Parent Class:

EC-Numbers → 1 -- Oxidoreductases → 1.1 -- Acting on the CH-OH group of donors → 1.1.9 -- With a copper protein as acceptor

Synonyms: type II quinoprotein alcohol dehydrogenase, quinohaemoprotein ethanol dehydrogenase, QHEDH, ADHIIB

Systematic Name: alcohol:azurin oxidoreductase

Unification Links: BRENDA:1.1.9.1, ENZYME:1.1.9.1, IUBMB-ExplorEnz:1.1.9.1

Supersedes EC number: 1.1.98.1

Reaction:
a primary alcohol + 2 oxidized azurin → an aldehyde + 2 reduced azurin + 2 H⁺

Enzymes and Genes:
alcohol dehydrogenase (azurin): qheDH ( Comamonas testosteroni )

Summary:
A soluble, periplasmic PQQ-containing quinohaemoprotein. Also contains a single heme c. Occurs in Comamonas and Pseudomonas. Does not require an amine activator. Oxidises a wide range of primary and secondary alcohols, and also aldehydes and large substrates such as sterols; methanol is not a substrate. Usually assayed with phenazine methosulphate or ferricyanide. Like all other quinoprotein alcohol dehydrogenases it has an 8-bladed propeller structure, a calcium ion bound to the PQQ in the active site and an unusual disulphide ring structure in close proximity to the PQQ.

Citations: [Groen86, deJong95, Toyama95, Matsushita99, Chen02, Oubrie02]

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References

Chen02: Chen ZW, Matsushita K, Yamashita T, Fujii TA, Toyama H, Adachi O, Bellamy HD, Mathews FS (2002). "Structure at 1.9 A resolution of a quinohemoprotein alcohol dehydrogenase from Pseudomonas putida HK5." Structure 10(6);837-49. PMID: 12057198

deJong95: de Jong GA, Caldeira J, Sun J, Jongejan JA, de Vries S, Loehr TM, Moura I, Moura JJ, Duine JA (1995). "Characterization of the interaction between PQQ and heme c in the quinohemoprotein ethanol dehydrogenase from Comamonas testosteroni." Biochemistry 34(29);9451-8. PMID: 7626615

Groen86: Groen BW, van Kleef MA, Duine JA (1986). "Quinohaemoprotein alcohol dehydrogenase apoenzyme from Pseudomonas testosteroni." Biochem J 234(3);611-5. PMID: 3521592

Matsushita99: Matsushita K, Yamashita T, Aoki N, Toyama H, Adachi O (1999). "Electron transfer from quinohemoprotein alcohol dehydrogenase to blue copper protein azurin in the alcohol oxidase respiratory chain of Pseudomonas putida HK5." Biochemistry 38(19);6111-8. PMID: 10320337

Oubrie02: Oubrie A, Rozeboom HJ, Kalk KH, Huizinga EG, Dijkstra BW (2002). "Crystal structure of quinohemoprotein alcohol dehydrogenase from Comamonas testosteroni: structural basis for substrate oxidation and electron transfer." J Biol Chem 277(5);3727-32. PMID: 11714714

Toyama95: Toyama H, Fujii A, Matsushita K, Shinagawa E, Ameyama M, Adachi O (1995). "Three distinct quinoprotein alcohol dehydrogenases are expressed when Pseudomonas putida is grown on different alcohols." J Bacteriol 177(9);2442-50. PMID: 7730276

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Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 46(D1):D633-D639 2018
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