摘要 研究了玉米芽细胞壁多胺氧化酶对乙酰多胺的氧化反应。纯化的酶在相同的最佳 pH 值 (6.5) 下催化 N 1 - 乙酰精胺、N 1 - 乙酰亚精胺和 N 8 - 乙酰亚精胺的氧化,但相对速度低于精胺和亚精胺氧化时发现的相对速度和 K m 。该酶在与精胺和亚精胺氧化相同的位置裂解 N 1 -乙酰精胺和 N 8 -乙酰亚精胺,产生 H 2 O 2 、1,3-二氨基丙烷和相应的氨基醛。多胺氧化酶在催化作用下迅速失活,N 1 -乙酰精胺衍生的氨基醛作为该酶的竞争性抑制剂(K i = 20 μM)。
The present invention provides a cobalamin-drug conjugate suitable for the treatment of tumor related diseases. Cobalamin is indirectly covalently bound to an anti-tumor drug via a cleavable linker and one or more optional spacers. Cobalamin is covalently bound to a first spacer or the cleavable linker via the 5′-OH of the cobalamin ribose ring. The drug is bound to a second spacer of the cleavable linker via an existing or added functional group on the drug. After administration, the conjugate forms a complex with transcobalamin (any of its isoforms). The complex then binds to a receptor on a cell membrane and is taken up into the cell. Once in the cell, an intracellular enzyme cleaves the conjugate thereby releasing the drug. Depending upon the structure of the conjugate, a particular class or type of intracellular enzyme affects the cleavage. Due to the high demand for cobalamin in growing cells, tumor cells typically take up a higher percentage of the conjugate than do normal non-growing cells. The conjugate of the invention advantageously provides a reduced systemic toxicity and enhanced efficacy as compared to a corresponding free drug.
A method of using synthetic L-SE-Methylselenocysteine as a nutriceutical and a method of its synthesis
申请人:PharmaSe, Incorporated
公开号:EP1205471A1
公开(公告)日:2002-05-15
A synthesis of and use of L-Se-methylselenocysteine as a nutriceutical is described, based upon the knowledge that L-Se-methylselenocysteine is less toxic than L-selenomethionine towards normal cells. The synthesis proceeds by mixing N-(tert-butoxycarbonyl)-L-serine with a dialkyl diazodicarboxylate and at least one of a trialkylphosphine, triarylphosphine and phosphite to form a first mixture that includes N-(tert-butoxycarbonyl)-L-serine β-lactone. Methyl selenol or its salt is mixed with the N-(tert-butoxycarbonyl)-L-serine β-lactone to form a second mixture that includes N-(tert-butoxycarbonyl)-Se-methylselenocysteine. The text butoxycarbonyl group is removed from the N-(tert-butoxycarbonyl)-Se-methylselenocysteine to form L-Se-methylselenocysteine. This synthesis significantly improves the manufacturability, manufacturing efficiency and utility of this naturally occurring rare form of organic-selenium. L-Se-methylselenocysteine formed, for example, in this manner may be used as a nutriceutical for supplementation into the diets of humans or animals for various beneficial purposes, such as, for example, to prevent or reduce the risk of developing cancer.
[EN] NOVEL INHIBITORS OF HISTONE DEACETYLASE 10<br/>[FR] NOUVEAUX INHIBITEURS DE L'HISTONE DÉSACÉTYLASE 10
申请人:DEUTSCHES KREBSFORSCH
公开号:WO2020193431A1
公开(公告)日:2020-10-01
The present invention relates to novel inhibitors of histone deacetylase 10 (HDAC10), novel pharmaceutical compositions comprising such inhibitors, and to novel methods of treating diseases, such as cancer, autoimmune disorders or neurodegeneration, using such novel inhibitors or methods of using such novel inhibitors in organ transplantation.
Unexpected Acetylation of Endogenous Aliphatic Amines by Arylamine
<i>N</i>
‐Acetyltransferase NAT2
作者:Louis P. Conway、Veronica Rendo、Mário S. P. Correia、Ingvar A. Bergdahl、Tobias Sjöblom、Daniel Globisch
DOI:10.1002/anie.202005915
日期:2020.8.17
play critical roles in the deactivation and clearance of xenobiotics, including clinical drugs. NAT2 has been classified as an arylamine N‐acetyltransferase that mainly converts aromatic amines, hydroxylamines, and hydrazines. Herein, we demonstrate that the human arylamine N‐acetyltransferase NAT2 also acetylates aliphatic endogenous amines. Metabolomic analysis and chemical synthesis revealed increased
The present invention relates to 2-substituted 4-heteroaryl-pyrimidines, their preparation, pharmaceutical compositions containing them and their use as inhibitors of cyclin-dependent kinases (CDKs) and hence their use in the treatment of proliferative disorders such as cancer, leukaemia, psoriasis and the like.