1887

Abstract

Mimosine is a toxin present in the tree-legume leucaena (), including its root nodules and the root exudates. The leucaena-nodulating sp. strain TAL1145 degrades mimosine (Mid) and utilizes it as a source of carbon and nitrogen. Twelve TAL1145 mutants defective in mimosine degradation (Mid) were made through Tn3Ho, Tn or kanamycin-resistance-cassette insertions. A 5·0 kb I fragment of TAL1145, subcloned from a cosmid clone containing genes for mimosine degradation, complemented most of the Mid mutants. Sequencing this fragment and the adjacent 0·9 kb I fragment identified five genes, , , , and , of which the first three genes encode ABC transporter proteins involved in mimosine uptake, while encodes an aminotransferase required for degrading mimosine into 3-hydroxy-4-pyridone, and is a regulatory gene encoding a LysR-type transcriptional activator. The location of MidA in the periplasm was shown by making two  : :  fusions, which made active alkaline phosphatase in the periplasm. The various  : :  and  : :  fusions were inducible by mimosine, and a  : :  fusion mutant showed β-glucuronidase activity in the leucaena nodules, indicating that is expressed in the nodules. Similarly, a  : :  fusion expressed alkaline phosphatase activity in the leucaena nodules, indicating that mimosine induces transcription in the bacteroids. genes are specific for the Mid strains of leucaena and are absent in strains of other , and spp.

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2003-02-01
2024-04-26
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