102579-71-5Relevant articles and documents
Biocatalytical Transformations. IV. Enantioselective Enzymatic Hydrolyses of Building Blocks for the Synthesis of Carbocyclic Nucleosides
Csuk, Rene,Doerr, Petra
, p. 269 - 276 (1994)
Enantiomerically pure alkyl (1S,4R)- and (1R,4S)-4-acetamido-cyclopent-2-ene-carboxylates are obtained from their corresponding racemates by hydrolysis with PLE or the lipase from Candida cylindracea.
Identification and application of enantiocomplementary lactamases for Vince lactam derivatives
Assaf, Zeinab,Eger, Elisabeth,Vitnik, Zeljko,Fabian, Walter M. F.,Ribitsch, Doris,Guebitz, Georg M.,Faber, Kurt,Hall, Mélanie
, p. 2517 - 2521 (2014)
Four enzymes showing hydrolytic activity on derivatives of 2-azabicyclo[2.2.1]hept-5-en-3-one (Vince lactam) were successfully identified through analysis of protein crystal structure and amino acid sequence alignments. Enantiocomplementary activities were observed on Vince lactam and its saturated analog 2-azabicyclo[2.2.1]heptan-3-one with non-heme chloroperoxidase (CPO-T) from Streptomyces aureofaciens, cyclic imide hydrolase (CIH) from Pseudomonas putida, polyamidase (NfpolyA) from Nocardia farcinica, and amidase (AMI) from Rhodococcus globerulus, and perfect kinetic resolution was achieved (E>200). Computational analysis of amide bond resonance stabilization in lactams correlated well with the overall reactivity pattern of the lactams as a function of ring size and strain. The biocatalysts cloned and investigated in this study could be of interest for the synthesis of enantiopure carbocyclic nucleoside analogues.
Lipase-catalyzed resolution of 2-azabicyclo[2.2.1]hept-5-en-3-ones
Nakano, Hiroto,Iwasa, Kazuto,Okuyama, Yuko,Hongo, Hiroshi
, p. 2381 - 2386 (1996)
The lipase-catalyzed asymmetric resolution of 2-azabicyclo[2.2.1]hept-5-en-3-ones is reported; non-racemic chiral 2-azabicyclo[2.2.1]hept-5-en-3-ones were obtained conveniently by lipase-catalyzed enantioselective transesterification or hydrolysis of N-hydroxymethyl-2-azabicyclo[2.2.1]hept-5-en-3-one or N-acyloxymethyl-2-azabicyclo[2.2.1]hept-5-en-3-one.
Inhibition and substrate activity of conformationally rigid vigabatrin analogues with γ-aminobutyric acid aminotransferase
Qiu, Jian,Pingsterhaus, Joyce M.,Silverman, Richard B.
, p. 4725 - 4728 (1999)
Several cyclopentene GABA analogues were synthesized as conformationally rigid analogues of the epilepsy drug vigabatrin and tested as inhibitors and substrates of γ-aminobutyric acid aminotransferase (GABA-AT). None of these compounds produced time-dependent inhibition. (1R,4S)-(+)-4-Amino-2- cyclopentene-1-carboxylic acid ((+)-3), (4R)-(-)-4-amino-1-cyclopentene-1- carboxylic acid ((-)-4), and d,l-3-amino-1-cyclopentene-1-carboxylic acid (6) are good substrates. The K(m) and k(cat) values for the latter two compounds are very similar to those of GABA, suggesting that they bind in an orientation similar to that of GABA. The K(m) value for (+)-3 is 24 times lower than that for GABA, although its k(cat) value is only one-fourth that for GABA; nonetheless, it is a better substrate for GABA-AT than is GABA. All of these compounds, as well as the enantiomers of 3 and 4 and d,l-trans-4- amino-2-cyclopentene-1-carboxylic acid (5), are competitive inhibitors of GABA-AT. These results demonstrate the effects of the carboxylate group orientation and the stereochemistry of the amino and carboxylate groups on the substrate activity and inhibitor activity, and this should be important to the future design of inhibitors of GABA-AT.
Enzymatic preparation of optically pure (+)-2-azabicyclo[2.2.1]hept-5-en-3-one by (-)-γ-lactamase from Bradyrhizobium japonicum USDA 6
Zhu, Shaozhou,Ren, Lu,Yu, Songzhu,Gong, Cuiyu,Song, Dawei,Zheng, Guojun
, p. 4899 - 4902 (2014)
Whole cells of Bradyrhizobium japonicum USDA 6 showed both (+)-γ-lactamase activity and (-)-γ-lactamase activity. Insight into the genome of B. japonicum USDA 6 revealed two potential γ-lactamases: a type I (+)-γ-lactamase and a (-)-γ-lactamase, making it the first strain to contain two totally different enantioselective lactamases. Both recombinant enzymes could easily be used to prepare either optically pure (+)-γ-lactam ((+)-2-azabicyclo[2.2.1]hept-5-en-3-one) or optically pure (-)-γ-lactam ((-)-2-azabicyclo[2.2.1]hept-5-en-3-one), which are versatile synthetic building blocks for the synthesis of various carbocyclic nucleosides and carbocyclic sugar analogues. Bioinformatic analysis showed that the type I (+)-γ-lactamase belongs to the amidase signature family, with 504 amino acids; the (-)-γ-lactamase, which consists of 274 amino acids, belongs to the hydrolase family. Here, we report that B. japonicum USDA contains a (-)-γ-lactamase in addition to a (+)-γ-lactamase, and it is the (-)-γ-lactamase from this strain that is examined in detail in this Letter. Enzymatic synthesis of optically pure (+)-γ-lactam with nearly 50% isolated yield and >99% ee was achieved.
Method for synthesizing (1R,4S)-1-amino-4-hydroxymethyl-2-cyclopentene hydrochloride
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Paragraph 0017; 0018, (2017/07/23)
The invention relates to a method for synthesizing (1R,4S)-1-amino-4-hydroxymethyl-2-cyclopentene hydrochloride. According to the method, the reaction conditions are mild, (1S,4R)-(-)-2-azabicyalo[2,2,1]hepta-5-alkene-3-ketone is directly used, (1R,4S)-1-amino-4-hydroxymethyl-2-cyclopentene hydrochloride is obtained through the reactions of hydrolysis and reducing, the yield is high, and the optical purity is high.
Catalytic Promiscuity of Ancestral Esterases and Hydroxynitrile Lyases
Devamani, Titu,Rauwerdink, Alissa M.,Lunzer, Mark,Jones, Bryan J.,Mooney, Joanna L.,Tan, Maxilmilien Alaric O.,Zhang, Zhi-Jun,Xu, Jian-He,Dean, Antony M.,Kazlauskas, Romas J.
supporting information, p. 1046 - 1056 (2016/02/05)
Catalytic promiscuity is a useful, but accidental, enzyme property, so finding catalytically promiscuous enzymes in nature is inefficient. Some ancestral enzymes were branch points in the evolution of new enzymes and are hypothesized to have been promiscuous. To test the hypothesis that ancestral enzymes were more promiscuous than their modern descendants, we reconstructed ancestral enzymes at four branch points in the divergence hydroxynitrile lyases (HNL's) from esterases ～100 million years ago. Both enzyme types are α/β-hydrolase-fold enzymes and have the same catalytic triad, but differ in reaction type and mechanism. Esterases catalyze hydrolysis via an acyl enzyme intermediate, while lyases catalyze an elimination without an intermediate. Screening ancestral enzymes and their modern descendants with six esterase substrates and six lyase substrates found higher catalytic promiscuity among the ancestral enzymes (P 0.01). Ancestral esterases were more likely to catalyze a lyase reaction than modern esterases, and the ancestral HNL was more likely to catalyze ester hydrolysis than modern HNL's. One ancestral enzyme (HNL1) along the path from esterase to hydroxynitrile lyases was especially promiscuous and catalyzed both hydrolysis and lyase reactions with many substrates. A broader screen tested mechanistically related reactions that were not selected for by evolution: decarboxylation, Michael addition, γ-lactam hydrolysis and 1,5-diketone hydrolysis. The ancestral enzymes were more promiscuous than their modern descendants (P = 0.04). Thus, these reconstructed ancestral enzymes are catalytically promiscuous, but HNL1 is especially so.
