Efficient one-step preparation of γ-aminobutyric acid from glucose without an exogenous cofactor by the designed Corynebacterium glutamicum
作者:Rongzhen Zhang、Taowei Yang、Zhiming Rao、Hongmei Sun、Meijuan Xu、Xian Zhang、Zhenghong Xu、Shangtian Yang
DOI:10.1039/c4gc00607k
日期:——
Lactobacillus plantarum CCTCC M209102 efficiently produces γ-aminobutyric acid (GABA) from L-glutamate, in which glutamate decarboxylase and pyridoxal kinase are involved in the transformation. Pyridoxal kinase catalyzes ATP-dependent phosphorylation of pyridoxal to produce pyridoxal-5′-phosphate, which is the cofactor required for glutamate decarboxylase to biotransform GABA from L-glutamate. Corynebacterium
植物乳杆菌CCTCC M209102有效地从L-谷氨酸生产γ-氨基丁酸(GABA),其中谷氨酸脱羧酶和吡ido醛激酶参与转化。吡rid醛激酶催化吡ido醛的ATP依赖性磷酸化,生成吡ido醛5'-磷酸,这是谷氨酸脱羧酶从L-谷氨酸生物转化GABA所需的辅因子。谷氨酸棒杆菌G01是由葡萄糖生产L-谷氨酸的良好产物。但是,它不能从L生成GABA-谷氨酸,因为不存在谷氨酸脱羧酶和吡ido醛激酶。在这项工作中,为了实现从葡萄糖中无外源吡ido醛5'-磷酸盐的高效一步制备,将基于植物谷氨酸的谷氨酸脱羧酶和吡ido醛激酶的L-谷氨酸转化为GABA的代谢模块嫁接到C中。谷氨酸。为了进一步提高GABA的产量,使用插入突变技术阻断了L-精氨酸,L-脯氨酸和L-赖氨酸副产物库的途径。工程谷氨酸棒杆菌APLGGP携带arg B :: tacgad,pro B ::tacgad和dapA :: tacplk可以一
A thermodynamic insight into the recognition of hydrophilic and hydrophobic amino acids in pure water by aza-scorpiand type receptors
Thermodynamic studies about the interaction of scorpiand aza-macrocycles with amino acids in water show entropy driven stabilisations often associated with solvation/desolvation processes.
在水中关于蝎烯和氮杂大环与氨基酸相互作用的热力学研究表明,熵驱动的稳定化通常与溶解/脱溶过程相关。
Fully Conjugated Two‐Dimensional sp
<sup>2</sup>
‐Carbon Covalent Organic Frameworks as Artificial Photosystem I with High Efficiency
The synthesis of fully conjugated sp2‐carbon covalentorganicframeworks (COF) is extremely challenging given the difficulty of the formation of very stable carbon‐carbon double bonds (‐C=C‐). Here, we report the successful preparation of a 2D COF (TP‐COF) based on triazine as central planar units bridged by sp2‐carbon linkers through the ‐C=C‐ condensation reaction. High‐resolution‐transmission electron
Bioactivation of Benzylamine to Reactive Intermediates in Rodents: Formation of Glutathione, Glutamate, and Peptide Conjugates
作者:Abdul E. Mutlib、Patricia Dickenson、Shiang-Yuan Chen、Robert J. Espina、J. Scott Daniels、Liang-Shang Gan
DOI:10.1021/tx020063q
日期:2002.9.1
pathways, including those independent of P450, were found to produce these intermediates. A previously undocumented pathway included the formation of a new carbon-nitrogen bond that led to a potentially reactiveintermediate, Ar-CH(2)-NH(CO)-X, capable of interacting with various nucleophiles. The origin of this reactiveintermediate is postulated to occur via the formation of either a formamide or carbamic
Are Highly Stable Covalent Organic Frameworks the Key to Universal Chiral Stationary Phases for Liquid and Gas Chromatographic Separations?
作者:Chen Yuan、Wenyan Jia、Ziyun Yu、Yanan Li、Min Zi、Li-Ming Yuan、Yong Cui
DOI:10.1021/jacs.1c11051
日期:2022.1.19
High-performance liquid chromatography (HPLC) and gas chromatography (GC) over chiralstationaryphases (CSPs) represent the most popular and highly applicable technology in the field of chiral separation, but there are currently no CSPs that can be used for both liquid and gas chromatography simultaneously. We demonstrate here that two olefin-linked covalent organic frameworks (COFs) featuring chiralcrown ether