1.14.13.101: senecionine N-oxygenase

This is an abbreviated version!
For detailed information about senecionine N-oxygenase, go to the full flat file.

Reaction

senecionine
+
NADPH
+
H+
+
O2
=
senecionine N-oxide
+
NADP+
+
H2O

Synonyms

GgPNO, oxygenase, senecionine N-, PA N-oxygenase, PNO, senecionine monooxygenase (N-oxide-forming), senecionine N-oxygenase, SNO, TjSNO

ECTree

     1 Oxidoreductases
         1.14 Acting on paired donors, with incorporation or reduction of molecular oxygen
             1.14.13 With NADH or NADPH as one donor, and incorporation of one atom of oxygen into the other donor
                1.14.13.101 senecionine N-oxygenase

Systematic Name

Systematic Name on EC 1.14.13.101 - senecionine N-oxygenase

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SYSTEMATIC NAME
IUBMB Comments
senecionine,NADPH:oxygen oxidoreductase (N-oxide-forming)
A flavoprotein. NADH cannot replace NADPH. While pyrrolizidine alkaloids of the senecionine and monocrotaline types are generally good substrates (e.g. senecionine, retrorsine and monocrotaline), the enzyme does not use ester alkaloids lacking an hydroxy group at C-7 (e.g. supinine and phalaenopsine), 1,2-dihydro-alkaloids (e.g. sarracine) or unesterified necine bases (e.g. senkirkine) as substrates [1]. Senecionine N-oxide is used by insects as a chemical defense: senecionine N-oxide is non-toxic, but it is bioactivated to a toxic form by the action of cytochrome P-450 oxidase when absorbed by insectivores.