title: Pyruvate carboxylase is involved in metabolism of mimosine by Rhizobium sp. strain TAL1145.
abstract: The objective of this study was to determine the role of midK, which encodes a protein similar to pyruvate carboxylase, in mimosine degradation by Rhizobium sp. strain TAL1145. The midK gene is located downstream of midR in the cluster of genes for mimosine degradation in Rhizobium sp. strain TAL1145. The midK mutants of TAL1145 degraded mimosine slower than the wild-type. These mutants could utilize pyruvate as a source of carbon, indicating that there is another pyruvate carboxylase (pyc) gene in TAL1145. Two classes of clones were isolated from the library of TAL1145 by complementing a pyc mutant of Rhizobium etli, one class contained midK, while the other carried pyc. Both midK and pyc of TAL1145 complemented the midK mutant for mimosine degradation, and also the R. etli pyc mutant for pyruvate utilization. The midK-encoded pyruvate carboxylase was required for an efficient conversion of mimosine into 3-hydroxy-4-pyridone (HP).
authors.affiliation: Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, 1955 East-West Road, Ag. Science 218, Honolulu, HI 96822, USA.
authors.forename: Jonathan D
authors.initials: JD
authors.lastname: Awaya
authors.forename: Panlada
authors.initials: P
authors.lastname: Tittabutr
authors.forename: Qing X
authors.initials: QX
authors.lastname: Li
authors.forename: Dulal
authors.initials: D
authors.lastname: Borthakur
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D002244:Carbon / Q000378:metabolism; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D023061:Gene Order; D005816:Genetic Complementation Test; D008898:Mimosine / Q000378:metabolism*; D008969:Molecular Sequence Data; D005810:Multigene Family; D050505:Mutant Proteins / Q000235:genetics / Q000378:metabolism; D011728:Pyridones / Q000378:metabolism; D011766:Pyruvate Carboxylase / Q000235:genetics / Q000378:metabolism*; D019289:Pyruvic Acid / Q000378:metabolism; D012231:Rhizobium / Q000201:enzymology* / Q000235:genetics; D017422:Sequence Analysis, DNA
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D050505:Mutant Proteins; D011728:Pyridones; C020366:3-hydroxy-4-pyridone; D008898:Mimosine; D002244:Carbon; D019289:Pyruvic Acid; D011766:Pyruvate Carboxylase