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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Cloning, sequencing and mutagenesis of the genes for aromatic amine dehydrogenase from Alcaligenes faecalis and evolution of amine dehydrogenases.

The nucleotide sequence of the aromatic amine utilization (aau) gene region from Alcaligenes faecalis contained nine genes (orf-1, aauBEDA, orf-2, orf-3, orf-4 and hemE) transcribed in the same direction. The aauB and aauA genes encode the periplasmic aromatic amine dehydrogenase (AADH) large and small subunit polypeptides, respectively, and were homologous to mauB and mauA, the genes for the large and small subunits of methylamine dehydrogenase (MADH). aauE and aauD are homologous to mauE and mauD and apparently carry out the same function of transport and folding of the small subunit polypeptide in the periplasm. No analogues of the mauF, mauG, mauL, mauM and mauN genes responsible for biosynthesis of tryptophan tryptophylquinone (the prosthetic group of amine dehydrogenases) were found in the aau cluster. orf-2 was predicted to encode a small periplasmic monohaem c-type cytochrome. No biological function can be assigned to polypeptides encoded by orf-1, orf-3 and orf-4 and mutations in these genes appeared to be lethal. Mutants generated by insertions into mauD were not able to use phenylethylamine, tyramine and tryptamine as a source of carbon and phenylethylamine, 3'-hydroxytyramine (dopamine) and tyramine as a source of nitrogen, indicating that AADH is the only enzyme involved in utilization of primary amines in A. faecalis. AADH genes are present in Alcaligenes xylosoxydans subsp. xylosoxydans, but not in other beta- and gamma-proteobacteria. Phylogenetic analysis of amine dehydrogenases (MADH and AADH) indicated that AADH and MADH evolutionarily diverged before separation of proteobacteria into existing subclasses.[1]


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