Bilirubin oxidase

In enzymology, a bilirubin oxidase, BOD or BOx, (EC 1.3.3.5) is an enzyme encoded by a gene in various organisms that catalyzes the chemical reaction

2 bilirubin + O2 2 biliverdin + 2 H2O
bilirubin oxidase
Cartoon representation of the X-ray structure of bilirubin oxidase from Myrothecium verrucaria based on PDB accession code 2xll. The protein ribbon is rainbow colored with the N-terminus in blue and the C-terminus in red. The four copper atoms are shown as spheres and the glycans shown as sticks.
Identifiers
EC number1.3.3.5
CAS number80619-01-8
Databases
IntEnzIntEnz view
BRENDABRENDA entry
ExPASyNiceZyme view
KEGGKEGG entry
MetaCycmetabolic pathway
PRIAMprofile
PDB structuresRCSB PDB PDBe PDBsum
Gene OntologyAmiGO / QuickGO

This enzyme belongs to the family of oxidoreductases, to be specific those acting on the CH-CH group of donor with oxygen as acceptor. The systematic name of this enzyme class is bilirubin:oxygen oxidoreductase. This enzyme is also called bilirubin oxidase M-1. This enzyme participates in porphyrin and chlorophyll metabolism. It is widely studied as a catalyst for oxygen reduction.[1]

Two structures of bilirubin oxidase from the ascomycete Myrothecium verrucaria have been deposited in the Protein Data Bank (accession codes 3abg and 2xll).[2][3]

The active site consists of four copper centers, reminiscent of laccase. These centers are classified as type I (cys, met, his, his), type II (3his), and two type III (2his).

Further reading
  • Murao S, Tanaka N (1981). "A new enzyme bilirubin oxidase produced by Myrothecium verrucaria MT-1". Agricultural and Biological Chemistry. 45 (10): 2383–2384. doi:10.1271/bbb1961.45.2383.
  • Tanaka N, Murao S (1985). "Reaction of bilirubin oxidase produced by Myrothecium verrucaria MT-1". Agricultural and Biological Chemistry. 49 (3): 843–844. doi:10.1271/bbb1961.49.843.
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References
  1. Mano, Nicolas; Edembe, Lise (2013). "Bilirubin oxidases in bioelectrochemistry: Features and recent findings". Biosensors and Bioelectronics. 50: 478–485. doi:10.1016/j.bios.2013.07.014. PMID 23911663.
  2. Mizutani K, Toyoda M, Sagara K, Takahashi N, Sato A, Kamitaka Y, et al. (July 2010). "X-ray analysis of bilirubin oxidase from Myrothecium verrucaria at 2.3 A resolution using a twinned crystal". Acta Crystallographica. Section F, Structural Biology and Crystallization Communications. 66 (Pt 7): 765–70. doi:10.1107/S1744309110018828. PMC 2898457. PMID 20606269.
  3. Cracknell JA, McNamara TP, Lowe ED, Blanford CF (July 2011). "Bilirubin oxidase from Myrothecium verrucaria: X-ray determination of the complete crystal structure and a rational surface modification for enhanced electrocatalytic O2 reduction". Dalton Transactions. 40 (25): 6668–75. doi:10.1039/c0dt01403f. PMID 21544308.
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