Genetic analyses and molecular characterization of the pathways involved in the conversion of 2-phenylethylamine and 2-phenylethanol into phenylacetic acid in Pseudomonas putida U.
In Pseudomonas putida U two different pathways (Pea, Ped) are required for the conversion of 2-phenylethylamine and 2-phenylethanol into phenylacetic acid. The 2-phenylethylamine pathway (PeaABCDEFGHR) catalyses the transport of this amine, its deamination to phenylacetaldehyde by a quinohaemoprotein amine dehydrogenase and the oxidation of this compound through a reaction catalysed by a phenylacetaldehyde dehydrogenase. Another catabolic route (PedS(1)R(1)ABCS(2)R(2)DEFGHI) is needed for the uptake of 2-phenylethanol and for its oxidation to phenylacetic acid via phenylacetaldehyde. This implies the participation of two different two-component signal-transducing systems, two quinoprotein alcohol dehydrogenases, a cytochrome c, a periplasmic binding protein, an aldehyde dehydrogenase, a pentapeptide repeat protein and an ABC efflux system. Additionally, two accessory sets of elements (PqqABCDEF and CcmABCDEFGHI) are necessary for the operation of the main pathways (Pea and Ped). PqqABCDEF is required for the biosynthesis of pyrroloquinoline quinone (PQQ), a prosthetic group of certain alcohol dehydrogenases that transfers electrons to an independent cytochrome c; whereas CcmABCDEFGHI is required for cytochrome c maturation. Our data show that the degradation of phenylethylamine and phenylethanol in P. putida U is quite different from that reported in Escherichia coli, and they demonstrate that PeaABCDEFGHR and PedS(1)R(1)ABCS(2)R(2)DEFGHI are two upper routes belonging to the phenylacetyl-CoA catabolon.
Arias
Sagrario
S
Departamento de Biología Molecular, Facultades de Veterinaria y de Biología, Universidad de León, 24007 León, España.
Olivera
Elías R
ER
Arcos
Mario
M
Naharro
Germán
G
Luengo
José M
JM
D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism; D001673:Biodegradation, Environmental; D015964:Gene Expression Regulation, Bacterial; D008969:Molecular Sequence Data; D005810:Multigene Family; D009154:Mutation; D010627:Phenethylamines / Q000378:metabolism*; D010648:Phenylacetates / Q000378:metabolism*; D010626:Phenylethyl Alcohol / Q000378:metabolism*; D016958:Pseudomonas putida / Q000201:enzymology / Q000235:genetics / Q000378:metabolism*; D017422:Sequence Analysis, DNA; D015398:Signal Transduction
D001426:Bacterial Proteins; D010627:Phenethylamines; D010648:Phenylacetates; C029261:phenethylamine; C025136:phenylacetic acid; D010626:Phenylethyl Alcohol