The development of a new class of inhibitors for betaine-homocysteine S-methyltransferase
摘要:
Betaine-homocysteine S-methyltransferase (BHMT) is an important zinc-dependent methyltransferase that uses betaine as the methyl donor for the remethylation of homocysteine to form methionine. In the liver, BHMT performs to half of the homocysteine remethylation. In this study, we systematically investigated the tolerance of the enzyme for modifications at the "homocysteine" part of the previously reported potent inhibitor (R,S)-5-(3-amino-3-carboxy-propylsulfanyl)-pentanoic acid (1). In the new compounds, which are S-alkylated homocysteine derivatives, we replaced the carboxylic group in the "homocysteine" part of inhibitor 1 with different isosteric moieties (tetrazole and oxadiazolone); we suppressed the carboxylic negative charge by amidations; we enhanced acidity by replacing the carboxylate with phosphonic or phosphinic acids; and we introduced pyrrolidine steric constraints. Some of these compounds display high affinity toward human BHMT and may be useful for further pharmacological studies of this enzyme. Although none of the new compounds were more potent inhibitors than the reference inhibitor 1, this study helped to completely define the structural requirements of the active site of BHMT and revealed the remarkable selectivity of the enzyme for homocysteine. (C) 2013 Elsevier Masson SAS. All rights reserved.
The invention relates to compounds having either agonist or antagonist activities for the neurotrophins NGF and BDNF and represented by monomeric or dimeric substituted dipeptides that are analogs of the exposed portions of loop 1 or loop 4 regions of these neurotrophins near or at a beta-turn of the respective loop. N-acylated substituents of these dipeptides are biostereoisomers of the amino acid residues preceding these dipeptide sequences in the neurotrophin primary structure. The dimeric structure is produced advantageously by using hexamethylenediamine to which dipeptides are attached via their carboxyl groups. The claimed compounds displayed neuroprotective and differentiation-inducing activities in cellular models and enhanced the amount of phosphorylated tyrosine kinase A and the heat shock proteins Hsp32 and Hsp70 in the concentration range of 10
−9
to 10
−5
M. They also displayed neuroprotective, anti-parkinsonian, anti-stroke, anti-ischemic, anti-depressant and anti-amnestic activities in animal models and were active in experimental models of Alzheimer's disease. These in vivo effects of the claimed compounds are displayed in the dose range of 0.01 to 10 mg/kg when administered intraperitoneally.
Solid-state linear polarized IR-spectroscopic and theoretical analysis of methioninamide ester amide of squaric acid diethyl ester
作者:Emiliya Cherneva、Tsonko Kolev
DOI:10.1016/j.molstruc.2006.06.009
日期:2007.3
Methioninamide ester amide of squaric acid (1) has been analyzed structurally and IR-spectroscopically by means of ab initio calculations and solid-state linear-polarized IR-spectroscopy (IR-LD) of oriented solid-samples as suspension in nematic liquid crystal. The obtained data are compared with known single crystal X-ray diffraction ones. The experimental IR-spectroscopic bands assignment in solid-state
方酸的甲硫氨酰胺酯酰胺 (1) 已通过从头计算和固态线性偏振红外光谱 (IR-LD) 对作为向列液晶悬浮液的定向固体样品进行结构和红外光谱分析。将获得的数据与已知的单晶 X 射线衍射数据进行比较。还报告了固态中的实验红外光谱带分配,使用减差程序进行偏振红外光谱解释。
Preparation and use of methionylmethionine as feed additive for fish and crustaceans
申请人:Kobler Christoph
公开号:US09095161B2
公开(公告)日:2015-08-04
An animal feed mixture containing DL-methionyl-DL-methionine and salts thereof for animals kept in aquacultures is provided. Methods for preparing DL-methionyl-DL-methionine of formula (I)
and methods to fractionate the diasteriomeric forms obtained are also provided.
The present invention relates to a method for producing a specified α-amino acid, the method including allowing a specified α-amino acid amide and water to react with each other in the presence of a zirconium compound which contains zirconium and at least one metal element selected from the group consisting of lithium, nickel, copper, zinc, cesium, barium, hafnium, tantalum, cerium, and dysprosium.
[DE] SUBSTITUIERTE 1,4,8-TRIAZASPIRO[4.5]DECAN-2-ON-VERBINDUNGEN<br/>[EN] SUBSTITUTED 1,4,8-TRIAZASPIRO[4.5]DECAN-2-ONE COMPOUNDS<br/>[FR] COMPOSES DE 1,4,8-TRIAZASPIRO[4.5]DECAN-2-ONE SUBSTITUES
申请人:GRUENENTHAL GMBH
公开号:WO2005095398A1
公开(公告)日:2005-10-13
Die vorliegende Erfindung betrifft substituierte 1,4,8,-Triazaspiro[4.5]decan-2-on-Verbindungen, Verfahren zu deren Herstellung, Arzneimittel enthaltend diese Verbindung sowie die Verwendung dieser Verbindungen zur Herstellung von Arzneimitteln.