Fe(II) phthalocyanine catalyzed oxidation of dGMP by molecular oxygen
作者:Aleksandra A. Kuznetsova、Lyudmila I. Solovyeva、Oleg L. Kaliya、Evgeniy A. Lukyanets、Dmitri G. Knorre、Olga S. Fedorova
DOI:10.1016/j.bmcl.2009.05.088
日期:2009.8
We show that iron(II)-phthalocyanines are able to catalyze guanosine oxidation by molecularoxygen in the presence of reducing agents such as ascorbic acid and 2-mercaptoethanol. The products of 5′-monophosphate-2′-deoxyguanosine (dGMP) oxidation were directly analyzed using the HPLC-ESI/MS method. The main oxidation products were 5′-phospho-2′-deoxy-8-oxo-7,8-dihydroguanine and the 1,N2-glyoxal adduct
[EN] PYRIMIDINE DERIVATIVES FOR USE IN THE TREATMENT OF CANCER<br/>[FR] DÉRIVÉS DE PYRIMIDINE UTILISÉS DANS LE TRAITEMENT DU CANCER
申请人:MERCK PATENT GMBH
公开号:WO2016128140A1
公开(公告)日:2016-08-18
Compounds of Formula I or II in which R1, X1 and X2 have the meanings indicated in claim 1, are MTH1 inhibitors and can be employed, inter alia, in the treatment of cancer.
(37-fold), suggesting that Asn-119 functioned both as a hydrogenbond donor to C8O, and a hydrogenbond acceptor from N7H of 8-oxo-dGMP, while aspartate at position −119 functioned as an acceptor of a single hydrogenbond. Much smaller weakening effects (0.3–0.4 kcal/mol) on the binding of dGMP and dAMP were found, indicating specific hydrogenbonding of Asn-119 to 8-oxo-dGMP. While formation of the wild
There is described an apparatus for measuring protein characteristics comprising an X-ray fluorescence (XRF) spectrometer comprising a source of polychromatic X-rays, an X-ray detector, a protein, a molecule that has been exposed to and at least weakly binds to the protein, a plurality of X-ray fluorescence signal data obtained by irradiating chemical elements in the protein and molecule with the polychromatic X-rays and a security system for maintaining records for the data from the plurality of X-ray fluorescence signal measurements. There is also described an x-ray microscope for measuring a sample.
描述了一种测量蛋白质特性的仪器,该仪器包括一个 X 射线荧光 (XRF) 光谱仪,其中包括一个多色 X 射线源、一个 X 射线探测器、一个蛋白质、一个已暴露于该蛋白质并至少与该蛋白质弱结合的分子、通过用多色 X 射线照射蛋白质和分子中的化学元素而获得的多个 X 射线荧光信号数据,以及一个用于维护多个 X 射线荧光信号测量数据记录的安全系统。此外,还介绍了一种用于测量样品的 X 射线显微镜。
Induction of 8-oxo-dGTPase activity in human lymphoid cells and normal fibroblasts by oxidative stress
作者:Frauke Meyer、Emerich Fiala、Johannes Westendorf
DOI:10.1016/s0300-483x(00)00140-2
日期:2000.5
The pre-mutagen 8-Oxo-2'-deoxyguanosine-5'-triphosphate (8-oxo-dGTP) is formed during normal cellular metabolism and its incorporation into DNA leads to transversion mutations. Human cells possess the hMTH-1 gene encoding the enzyme 8-oxo-dGTPase, which catalyzes the hydrolysis of 8-oxo-dGTP to the corresponding 8-oxo-dGMP, preventing mutations. To elucidate the involvement of 8-oxo-dGTPase in carcinogenesis, we studied hMTH-1 gene expression and enzyme activity in response to oxidative stress to human skin fibroblasts and Jurkat cells. In fibroblasts, ranges from 0 to 100 mu M H2O2 caused a 2-fold induction of hMTH-1-mRNA expression and a 3-fold induction of enzyme activity. A 1.7-fold induction of mRNA expression and a 3.5-fold induction of enzyme activity was obtained in Jurkat cells after treatment ranging from 0 to 300 mu M H2O2. Cytotoxic concentrations of hydrogen peroxide lead to an almost complete loss of enzyme activity and an inhibition of hMTH-1 mRNA expression. Induction of hMTH-1 gene expression was prevented by addition of actinomycin D and cycloheximide. These data indicate the inducibility of the hMTH-1 gene expression and enzyme activity by prooxidative molecules, such,Is hydrogen peroxide. These parameters can thus be used as a marker of oxidative stress. (C) 2000 Elsevier Science Ireland Ltd. All rights reserved.