Differences in the efficiency of 3-deazathiamine and oxythiamine pyrophosphates as inhibitors of pyruvate dehydrogenase complex and growth of HeLa cells <i>in vitro</i>
Abstract Oxythiamine (OT) and 3-deazathiamine (DAT) are the antimetabolites of thiamine. The aim of study was to compare the effects of OT and DAT pyrophosphates (-PP) on the kinetics of mammalian pyruvate dehydrogenase complex (PDHC) and the in vitro culture of HeLa cells. The kinetic study showed that 3-deazathiamine pyrophosphate (DATPP) was a much stronger competitive inhibitor (Ki = 0.0026 μM)
摘要 氧胺(OT)和3-脱氮硫胺(DAT)是硫胺的抗代谢物。研究的目的是比较OT和DAT焦磷酸盐(-PP)对哺乳动物丙酮酸脱氢酶复合物(PDHC)动力学和HeLa细胞体外培养的影响。动力学研究表明,3-脱氮杂胺焦磷酸(DATPP)是PDHC的竞争性抑制剂(K i = 0.0026μM)比OTPP(K i = 0.025μM)强得多。两个K i 值都比K m低得多硫胺素焦磷酸(0.06μM)。但是,在HeLa细胞培养的培养基中添加DATPP不会影响细胞的生长速度,并且对细胞的活力没有显着影响,而OTPP和OT则显示出显着的细胞抑制作用。硫胺素类抗维生素在体外对细胞生长的影响上的差异可能是由于理化性质的差异以及DAT跨细胞膜转运的困难。
Structure-Based Design of Potent Small-Molecule Binders to the S-Component of the ECF Transporter for Thiamine
作者:Lotteke J. Y. M. Swier、Leticia Monjas、Albert Guskov、Alrik R. de Voogd、Guus B. Erkens、Dirk J. Slotboom、Anna K. H. Hirsch
DOI:10.1002/cbic.201402673
日期:2015.3.23
ThiT's tough: Thiamine derivatives capable of interacting with ThiT, the S‐component of the thiamine‐specific ECFtransporter, have been designed and synthesized. The binding affinities and co‐crystal structures have been determined.
作者:Daniel Hawksley、David A. Griffin、Finian J. Leeper
DOI:10.1039/b006962k
日期:——
An efficient ten-step synthesis of deazathiamine is described. The synthesis starts from commercially available α-acetyl-γ-butyrolactone and proceeds via deamination of the key aminothiophene 6. The Gewald synthesis of thiophenes is shown to give a mixture of isomeric products with the unsymmetric ketone used here and so a modified procedure giving a single isomer is developed.
Non-charged thiamine analogs as inhibitors of enzyme transketolase
作者:Allen A. Thomas、J. De Meese、Y. Le Huerou、Steven A. Boyd、Todd T. Romoff、Steven S. Gonzales、Indrani Gunawardana、Tomas Kaplan、Francis Sullivan、Kevin Condroski、Joseph P. Lyssikatos、Thomas D. Aicher、Josh Ballard、Bryan Bernat、Walter DeWolf、May Han、Christine Lemieux、Darin Smith、Solly Weiler、S. Kirk Wright、Guy Vigers、Barb Brandhuber
DOI:10.1016/j.bmcl.2007.11.098
日期:2008.1
Inhibition of the thiamine-utilizing enzyme transketolase (TK) has been linked with diminished tumor cell proliferation. Most thiamine antagonists have a permanent positive charge on the B-ring, and it has been suggested that this charge is required for diphosphorylation by thiamine pyrophosphokinase (TPPK) and binding to TK. We sought to make neutral thiazolium replacements that would be substrates for TPPK, while not necessarily needing thiamine transporters (ThTr1 and ThTr2) for cell penetration. The synthesis, SAR, and structure-based rationale for highly potent non-thiazolium TK antagonists are presented. (c) 2007 Elsevier Ltd. All rights reserved.
A protecting group-free synthesis of deazathiamine: A step toward inhibitor design
作者:Hong Zhao、Luiz Pedro S. de Carvalho、Carl Nathan、Ouathek Ouerfelli
DOI:10.1016/j.bmcl.2010.09.053
日期:2010.11
The discovery of 3-deazathiamine diphosphate (deazaThDP) as a potent inhibitor analog of the cofactor thiamine diphosphate (ThDP) has highlighted the need for an efficient and scalable synthesis of deazaThDP. Such a method would facilitate development of analogs with the ability to inhibit individual ThDP-dependent enzymes selectively. Toward the goal of developing selective inhibitors of the mycobacterial enzyme 2-hydroxy-3-oxoadipate synthase (HOAS), we report an improved synthesis of deazaThDP without use of protecting groups. Tribromo-3-methylthiophene served as a versatile starting material whose selective functionalization permitted access to deazaThDP in five steps, with potential to make other analogs accessible in substantial amounts. (C) 2010 Elsevier Ltd. All rights reserved.