03-10-2013 дата публикации
Номер: US20130260426A1
Автор:
ALVIZO Oscar,
Ang Ee Lui,
Behrouzian Behnaz,
Clay Michael,
COLLIER Steven,
Eberhard Ellen,
Fu Fan Jaslyn,
SMITH Derek,
Song Shiwei,
Widegren Magnus,
Wilson Robert,
Xu Junye,
ZHU Jun
Принадлежит:
The present invention relates to non-naturally occurring polypeptides useful for preparing armodafinil, polynucleotides encoding the polypeptides, and methods of using the polypeptides. The non-naturally occurring polypeptides of the present invention are effective in carrying out biocatalytic conversion of the (i) 2-(benzhydrylsulfinyl)acetamide to (−)-2-[(R)-(diphenyl-methyl)sulfinyl]acetamide (armodafinil), or (ii) benzhydryl-thioacetic acid to (R)-2-(benzhydrylsulfinyl)acetic acid, which is a pivotal intermediate in the synthesis of armodafinil, in enantiomeric excess. 1. A non-naturally occurring polypeptide having cyclohexanone monooxygenase (CHMO) activity wherein the amino acid sequence of the polypeptide has at least 80% sequence identity to SEQ ID NO: 2 and one or more amino acid differences relative to SEQ ID NO: 2 selected from the following:X143C, E, F, G, H, K, M, P, Q, S, T, or W;X246A, E, G, I, L, N, P, S, T, or V;X277C, D, E, G, H, L, M, P, S, T, V, or W;X278A, C, G, H, K, N, Q, S, T, or V;X280L, T, or W;X281A, C, H, K, L, M, N, R, T, V, W, or Y;X326A, D, E, F, G, H, L, M, N, P, R, V, or W;X426G, Q, or T;X432E, I, K, N, Q, T, V, or W;X433 S;X435G, K, V, or Y;X490A, C, D, E, G, I, L, M, N, S, or Y; andX532M.2. The polypeptide of claim 1 , wherein the polypeptide is capable of converting the acid substrate compound (1b) to compound (2b) (R-enantiomer) or its opposite enantiomer compound (S-enantiomer) with at least 2-fold improved activity relative to the wild-type polypeptide of SEQ ID NO: 2.3. The polypeptide of claim 1 , wherein the amino acid sequence comprises one or more amino acid differences relative to SEQ ID NO: 2 selected from: X143G claim 1 , K claim 1 , M claim 1 , P claim 1 , Q claim 1 , S claim 1 , or W; X246A claim 1 , E claim 1 , G claim 1 , I claim 1 , L claim 1 , P claim 1 , S claim 1 , T claim 1 , or V; X278G claim 1 , or N; X426Q claim 1 , or T; X432E claim 1 , I claim 1 , L claim 1 , Q claim 1 , S claim 1 , T claim 1 , V claim 1 ...
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