Enzymological Characterization of a Novel D-lactate Dehydrogenase from and Its Application in D-phenyllactic Acid Synthesis
Overview
Affiliations
A novel lactate dehydrogenase gene, named , was cloned from and heterologously expressed in . The lactate dehydrogenase LDH is NADH-dependent with a molecular weight of approximately 39 kDa. It is active at 40 °C and pH 6.5 and stable in a neutral to alkaline environment below 35 °C. The kinetic constants, including maximal reaction rate ( ), apparent Michaelis-Menten constant ( ), turnover number ( ) and catalytic efficiency ( / ) for phenylpyruvic acid were 1.95 U mg, 2.83 mM, 12.29 s, and 4.34 mM s, respectively. Using whole cells of recombinant /pET28a-, without coexpression of a cofactor regeneration system, 20.5 g l d-phenyllactic acid with above 99% was produced from phenylpyruvic acid in a fed-batch biotransformation process, with a productivity of 49.2 g l d. Moreover, LDH has broad substrate specificity to a range of ketones, keto acids and ketonic esters. Taken together, LDH is a promising biocatalyst for the efficient synthesis of d-phenyllactic acid and other fine chemicals.
Hu L, Luo R, Wang D, Lin F, Xiao K, Kang Y Front Bioeng Biotechnol. 2024; 12:1470830.
PMID: 39372433 PMC: 11449890. DOI: 10.3389/fbioe.2024.1470830.
Wu W, Chen M, Li C, Zhong J, Xie R, Pan Z Front Microbiol. 2024; 15:1457628.
PMID: 39247693 PMC: 11377314. DOI: 10.3389/fmicb.2024.1457628.
Umanets A, Surono I, Venema K BMC Genomics. 2023; 24(1):518.
PMID: 37667166 PMC: 10478331. DOI: 10.1186/s12864-023-09495-y.
Sun X, Hu J, Wang Y, Luo X, Huang H, Fu Y Front Bioeng Biotechnol. 2023; 10:1124450.
PMID: 36698639 PMC: 9868447. DOI: 10.3389/fbioe.2022.1124450.
Luo X, Wang Y, Zheng W, Sun X, Hu G, Yin L RSC Adv. 2022; 12(51):33251-33259.
PMID: 36425200 PMC: 9677063. DOI: 10.1039/d2ra05599f.