Increasing the catalytic performance of a whole cell biocatalyst harboring a cytochrome p450cam system by stabilization of an electron transfer component.
Catalytic activity of a recombinant Escherichia coli whole cell biocatalyst harboring a cytochrome P450cam monooxygenase system from Pseudomonas putida coupled with enzymatic co-factor regeneration was investigated. About 0.7 micromol camphor was hydroxylated per mg dry cells at 4 degrees C in 50 mM Tris/HCl buffer (pH 7.4) when utilizing a stable putidaredoxin (Pdx) mutant, C73S/C85S-Pdx (Cys73Ser, Cys85Ser double mutant), instead of wild-type Pdx, which was about two-fold improvement in the substrate conversion. Ten-micromole camphor was completely hydroxylated at 20 degrees C in 6 h by 15 mg dry cell weight of whole cell biocatalyst including C73S/C85S-Pdx. Thus, modulation of protein-protein interaction in multicomponent enzymatic catalysis in whole cells is important.
Mouri
Tsuyoshi
T
Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan.
Kamiya
Noriho
N
Goto
Masahiro
M
D002164:Camphor / Q000378:metabolism; D019475:Camphor 5-Monooxygenase / Q000378:metabolism*; D002384:Catalysis; D004926:Escherichia coli / Q000201:enzymology* / Q000235:genetics; D005288:Ferredoxins / Q000378:metabolism; D005822:Genetic Vectors; D010957:Plasmids / Q000235:genetics; D016958:Pseudomonas putida / Q000201:enzymology; D011995:Recombination, Genetic
D005288:Ferredoxins; C100137:putidaredoxin; D002164:Camphor; D019475:Camphor 5-Monooxygenase