A diverse family of thermostable cytochrome P450s created by recombination of stabilizing fragments.
Thermostable enzymes combine catalytic specificity with the toughness required to withstand industrial reaction conditions. Stabilized enzymes also provide robust starting points for evolutionary improvement of other protein properties. We recently created a library of at least 2,300 new active chimeras of the biotechnologically important cytochrome P450 enzymes. Here we show that a chimera's thermostability can be predicted from the additive contributions of its sequence fragments. Based on these predictions, we constructed a family of 44 novel thermostable P450s with half-lives of inactivation at 57 degrees C up to 108 times that of the most stable parent. Although they differ by as many as 99 amino acids from any known P450, the stable sequences are catalytically active. Among the novel functions they exhibit is the ability to produce drug metabolites. This chimeric P450 family provides a unique ensemble for biotechnological applications and for studying sequence-stability-function relationships.
Li
Yougen
Y
Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA.
Drummond
D Allan
DA
Sawayama
Andrew M
AM
Snow
Christopher D
CD
Bloom
Jesse D
JD
Arnold
Frances H
FH
D001711:Biotransformation; D003577:Cytochrome P-450 Enzyme System / Q000737:chemistry* / Q000378:metabolism*; D004795:Enzyme Stability; D006418:Heme; D010446:Peptide Fragments / Q000378:metabolism*; D004364:Pharmaceutical Preparations / Q000737:chemistry / Q000378:metabolism; D017510:Protein Folding; D017434:Protein Structure, Tertiary; D011994:Recombinant Proteins / Q000737:chemistry / Q000378:metabolism*; D011995:Recombination, Genetic; D013379:Substrate Specificity; D013696:Temperature
D010446:Peptide Fragments; D004364:Pharmaceutical Preparations; D011994:Recombinant Proteins; D006418:Heme; D003577:Cytochrome P-450 Enzyme System