676556-11-9Relevant academic research and scientific papers
4-Thio-5-bromo-2′-deoxyuridine: Chemical synthesis and therapeutic potential of UVA-induced DNA damage
Xu, Yao-Zhong,Zhang, Xiaohui,Wu, Hai-Chen,Massey, Andrew,Karran, Peter
, p. 995 - 997 (2004)
4-Thio-5-bromo-2′-deoxyuridine (3a) is prepared from 5-bromo-2′-deoxyuridine (BrdU) and its key properties are explored. The thionucleoside (3a) can react readily with monobromobimane and produces high fluorescence. 3a has UV maximum absorption at 340 nm and can be incorporated into cellular DNA. The cells containing 3a become sensitive to UVA light, offering therapeutic potential for UVA-induced cell killing.
NMR and UV studies of 4-thio-2′-deoxyuridine and its derivatives
Zhang, Xiaohui,Xu, Yao-Zhong
, p. 5655 - 5664 (2011)
5-Substituted-4-thio-2'-deoxyuridine nucleosides have been chemically synthesized and studied by NMR and UV spectroscopy. The results have been analyzed and discussed in connection with the previous data. The imino proton signal and the carbon signal of the thiocarbonyl group in the 5-substituted-4-thio-2'-deoxyuridines were found to be at much lower field, offering a potential for monitoring these modified bases at the DNA level. All 4-thionucleosides have strong absorptions at around 340 nm and consequently would be useful as potential UVA-induced anticancer agents.
Why does the type of halogen atom matter for the radiosensitizing properties of 5-halogen substituted 4-thio-20-deoxyuridines?
Spisz, Paulina,Zdrowowicz, Magdalena,Makurat, Samanta,Kozak, Witold,Skotnicki, Konrad,Bobrowski, Krzysztof,Rak, Janusz
, (2019/08/08)
Radiosensitizing properties of substituted uridines are of great importance for radiotherapy. Very recently, we confirmed 5-iodo-4-thio-20-deoxyuridine (ISdU) as an efficient agent, increasing the extent of tumor cell killing with ionizing radiation. To our surprise, a similar derivative of 4-thio-2’-deoxyuridine, 5-bromo-4-thio-20-deoxyuridine (BrSdU), does not show radiosensitizing properties at all. In order to explain this remarkable difference, we carried out a radiolytic (stationary and pulse) and quantum chemical studies, which allowed the pathways to all radioproducts to be rationalized. In contrast to ISdU solutions, where radiolysis leads to 4-thio-2’-deoxyuridine and its dimer, no dissociative electron attachment (DEA) products were observed for BrSdU. This observation seems to explain the lack of radiosensitizing properties of BrSdU since the efficient formation of the uridine-5-yl radical, induced by electron attachment to the modified nucleoside, is suggested to be an indispensable attribute of radiosensitizing uridines. A larger activation barrier for DEA in BrSdU, as compared to ISdU, is probably responsible for the closure of DEA channel in the former system. Indeed, besides DEA, the XSdU anions may undergo competitive protonation, which makes the release of X? kinetically forbidden.
Systematic assignment of NMR spectra of 5-substituted-4-thiopyrimidine nucleosides
Zhang, Xiaohui,Wang, Jian,Xu, Yao-Zhong
, p. 523 - 529 (2013/09/02)
Unambiguous characterization of 5-substituted-4-thiopyrimidine nucleosides (ribonucleosides and 2'-deoxynucleosides) was performed using NMR spectroscopy. Assignments of all proton and carbon signals of 5-bromo-4-thiouridine and related nucleosides were systematically carried out and firmly established by COSY and HMQC techniques. The NMR data of various 4-thiopyrimidine nucleosides are compared, and the key contributing factors discussed. The approach presented here is applicable to other modified nucleosides and nucleotides, as well as nucleobases. Copyright
