Stereochemistry of reactions of the inhibitor/substrates l- and d-β-chloroalanine with β-mercaptoethanol catalysed by l-aspartate aminotransferase and d-amino acid aminotransferase respectively
A versatile synthesis of stereospecificaily labelled D-amino acids and related enzyme inhibitors
作者:B. Svante Axelsson、Kevin J. O'Toole、Philip A. Spencer、Douglas W. Young
DOI:10.1039/c39910001085
日期:——
Stereospecificaily deuteriated isoserines 4, formed from enzymically prepared 3-deuteriated malic acids 2(X = OH) by Curtius rearrangement, have been converted to the deuteriated aziridines 7 and 9 which, on ring-opening and deprotection, yielded samples of the amino acids D-serine and D-cystine and the enzyme inhibitor–substrates D-β-chloroalanine and D-serine O-sulphate which are labelled Stereospecificaily at C-3 with deuterium.
Stereochemistry of reactions of the inhibitor/substrates l- and d-β-chloroalanine with β-mercaptoethanol catalysed by l-aspartate aminotransferase and d-amino acid aminotransferase respectively
作者:Benjamin Adams、Kreingkrai Lowpetch、Faye Thorndycroft、Sheena M. Whyte、Douglas W. Young
DOI:10.1039/b508199h
日期:——
Two members of the α-family of PLP-dependent enzymes, L-aspartate aminotransferase and D-amino acid aminotransferase, have been shown to catalyse β-substitution of L- and D-β-chloroalanine respectively with β-mercaptoethanol, reactions typical of the β-family of PLP-dependent enzymes. The reaction catalysed by L-aspartate aminotransferase has been shown to occur with retention of stereochemistry, a typical outcome for reactions catalysed by β-family enzymes. There are also indications that the reaction catalysed by D-amino acid aminotransferase may involve retention of stereochemistry. Both enzymes have been shown to catalyse exchange at C-3 when the appropriate enantiomer of β-chloroalanine is the substrate.