Pyrroloquinoline-quinone synthase

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Pyrroloquinoline-quinone synthase
Pyrroloquinoline-quinone synthase
Identifiers
EC no.	1.3.3.11
Databases
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BRENDA	BRENDA entry
ExPASy	NiceZyme view
KEGG	KEGG entry
MetaCyc	metabolic pathway
PRIAM	profile
PDB structures	RCSB PDB PDBe PDBsum
PMC
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Last updated August 27, 2023

In enzymology, a pyrroloquinoline-quinone synthase (EC 1.3.3.11) is an enzyme that catalyzes the chemical reaction

6-(2-amino-2-carboxyethyl)-7,8-dioxo-1,2,3,4,5,6,7,8-octahydroquinoline-2,4-dicarboxylate + 3 O₂

\rightleftharpoons

4,5-dioxo-3a,4,5,6,7,8,9,9b-octahydro-1H-pyrrolo[2,3-f]quinoline- 2,7,9-tricarboxylate + 2 H₂O₂ + 2 H₂O

The two substrates of this enzyme are 6-(2-amino-2-carboxyethyl)-7,8-dioxo-1,2,3,4,5,6,7,8-octahydroquinoline-2,4-dicarboxylate, and O₂, whereas its 3 products are 4,5-dioxo-3a,4,5,6,7,8,9,9b-octahydro-1H-pyrrolo[2,3-f]quinoline-2,7,9-tricarboxylate, H₂O₂, and H₂O.

This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-CH group of donor with oxygen as acceptor. The systematic name of this enzyme class is 6-(2-amino-2-carboxyethyl)-7,8-dioxo-1,2,3,4,5,6,7,8-octahydroquinol ine-2,4-dicarboxylate:oxygen oxidoreductase (cyclizing). This enzyme is also called PqqC.

Related Research Articles

Pyrroloquinoline quinone (PQQ), also called methoxatin, is a redox cofactor and antioxidant. Produced by bacteria, it is found in soil and foods such as kiwifruit, as well as human breast milk. Enzymes using PQQ as a redox cofactor are called quinoproteins and play a variety of redox roles. Quinoprotein glucose dehydrogenase is used as a glucose sensor in bacteria. PQQ stimulates growth in bacteria. Eukaryote targets, including mammalian lactate dehydrogenase, are of more interest to health. It is suggested that PQQ taken as a dietary supplement could promote mitochondrial biogenesis via this pathway as well as PGC-1α.

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<span class="mw-page-title-main">Amine oxidase (copper-containing)</span>

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<span class="mw-page-title-main">L-amino-acid oxidase</span>

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<span class="mw-page-title-main">2-Aminoacetanilide</span> Chemical compound

2-Aminoacetanilide is a chemical compound which is a amino derivative of acetanilide and ortho-isomer of aminoacetanilide. There are two other isomers of aminoacetanilide, 3-aminoacetanilide and 4-aminoacetanilide. Aminoacetanilide derivatives are important synthetic intermediates in heterocyclic and aromatic synthesis. These derivatives have found applications in pharmaceutical industry and dyes and pigment industry.

References

Magnusson OT, Toyama H, Saeki M, Schwarzenbacher R, Klinman JP (2004). "The structure of a biosynthetic intermediate of pyrroloquinoline quinone (PQQ) and elucidation of the final step of PQQ biosynthesis". J. Am. Chem. Soc. 126 (17): 5342–3. doi:10.1021/ja0493852. PMID 15113189.
Klinman JP, Schwarzenbacher R (2004). "Quinone biogenesis: Structure and mechanism of PqqC, the final catalyst in the production of pyrroloquinoline quinone". Proc. Natl. Acad. Sci. U.S.A. 101 (21): 7913–8. doi: 10.1073/pnas.0402640101 . PMC 419531 . PMID 15148379.
Toyama H, Chistoserdova L, Lidstrom ME (1997). "Sequence analysis of pqq genes required for biosynthesis of pyrroloquinoline quinone in Methylobacterium extorquens AM1 and the purification of a biosynthetic intermediate". Microbiology. 143 (2): 595–602. doi: 10.1099/00221287-143-2-595 . PMID 9043136.
Yasunaga K (1975). "[Concept of thrombocytopathy and problems involved in its diagnosis (author's transl)]". Nippon. Ketsueki. Gakkai. Zasshi. 38 (6): 734–40. PMID 1243798.
RC; Stenner-Liewen, F; Liewen, H; Reed, JC; Liddington, RC (2004). "Crystal structure of PqqC from Klebsiella pneumoniae at 2.1 A resolution". Proteins. 56 (2): 401–3. doi: 10.1002/prot.20085 . PMID 15211525. S2CID 11735291.

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v t e Oxidoreductases: CH–CH oxidoreductases (EC 1.3)
1.3.1: NAD/NADP acceptor	Enoyl-acyl carrier protein reductase/Enoyl ACP reductase 7-Dehydrocholesterol reductase Biliverdin reductase 2,4 Dienoyl-CoA reductase Dihydroxymethyloxo-tetrahydroquinoline dehydrogenase
1.3.3: Oxygen acceptor	Dihydroorotate dehydrogenase Coproporphyrinogen III oxidase Protoporphyrinogen oxidase Bilirubin oxidase Acyl-CoA oxidase Dihydrouracil oxidase Tetrahydroberberine oxidase Secologanin synthase Tryptophan alpha,beta-oxidase Pyrroloquinoline-quinone synthase L-galactonolactone oxidase
1.3.5: Quinone	Succinate dehydrogenase SDHA SDHB SDHC SDHD
1.3.99: Other acceptors	Fumarate reductase Butyryl-CoA dehydrogenase Acyl CoA dehydrogenase ACADSB ACADS 5α-reductase SRD5A1 SRD5A2 SRD5A3 Glutaryl-CoA dehydrogenase Isovaleryl coenzyme A dehydrogenase 3-oxo-5beta-steroid 4-dehydrogenase

v t e Enzymes
Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Diffusion-limited enzyme Coenzyme 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)