Enzyme catalysis in organic solutions

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 9/96 (2006.01) C12N 9/00 (2006.01) C12P 1/00 (2006.01) C12P 21/00 (2006.01) C12P 21/02 (2006.01)

Patent

CA 2222733

Organic enzyme solutions include an ion pair complex of an enzyme and a surfactant, and an organic solvent in which the enzyme-surfactant ion pair is dissolved, the solution having catalytic activity at least an order of magnitude greater than a suspension of an equal amount of the enzyme and organic solvent without ion pair complexes. The enzyme is preferably a hydrolase with an acyl transferase activity and the surfactant is Aerosol OT (sodium bis(2-ethylhexyl) sulfosuccinate) at low concentrations. The organic enzyme solution may be made by obtaining an aqueous solution of an enzyme at a pH of maximal enzyme activity, adding an ionic surfactant to the aqueous solution in an amount sufficient to form an ion pair, and extracting the enzyme-surfactant ion pair into an organic solvent phase without substantial formation of reversed micelles, to produce an anhydrous organic enzyme solution comprising the enzyme-surfactant ion pair dissolved in the organic solvent such that the enzyme retains native structure and substantial catalytic activity. Catalytic solutions according to the invention can be used to catalyze peptide synthesis from acyl donors and nucleophiles.

Solutions enzymatiques organiques incluant un complexe à paire d'ions constitué d'une enzyme et d'un surfactant, et un solvant organique dans lequel la paire d'ions enzyme-surfactant est dissoute, la solution possédant une activité catalytique d'au moins un ordre de grandeur supérieur à une suspension comportant une quantité égale d'enzyme et de solvant organique, sans complexes à paire d'ions. L'enzyme est de préférence une hydrolase ayant une activité d'acyltransférase, et le surfactant est de l'aérosol OT (sodium bis(2-éthylhexyl)sulfosuccinate) en faibles concentrations. La solution enzymatique organique peut être fabriquée par l'obtention d'une solution aqueuse d'une enzyme à un pH d'activité enzymatique maximale, l'ajout d'un surfactant ionique à la solution aqueuse en quantité suffisante pour former une paire d'ions, et l'extraction de la paire d'ions enzyme-surfactant dans une phase de solvant organique sans formation importante de micelles inversées, pour produire une solution enzymatique organique anhydre comprenant la paire d'ions enzyme-surfactant dissoute dans le solvant organique, de sorte que l'enzyme conserve une structure native et une activité catalytique importante. Les solutions catalytiques conformes à l'invention peuvent être utilisées pour catalyser la synthèse peptidique à partir de donneurs d'acyle et de nucléophiles.

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