Oxidoreductases;
Acting on paired donors, with incorporation or reduction of molecular oxygen;
With NADH or NADPH as one donor, and incorporation of one atom of oxygen into the other donor

aurachin C:NAD(P)H:oxygen oxidoreductase (4-hydroxy-2-methyl-3-oxo-4-farnesyl-3,4-dihydroquinoline-1-oxide-forming)

aurachin C + NAD(P)H + H+ + O2 = 4-hydroxy-2-methyl-3-oxo-4-[(2E,6E)-farnesyl]-3,4-dihydroquinoline 1-oxide + NAD(P)+ + H2O (overall reaction) [RN:R11382 R11383];
(1a) aurachin C + NAD(P)H + H+ + O2 = 2-hydroxy-1a-methyl-7a-[(2E,6E)-farnesyl]-1a,2-dihydrooxireno[2,3-b]quinolin-7(7aH)-one + NAD(P)+ + H2O [RN:R11384 R11385];
(1b) 2-hydroxy-1a-methyl-7a-[(2E,6E)-farnesyl]-1a,2-dihydrooxireno[2,3-b]quinolin-7(7aH)-one = 4-hydroxy-2-methyl-3-oxo-4-[(2E,6E)-farnesyl]-3,4-dihydroquinoline 1-oxide [RN:R11386]

R11382 R11383 R11384 R11385 R11386

aurachin C [CPD:C21330];
NADH [CPD:C00004];
NADPH [CPD:C00005];
H+ [CPD:C00080];
O2 [CPD:C00007];
2-hydroxy-1a-methyl-7a-[(2E,6E)-farnesyl]-1a,2-dihydrooxireno[2,3-b]quinolin-7(7aH)-one [CPD:C21331]

The aurachin C monooxygenase from the bacterium Stigmatella aurantiaca accepts both NADH and NADPH as cofactor, but has a preference for NADH. It catalyses the initial steps in the conversion of aurachin C to aurachin B. The FAD-dependent monooxygenase catalyses the epoxidation of the C2-C3 double bond of aurachin C, which is followed by a semipinacol rearrangement, causing migration of the farnesyl group from C3 to C4.

EC 1.14.13.222 created 2016

1  [PMID:22907798]

Katsuyama Y, Harmrolfs K, Pistorius D, Li Y, Muller R

A semipinacol rearrangement directed by an enzymatic system featuring dual-function FAD-dependent monooxygenase.

Angew Chem Int Ed Engl 51:9437-40 (2012)
DOI:10.1002/anie.201204138

[ag:CCD27744]