Novel NADPH–cysteine covalent adduct found in the active site of an aldehyde dehydrogenase
作者:Ángel G. Díaz-Sánchez、Lilian González-Segura、Enrique Rudiño-Piñera、Alfonso Lira-Rocha、Alfredo Torres-Larios、Rosario A. Muñoz-Clares
DOI:10.1042/bj20110376
日期:2011.11.1
molecule hydrogen bonded to the carboxamide group. Reversibleformation of NAD(P)H-Cys286 adducts in solution causes reversible enzyme inactivation as well as the loss of Cys286 reactivity towards thiol-specific reagents. This novel covalent modification may provide a physiologically relevant regulatory mechanism of the irreversible PaBADH-catalysed reaction, preventing deleterious decreases in the intracellular
PaBADH(铜绿假单胞菌甜菜碱醛脱氢酶)催化不可逆的NAD(P)+依赖性甜菜碱醛氧化成其相应的酸,即渗透保护剂甘氨酸甜菜碱。该反应涉及胆碱的分解代谢以及该重要病原体对在感染部位普遍存在的渗透和氧化应激的反应。PaBADH与NADPH的复合物的晶体结构显示吡啶环的C2N与半胱氨酸催化残基Cys286的硫原子之间存在新的共价加合物。以前没有关于半胱氨酸残基或低分子质量硫醇的报道。半胱氨酸硫醇盐在“静止”构象上的迈克尔加成与α的双键,β-不饱和烟酰胺可通过PaBADH活性位点中NADPH的特定构象(也在Cys286Ala突变体的晶体结构中观察到)和与羧酰胺基团结合的有序水分子来促进。溶液中NAD(P)H-Cys286加合物的可逆形成导致可逆酶失活以及Cys286对硫醇特异性试剂的反应性丧失。这种新的共价修饰可以提供不可逆的PaBADH催化反应的生理相关调节机制,防止细胞内NAD(P)+ / N
Optically active salts of a substituted thiazolidine-4-carboxylate and
申请人:Degussa Aktiengesellschaft
公开号:US05191085A1
公开(公告)日:1993-03-02
Optically active salts are disclosed of the formula (I): ##STR1## wherein Ac represents an acyl group, R.sup.1 hydrogen or methyl, R.sup.2 and R.sup.3 identical or different substitutes, preferably methyl. The salts can be obtained from the corresponding optically active carbonic acid and DL-3-cyano-2-hydroxypropyl trimethylammonium hydroxide. The diastereomeric salt pairs are easily split from one another and separated again, so that the process is suited for producing optically active 3-cyano-2-hydroxypropyl trimethylammonium salts.
Pyridazinium compounds and a process for their production
申请人:BASF Aktiengesellschaft
公开号:US04011220A1
公开(公告)日:1977-03-08
New pyridazinium compounds which can be used as intermediates and are of interest because of their pharmacological properties, and their production.
新的吡啶杂环化合物可用作中间体,并因其药理学特性而受到关注,以及它们的生产。
2-(Amino or substituted amino)-5-(substituted oxymethyl)-phenol compounds, dyeing compositions containing them, and use thereof
申请人:Lim Muill
公开号:US20050005370A1
公开(公告)日:2005-01-13
Disclosed are 2-(amino or substituted amino)-5-(substituted oxymethyl)-phenol compounds according to the Formula (I), as defined herein. Also, compositions for the oxidative dyeing of keratin fibers, comprising a medium suitable for dyeing and a compound of the Formula (II), as defined herein. The substituents of both formulae may themselves be substituted or unsubstituted. Further, methods for oxidative dyeing of keratin fibers, comprising applying such compositions in the presence of an oxidizing agent, for a period which is sufficient to develop the desired coloration.
DNA encoding rat taurine transporter and uses thereof
申请人:Synaptic Pharmaceutical Corporation
公开号:US05658786A1
公开(公告)日:1997-08-19
This invention provides isolated nucleic acid molecules encoding two mammalian GABA transporters, a mammalian taurine transporter and two human GABA transporters and methods of isolating these nucleic acid molecules. Further provided are vectors comprising the nucleic acid molecules as well as mammalian cells comprising such vectors, and antibodies directed to the GABA and taurine transporters. Nucleic acid probes useful for detecting nucleic acid molecules encoding GABA and taurine transporters are also provided. Antisense oligonucleotides complementary to any sequences of a nucleic acid molecule which encodes a GABA or taurine transporter are further provided. Pharmaceutical compounds related to GABA and taurine transporters are provided. Nonhuman transgenic animals which express DNA encoding a normal or a mutant GABA or taurine transporter are also provided. Further provided are methods for determining substrate binding, detecting expression, drug screening, and treatments for alleviating abnormalities associated with GABA and taurine transporters.