Inhibition of thiamin diphosphate dependent enzymes by 3-deazathiamin diphosphate
作者:St�phane Mann、Concepcion Perez Melero、Dan Hawksley、Finian J. Leeper
DOI:10.1039/b403619k
日期:——
3-Deazathiamin diphosphate (deazaTPP) and a second thiamin diphosphate (TPP) analogue having a benzene ring in place of the thiazolium ring have been synthesised. These compounds are both extremely potent inhibitors of pyruvate decarboxylase from Zymomonas mobilis; binding is competitive with TPP and is essentially irreversible even though no covalent linkage is formed. DeazaTPP binds approximately seven-fold faster than TPP and at least 25,000-fold more tightly (Ki less than 14 pM). DeazaTPP is also a potent inhibitor of the E1 subunit of α-ketoglutarate dehydrogenase from E. coli and binds more than 70-fold faster than TPP. In this case slow reversal of the inhibition could be observed and a Ki value of about 5 nM was calculated (ca. 500-fold tighter binding than TPP).
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.
Insight into the complete substrate-binding pocket of ThiT by chemical and genetic mutations
作者:L. J. Y. M. Swier、L. Monjas、F. Reeßing、R. C. Oudshoorn、Aisyah Aisyah、T. Primke、M. M. Bakker、E. van Olst、T. Ritschel、I. Faustino、S. J. Marrink、A. K. H. Hirsch、D. J. Slotboom
DOI:10.1039/c7md00079k
日期:——
thiazolium ring of thiamine with residues Trp34, His125 and Glu84 by π–π-stacking and cation–π is studied, and second, the part of the binding pocket that extends from the hydroxyl group. We mutated either the transported ligand (chemically) or the protein (genetically). Surprisingly, modifications in the thiazolium ring by introducing substituents with opposite electroniceffects had similar effects on the
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.