Arsenate reductase (azurin)

Arsenate reductase (azurin) (EC 1.20.9.1) is an enzyme that catalyzes the chemical reaction

arsenite + H₂O + 2 azurin_ox

\rightleftharpoons

arsenate + 2 azurin_red + 2 H⁺

The 3

substrates of this enzyme are arsenite, water, and oxidised azurin, whereas its 3 products are arsenate, reduced azurin, and hydrogen ion

Classification

This enzyme belongs to the family of oxidoreductases, specifically those acting on phosphorus or arsenic in donor with a copper protein as acceptor.

The systematic name of this enzyme class is arsenite:azurin oxidoreductase. This enzyme is also called arsenite oxidase.

The enzyme contains a molybdopterin centre comprising two molybdopterin guanosine dinucleotide cofactors bound to molybdenum, a [3Fe-4S] cluster and a Rieske-type [2Fe-2S] cluster. Also uses a c-type cytochrome or O
₂ as acceptors.

Anderson GL, Williams J, Hille R (1992). "The purification and characterization of arsenite oxidase from Alcaligenes faecalis, a molybdenum-containing hydroxylase". J. Biol. Chem. 267 (33): 23674–82.
PMID 1331097
.

Ellis PJ, Conrads T, Hille R, Kuhn P (2001). "Crystal structure of the 100 kDa arsenite oxidase from Alcaligenes faecalis in two crystal forms at 1.64 A and 2.03 A". Structure. 9 (2): 125–32.
PMID 11250197
.

v t e Other oxidoreductases (EC 1.15–1.21)
1.15: Acting on superoxide as acceptor	Superoxide dismutase SOD1 SOD2 SOD3
1.16: Oxidizing metal ions	Ceruloplasmin (Methionine synthase) reductase
1.17: Acting on CH or CH2 groups	Xanthine oxidase Ribonucleotide reductase 4-Hydroxy-3-methylbut-2-enyl diphosphate reductase 7-Hydroxymethyl chlorophyll a reductase
iron–sulfur proteins as donors	Nitrogenase
1.19: Acting on reduced flavodoxin as donor	Nitrogenase (flavodoxin)
1.20: Acting on phosphorus or arsenic in donors	Glutaredoxin GLRX GLRX2 GLRX3 GLRX5
1.21: Acting on X-H and Y-H to form an X-Y bond	Isopenicillin N synthase Columbamine oxidase Reticuline oxidase Sulochrin oxidase (+)-bisdechlorogeodin-forming (-)-bisdechlorogeodin-forming Aureusidin synthase Tetrahydrocannabinolic acid synthase Cannabidiolic acid synthase Dichlorochromopyrrolate synthase

v t e Enzymes
Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Diffusion-limited enzyme Cofactor Enzyme catalysis
Regulation	Allosteric regulation Cooperativity Enzyme inhibitor Enzyme activator
Classification	EC number Enzyme superfamily Enzyme family List of enzymes
Kinetics	Enzyme kinetics Eadie–Hofstee diagram Hanes–Woolf plot Lineweaver–Burk plot Michaelis–Menten kinetics
Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list) EC7 Translocases (list)