L-3,4-二羟基苯丙氨酸 (L-DOPA) 作为治疗帕金森病的基石,需求量很大。目前生产的左旋多巴生产效率低,生产周期长。开发了受酪氨酸羟化酶启发的仿生系统,以实现具有高反应性、效率和特异性的酪氨酸生产 L-DOPA。与酪氨酸羟化酶相比,该仿生系统在成分和结构上非常相似,以酪氨酸为底物,以Fe 2+和EDTA为催化剂的氧化还原络合物模拟天然酪氨酸羟化酶的活性中心,过氧化氢为氧化剂。 , 和抗坏血酸作为还原剂。高效液相色谱,高效液相色谱-质谱/质谱,1生成了 H NMR 和比旋光度鉴定的 L-DOPA。该系统对酪氨酸的羟基化表现出与酪氨酸羟化酶相当的高催化活性和区域选择性。Fe IV O 2+作为主要的活性物种形成,并且观察到NIH偏移。EDTA通过降低Fe 3+ /Fe 2+对的氧化还原电位来加速反应。密度泛函理论计算表明,Fe IV O 2+的形成在热力学上更有利。该仿生系统与 TyrH
AQUEOUS COMPOSITIONS FOR HAIR TREATMENT COMPRISING POLYORGANOSILOXANES WITH POLYHYDROXYAROMATIC MOIETIES
申请人:Momentive Performance Materials Inc.
公开号:US20180346653A1
公开(公告)日:2018-12-06
This invention relates to aqueous compositions for hair treatment, comprising polyorganosiloxanes A) having di- and trihydroxy-substituted aromatic groups and at least one surfactant B) selected from cationic surfactants B1) and anionic surfactants B2) in a certain weight ratio of the surfactant B) to the polyorganosiloxane A), and said aqueous compositions having a certain pH. The invention further relates to hair treatment compositions, comprising said aqueous compositions and to hair treatment processes using said aqueous compositions or hair treatment compositions.
The invention relates to orthogonal pairs of tRNAs and aminoacyl-tRNA synthetases that can incorporate the coumarin unnatural amino acid L-(7-hydroxycoumarin-4-yl) ethylglycine into proteins produced in eubacterial host cells such as
E. coli
. The invention provides, for example but not limited to, novel orthogonal synthetases, methods for identifying and making the novel synthetases, methods for producing proteins containing the unnatural amino acid L-(7-hydroxycoumarin-4-yl)ethylglycine and related translation systems.
A fully automated, user-independent method is described for computer-mediated interpretation of data derived by mass spectrometry of an experimental peptide to identify and characterize a corresponding peptide sequence in a peptide database. The method identifies the corresponding sequence if it is present in the database, without the need for a skilled observer to choose from amongst a list of possible matches. By using an automated back-read process, the present method can uniquely identify a corresponding peptide sequence in a database based on a single matching peptide sequence. The method also permits mapping of mass spectral data to sequences in peptide or nucleotide databases for unambiguous identification of exons; determining a correct reading frame; identifying artefacts and errors in sequences; identifying mutations and polymorphisms; identifying post-translational modifications; and identifying exon-intron boundaries.
The invention relates to orthogonal pairs of tRNAs and aminoacyl-tRNA synthetases that can incorporate the coumarin unnatural amino acid L-(7-hydroxycoumarin-4-yl)ethylglycine into proteins produced in eubacterial host cells such as
E. coli
. The invention provides, for example but not limited to, novel orthogonal synthetases, methods for identifying and making the novel synthetases, methods for producing proteins containing the unnatural amino acid L-(7-hydroxycoumarin-4-yl)ethylglycine and related translation systems.
The invention relates to orthogonal pairs of tRNAs and aminoacyl-tRNA synthetases that can incorporate the coumarin unnatural amino acid L-(7-hydroxycoumarin-4-yl)ethylglycine into proteins produced in eubacterial host cells such as
E. coli
. The invention provides, for example but not limited to, novel orthogonal synthetases, methods for identifying and making the novel synthetases, methods for producing proteins containing the unnatural amino acid L-(7-hydroxycoumarin-4-yl)ethylglycine and related translation systems.