(GSH) to form MeHgCys and MeHgSG complexes. Herein, it is reported that the N,N‐disubstituted benzimidazole‐based thione 1 containing a N−CH2CH2OH substituent converts MeHgCys and MeHgSG complexes to less toxic water‐soluble HgS nanoparticles (NPs) and releases the corresponding free thiols CysH and GSH from MeHgCys and MeHgSG, respectively, in solution by unusual ligand‐exchange reactions in phosphate
Uptake Kinetics of Methylmercury in a Freshwater Alga Exposed to Methylmercury Complexes with Environmentally Relevant Thiols
作者:Aleksandra Skrobonja、Zivan Gojkovic、Anne L. Soerensen、Per-Olof Westlund、Christiane Funk、Erik Björn
DOI:10.1021/acs.est.9b05164
日期:2019.12.3
environment. Rate constants for MeHg interactions with cells were determined for the MeHg-thiol treatments and a control assay containing the thermodynamically less stable MeHgOH complex. We found both elevated amounts of MeHg associated with whole cells and higher MeHg association rate constants in the control compared to the thiol treatments. Furthermore, the association rate constants were lower when
Hg–C bond protonolysis by a functional model of bacterial enzyme organomercurial lyase MerB
作者:Ramesh Karri、Ranajit Das、Rakesh Kumar Rai、Anaswara Gopalakrishnan、Gouriprasanna Roy
DOI:10.1039/d0cc02232b
日期:——
Herein, we report a novel synthetic compound 1, having a highly nucleophilic selenolate (Se−) moiety and a thiol (–SH) functional group, which showed efficient Hg–C bond protonolysis of various R–Hg–X molecules including neurotoxic methylmercury and thimerosal, via direct –SH proton transfer to the highly activated C-atom of a departed R group with low activation energy barrier at room temperature
Cleavage of Hg–C Bonds of Organomercurials Induced by Im<sup>OH</sup>Se via Two Distinct Pathways
作者:Mainak Banerjee、Gouriprasanna Roy
DOI:10.1021/acs.inorgchem.7b01301
日期:2017.11.6
the remarkable ability to degrade methylmercury by two distinct pathways. Under basic conditions, ImOHSe converts MeHgCl into biologically inert HgSe nanoparticles and Me2Hg via the formation of an unstable intermediate (MeHg)2Se (pathway I). However, under neutral conditions, in the absence of any base, ImOHSe facilitates the cleavage of the Hg–C bond of MeHgCl at room temperature (23 °C), leading
我们显示具有N–CH 2 CH 2 OH取代基的基于N-甲基咪唑的selone Im OH Se具有通过两种不同的途径降解甲基汞的显着能力。在碱性条件下,Im OH Se通过形成不稳定的中间体(MeHg)2 Se来将MeHgCl转化为生物惰性的HgSe纳米颗粒和Me 2 Hg (途径I)。但是,在中性条件下,在没有任何碱的情况下,Im OH Se促进了室温下(23°C)MeHgCl的Hg–C键的裂解,导致形成稳定的裂解产物,即四配位单核汞化合物(Im OH Se)2HgCl 2和Me 2 Hg(途径II)。Im OH Se诱导的MeHgCl的Hg–C键断裂的初始速率几乎比Im Me Se观察到的初始速率高2倍。此外,我们表明,Im Y Se(Y = OH,Me)在室温下具有出色的使Me 2 Hg脱烷基化的能力。在酸性条件下,在过量的Im Y Se的存在下,挥发性和有毒的Me 2 Hg进一步分解为四配位单核汞化合物[(Im