Cloning and sequencing of the genes involved in the conversion of 5-substituted hydantoins to the corresponding L-amino acids from the native plasmid of Pseudomonas sp. strain NS671
作者:K Watabe、T Ishikawa、Y Mukohara、H Nakamura
DOI:10.1128/jb.174.3.962-969.1992
日期:1992.2
Pseudomonas sp. strain NS671, which produces L-aminoacids asymmetrically from the corresponding racemic 5-substituted hydantoins, harbored a plasmid of 172 kb. Curing experiments suggest that this plasmid, designated pHN671, is responsible for the conversion of 5-substituted hydantoins to their corresponding L-aminoacids by strain NS671. DNA fragments containing the genes involved in this conversion
Highly diastereoselective synthesis of 2-monosubstituted 1R,5S(1S,5R)-glycoluriles on the basis of S- and R-N-carbamoyl-α-amino acids
作者:Angelina N. Kravchenko、Konstantin Yu. Chegaev、Il’ya E. Chikunov、Pavel A. Belyakov、Elena Yu. Maksareva、Konstantin A. Lyssenko、Oleg V. Lebedev、Nina N. Makhova
DOI:10.1070/mc2003v013n06abeh001802
日期:2003.1
The reactions of 4,5-dihydroxyimidazolidin-2-one with chiral S- and R-N-carbamoyl-alpha-amino acids occur diastereoselectively with the formation of corresponding 1R,5S(1S,5R)-glycoluriles as predominant diastereomers; the absolute configuration is determined for three stereoisomers by X-ray diffraction analysis.
Synthesis of 1S,5R- and 1R,5S-glycoluriles by diastereospecific α-ureidoalkylation of (S)/(R)-N-carbamoyl-α-amino acids with 4,5-dihydroxyimidazolidin-2-one
作者:Il’ya E. Chikunov、Angelina N. Kravchenko、Pavel A. Belyakov、Konstantin A. Lyssenko、Vladimir V. Baranov、Oleg V. Lebedev、Nina N. Makhova
DOI:10.1070/mc2004v014n06abeh002050
日期:2004.1
A diastereospecific method for the synthesis of individual enantiomers of 1S,5R- and 1R,5S-glycoluriles has been developed based on the α-ureidoalkylation of (S)/(R)-N-carbamoyl-α-amino acids with 4,5-dihydroxyimidazolidin-2-one.
Mechanism of Stereospecific Conversion of<scp>dl</scp>-5-Substituted Hydantoins to the Corresponding<scp>l</scp>-Amino Acids by<i>Pseudomonas</i>sp. Strain NS671
The mechanism of stereospecific conversion of dl-5-substituted hydantoins to the corresponding l-amino acids by Pseudomonas sp. strain NS671 was studied. The results indicated that the hydantoinase catalyzed the hydrolysis reaction of both d-and l-5-(2-methylthioethyl)hydantoin, and that the hydrolysis of the l-enantiomer proceeded preferentially compared with that of the d-enantiomer. On the basis of these findings, the mechanism was speculated to be as follows: dl-5-substituted hydantoins are converted exclusively to the l-forms of the corresponding N-carbamylamino acids by the hydantoinase in combination with hydantoin racemase. The N-carbamyl-l-amino acids are then converted to l-amino acids by N-carbamyl-l-amino acid amidohydrolase.