Engineering methylaspartate ammonia lyase for the asymmetric synthesis of unnatural amino acids
作者:Hans Raj、Wiktor Szymański、Jandré de Villiers、Henriëtte J. Rozeboom、Vinod Puthan Veetil、Carlos R. Reis、Marianne de Villiers、Frank J. Dekker、Stefaan de Wildeman、Wim J. Quax、Andy-Mark W. H. Thunnissen、Ben L. Feringa、Dick B. Janssen、Gerrit J. Poelarends
DOI:10.1038/nchem.1338
日期:2012.6
predefined transformation remains a major challenge in protein engineering. Here, we describe the structure-basedengineering of methylaspartate ammonia lyase (which in nature catalyses the conversion of 3-methylaspartate to ammonia and 2-methylfumarate) to accept a variety of substituted amines and fumarates and catalyse the asymmetric synthesis of aspartic acid derivatives. We obtained two single-active-site
作者:Maria Khomyakova、Özlem Bükmez、Lorenz K. Thomas、Tobias J. Erb、Ivan A. Berg
DOI:10.1126/science.1196544
日期:2011.1.21
Salt-loving microbes have patched together an alternative carbon assimilation cycle.
嗨!“Salt-loving microbes have patched together an alternative carbon assimilation cycle.”的中文翻译为:“嗜盐微生物已经拼凑出了一种替代的碳同化循环。”
Mechanism of C-3 hydrogen exchange and the elimination of ammonia in the 3-methylaspartate ammonia-lyase reaction
作者:Nigel P. Botting、David Gani
DOI:10.1021/bi00120a031
日期:1992.2.11
(1988) Biochemistry 27, 2956-2959]. The ratio of the rate of exchange to the rate of deamination, however, varied widely with pH. Together with the identical values of the primary isotope effects for the two reactions, this result indicates that the partition betweenreaction pathways occurs after the slowest steps in the common part of the reaction coordinate pathway, almost certainly after the cleavage
Alteration of the Diastereoselectivity of 3-Methylaspartate Ammonia Lyase by Using Structure-Based Mutagenesis
作者:Hans Raj、Barbara Weiner、Vinod Puthan Veetil、Carlos R. Reis、Wim J. Quax、Dick B. Janssen、Ben L. Feringa、Gerrit J. Poelarends
DOI:10.1002/cbic.200900311
日期:2009.9.4
Selective shopping at the MAL(L): The diastereoselectivity of 3‐methylaspartate ammonia‐lyase (MAL) can be strongly enhanced by mutation of the active‐site residues His194, Lys331, and Gln329. The enhancement of the stereoselectivity should make it possible to utilize single amino acid variants of MAL in stereo‐ and regioselective amination reactions to produce 3‐ and N‐substituted aspartic acid derivatives