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• W2080646948 abstract "ABSTRACT Pseudomonas sp. strain KIE171 was able to grow with isopropylamine or l -alaninol [ S -(+)-2-amino-1-propanol] as the sole carbon source, but not with d -alaninol. To investigate the hypothesis that l -alaninol is an intermediate in the degradation of isopropylamine, two mini-Tn 5 mutants unable to utilize both isopropylamine and l -alaninol were isolated. Whereas mutant KIE171-BI transformed isopropylamine to l -alaninol, mutant KIE171-BII failed to do so. The two genes containing a transposon insertion were cloned, and the DNA regions flanking the insertions were sequenced. Two clusters, one comprising eight ipu (isopropylamine utilization) genes ( ipuABCDEFGH ) and the other encompassing two genes ( ipuI and orf259 ), were identified. Comparisons of sequences of the deduced Ipu proteins and those in the database suggested that isopropylamine is transported into the cytoplasm by a putative permease, IpuG. The next step, the formation of γ-glutamyl-isopropylamide from isopropylamine, ATP, and l -glutamate, was shown to be catalyzed by IpuC, a γ-glutamylamide synthetase. γ-Glutamyl-isopropylamide is then subjected to stereospecific monooxygenation by the hypothetical four-component system IpuABDE, thereby yielding γ-glutamyl- l -alaninol [γ( l -glutamyl)- l -hydroxy-isopropylamide]. Enzymatic hydrolysis by a hydrolase, IpuF, was shown to finally liberate l -alaninol and to regenerate l -glutamate. No gene(s) encoding an enzyme for the next step in the degradation of isopropylamine was found in the ipu clusters. Presumably, l -alaninol is oxidized by an alcohol dehydrogenase to yield l -2-aminopropionaldehyde or it is deaminated by an ammonia lyase to propionaldehyde. Genetic evidence indicated that the aldehyde formed is then further oxidized by the hypothetical aldehyde dehydrogenases IpuI and IpuH to either l -alanine or propionic acid, compounds which can be processed by reactions of the intermediary metabolism." @default.
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• W2080646948 date "2002-05-01" @default.
• W2080646948 modified "2023-10-09" @default.
• W2080646948 title "Transformation of Isopropylamine to <scp>l</scp> -Alaninol by <i>Pseudomonas</i> sp. Strain KIE171 Involves <i>N</i> -Glutamylated Intermediates" @default.
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• W2080646948 doi "https://doi.org/10.1128/aem.68.5.2368-2375.2002" @default.
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