;de Vries S;Mutti FG;Hollmann F;Scrutton NS
通讯作者:
Scrutton NS
影响因子:
2.4
作者:
Cahn, J. K. B.;Baumschlager, A.;Arnold, F. H.
通讯作者:
Arnold, F. H.
影响因子:
16.6
作者:
Crook, Nathan;Abatemarco, Joseph;Sun, Jie;Wagner, James M.;Schmitz, Alexander;Alper, Hal S.
通讯作者:
Alper, Hal S.
影响因子:
48
作者:
Gibson, Daniel G.;Young, Lei;Smith, Hamilton O.
通讯作者:
Smith, Hamilton O.