Synthesis of regio- and stereoselectively deuterium-labelled derivatives of l-glutamate semialdehyde for studies on carbapenem biosynthesis
作者:Christian Ducho、Refaat B. Hamed、Edward T. Batchelar、John L. Sorensen、Barbara Odell、Christopher J. Schofield
DOI:10.1039/b903312b
日期:——
on asymmetric deuteration or hydrogenation of appropriate didehydro-amino acid precursors for the stereoselective synthesis of C-2- and/or C-3-[2H]-labelled L-GSA suitable for use in mechanistic studies. Regioselective deuterium incorporation into the 5-position of L-GSA was achieved using a labelled form of the Schwartz reagent (Cp2Zr2HCl). 4,4-Dideuterated and fully backbone deuterated L-GSAs were
L -谷氨酸半醛 ( L -GSA) 是生物合成途径的中间体,包括导致碳青霉烯类抗生素的途径。我们描述不对称氘化或适当的二脱氢氨基酸的前体氢化的C-2位和/或C-3- [立体选择性合成研究2 H] -标记大号-GSA适用于机理研究使用。使用标记形式的 Schwartz 试剂 (Cp 2 Zr 2 HCl)实现区域选择性氘掺入L -GSA的 5 位。制备了4,4-二氘化和完全主链氘化的L -GSA 。标记L的应用-GSA 衍生物用于生物合成研究的例子是使用两种不同的选择性氘化反式羧甲基脯氨酸的化学酶促制备羧甲基脯氨酸合酶(CarB 和 ThnE),催化两种碳青霉烯生物合成早期步骤的酶:(5 R )-carbapenem-3-carboxylate 和硫霉素, 分别。
Thioester Hydrolysis and CC Bond Formation by Carboxymethylproline Synthase from the Crotonase Superfamily
作者:Edward T. Batchelar、Refaat B. Hamed、Christian Ducho、Timothy D. W. Claridge、Mariola J. Edelmann、Benedikt Kessler、Christopher J. Schofield
DOI:10.1002/anie.200803906
日期:2008.11.17
Angiotensin II Analogues Encompassing 5,9- and 5,10-Fused Thiazabicycloalkane Tripeptide Mimetics
solid phase for the construction of new tripeptidic 5,9- and 5,10-fused thiazabicycloalkane scaffolds that adopt beta-turns has been developed. This N-terminal-directed bicyclization, relying on masked aldehyde precursors derivedfrom glutamic acid as key buildingblocks, provides a complement to the related bicyclization previously reported, where an aspartic acid-derived precursor was employed to
Synthesis of deuterium labelled<scp>l</scp>- and<scp>d-</scp>glutamate semialdehydes and their evaluation as substrates for carboxymethylproline synthase (CarB)—implications for carbapenem biosynthesis
作者:John L. Sorensen、Mark C. Sleeman、Christopher J. Schofield
DOI:10.1039/b416423g
日期:——
Carboxymethylproline synthase was shown to condense L-glutamate semialdehyde with malonyl-coenzyme A to produce (2S,5S)-carboxymethylproline, while incubation of D-glutamate semialdehyde results only in uncoupled turnover of malonyl-CoA.