IUBMB Enzyme Nomenclature


Accepted name: pulcherriminic acid synthase

Reaction: cyclo(L-leucyl-L-leucyl) + 6 reduced ferredoxin + 3 O2 = pulcherriminic acid + 6 oxidized ferredoxin + 4 H2O

For diagram of reaction click here.

Glossary: cyclo(L-leucyl-L-leucyl) = (3S,6S)-3,6-bis(2-methylpropyl)piperazine-2,5-dione
pulcherriminic acid = 2,5-dihydroxy-3,6-bis(2-methylpropyl)pyrazine bis-N-oxide

Other name(s): cyclo-L-leucyl-L-leucyl dipeptide oxidase; CYP134A1; CypX (ambiguous)

Systematic name: cyclo(L-leucyl-L-leucyl),reduced-ferredoxin:oxygen oxidoreductase (N-hydroxylating,aromatizing)

Comments: A heme-thiolate (P-450) enzyme from the bacterium Bacillus subtilis. The order of events during the overall reaction is unknown. Pulcherrimic acid spontaneously forms an iron chelate with Fe(3+) to form the red pigment pulcherrimin [2].

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number:


1. MacDonald, J.C. Biosynthesis of pulcherriminic acid. Biochem. J. 96 (1965) 533-538. [PMID: 5837792]

2. Cryle, M.J., Bell, S.G. and Schlichting, I. Structural and biochemical characterization of the cytochrome P450 CypX (CYP134A1) from Bacillus subtilis: a cyclo-L-leucyl-L-leucyl dipeptide oxidase. Biochemistry 49 (2010) 7282-7296. [PMID: 20690619]

[EC created 2013]

Return to EC 1.14.15 home page
Return to EC 1.14 home page
Return to EC 1 home page
Return to Enzymes home page
Return to IUBMB Biochemical Nomenclature home page