Engineered imine reductases and methods for the reductive amination of ketone and amine compounds

Patent metadata

Field	Value
Publication number	US-9803224-B2
Application number	US-201715605061-A
Country	US
Kind code	B2
Filing date	May 25, 2017
Priority date	May 11, 2012
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

The present disclosure provides engineered polypeptides having imine reductase activity, polynucleotides encoding the engineered imine reductases, host cells capable of expressing the engineered imine reductases, and methods of using these engineered polypeptides with a range of ketone and amine substrate compounds to prepare secondary and tertiary amine product compounds.

First claim

What is claimed is:

1. An engineered polypeptide having imine reductase activity, wherein said polypeptide has at least 90% sequence identity to SEQ ID NO:2, and comprises a substitution at a position corresponding to position 280 of SEQ ID NO:2, wherein the amino acid at position 280 has been replaced with an aliphatic or non-polar residue.

2. The engineered polypeptide having imine reductase activity of claim 1 , wherein said polypeptide has at least 90% sequence identity to SEQ ID NO:2, wherein the amino acid at the position corresponding to position 280 of SEQ ID NO:2 has been replaced with leucine.

3. The engineered polypeptide of claim 1 , wherein said polypeptide is capable of converting substrate compound (1a) pyruvate,

and substrate compound (2b) butylamine

to product compound (3b), N-2-(butylamino)propanoic acid,

under suitable reaction conditions.

4. The engineered polypeptide of claim 1 , wherein said polypeptide is capable of converting substrate compound (1b) cyclohexanone,

and substrate compound (2a) L-norvaline

to product compound (3c), (S)-2-(cyclohexylamino)pentanoic acid,

under suitable reaction conditions.

5. The engineered polypeptide of claim 1 , wherein said polypeptide is capable of converting substrate compound (1b) cyclohexanone,

and substrate compound (2b) butylamine

to product compound (3d), N-butylcyclohexanamine,

under suitable reaction conditions.

6. The engineered polypeptide of claim 1 , wherein said polypeptide is capable of converting substrate compound (1i),

and substrate compound (2b)

to product compound (3n),

under suitable reaction conditions.

7. The engineered polypeptide of claim 1 , wherein said polypeptide is capable of converting substrate compound (1j),

and substrate compound (2b)

to product compound (3o),

under suitable reaction conditions.

8. A process for preparing an amine compound of formula (III),

wherein
(a) R 1 and R 2 groups are independently selected from the group consisting of a hydrogen atom, an optionally substituted alkyl, an optionally substituted alkenyl, an optionally substituted alkynyl, an optionally substituted alkoxy, an optionally substituted carboxy, an optionally substituted aminocarbonyl, an optionally substituted heteroalkyl, an optionally substituted heteroalkenyl, an optionally substituted heteroalkynyl, an optionally substituted carboxyalkyl, an optionally substituted aminoalkyl, an optionally substituted haloalkyl, an optionally substituted alkylthioalkyl, an optionally substituted cycloalkyl, an optionally substituted aryl, an optionally substituted arylalkyl, an optionally substituted heterocycloalkyl, an optionally substituted heteroaryl, and an optionally substituted heteroarylalkyl;
(b) R 1 and R 2 are linked to form a 3-membered to 10-membered ring;
(c) R 3 and R 4 groups are independently selected from a hydrogen atom, and optionally substituted alkyl, an optionally substituted alkenyl, an optionally substituted alkynyl, an optionally substituted alkoxy, an optionally substituted carboxy, an optionally substituted aminocarbonyl an optionally substituted heteroalkyl, an optionally substituted heteroalkenyl, an optionally substituted heteroalkynyl, an optionally substituted carboxyalkyl, an optionally substituted aminoalkyl, an optionally substituted haloalkyl, an optionally substituted alkylthioalkyl, an optionally substituted cycloalkyl, an optionally substituted aryl, an optionally substituted arylalkyl, an optionally substituted heterocycloalkyl, an optionally substituted heteroaryl, and an optionally substituted heteroarylalkyl, with the proviso that both R 3 and R 4 cannot be hydrogen;
(d) R 3 and R 4 are linked to form a 3-membered to 10-membered ring;
(e) wherein optionally, the carbon atom and/or the nitrogen indicated by * is chiral; and
(f) at least one of R 1 and R 2 is linked to at least one of R 3 and R 4 ;
the process comprising contacting
a compound of formula (I),

wherein
R 1 , and R 2 are as defined above;

and
a compound of formula (II),

wherein
R 3 , and R 4 are as defined above;

with an engineered polypeptide having imine reductase activity in presence of a cofactor under suitable reaction conditions, wherein the engineered polypeptide is the engineered polypeptide of claim 1 .

9. The process of claim 8 , in which R 3 and R 4 are linked to form a 3-membered to 10-membered ring.

10. The process of claim 8 , in which the substrate compound of formula (II) is selected from methylamine, dimethylamine, isopropylamine, butylamine, isobutylaminel, L-norvaline, aniline, (S)-2-aminopent-4-enoic acid, pyrrolidine, and hydroxypyrrolidine.

11. The process of claim 8 , in which at least one of R 1 and R 2 of the compound of formula (I) is linked to at least one of R 3 and R 4 of the amine compound of formula (II), whereby the process for preparing the amine compound of formula (III) comprises an intramolecular reaction.

12. The process of claim 8 , in which the suitable reaction conditions comprise:
(a) substrate loading at about 10 g/L to 100 g/L;
(b) about 0.1 g/L to about 50 g/L of the engineered polypeptide;
(c) about 0.05 g/L (0.001 M) to about 2.5 g/L (0.050 M) of NAD(P)H;
(d) a pH of about 6 to 10;
(e) temperature of about 20° to 50° C.; and
(f) reaction time of 2-120 hrs.

Assignees

• Codexis Inc

Inventors

• Chen Haibin
• Collier Steven J
• Nazor Jovana
• Sukumaran Joly
• Smith Derek
• Moore Jeffrey C
• Hughes Gregory
• Janey Jacob
• Huisman Gjalt W
• Novick Scott J
• Agard Nicholas J
• Alvizo Oscar
• Cope Gregory A
• Yeo Wan Lin
• Minor Stefanie Ng

Classifications

• C12P17/10

  Nitrogen as only ring hetero atom · CPC title

• C12Y105/01023

  Tauropine dehydrogenase (1.5.1.23) · CPC title

• C12N9/0028 Primary

  with NAD or NADP as acceptor (1.5.1) · CPC title

• C12P13/001

  Amines; Imines · CPC title

• C12P17/12

  containing a six-membered hetero ring · CPC title