芽孢杆菌硫醇是革兰氏阳性菌中主要的低分子量硫醇,包括人类病原体金黄色葡萄球菌。bacillithiol被认为是抵抗免疫系统产生的氧化剂的重要防御机制,尤其是源自髓过氧化物酶的次氯酸(HOCl)。但是,尚不清楚BSH与HOCl反应的速度如何以及在反应中形成了什么产物。在本研究中,我们使用了基于MRM的灵敏的LC-MS方法来表征无细胞溶液和金黄色葡萄球菌中BSH与HOCl的反应。在无细胞系统中,BSH主要以低摩尔比的HOCl和较高氧化剂浓度的亚磺酸和磺酸形成二硫键二聚体(BSSB)。HOCl也促进了杆菌硫醇磺酰胺的形成。在金黄色葡萄球菌的氧化模式相似,除了一小部分的BSH还会与蛋白质硫醇形成混合的二硫化物。 利用与蛋氨酸的竞争,我们确定HOCl与BSH反应的二级速率常数为6×10 7 M -1 s -1,这表明反应是快速的,接近扩散控制的反应。其他反应性卤素物质,包括次硫氰酸(HOSCN),
Synthesis of Bacillithiol and the Catalytic Selectivity of FosB-Type Fosfomycin Resistance Proteins
摘要:
Bacillithiol (BSH) has been prepared on the gram scale from the inexpensive starting material, D-glucosamine hydrochloride, in 11 steps and 8-9% overall yield. The BSH was used to survey the substrate and metal-ion selectivity of FosB enzymes from four Gram-positive microorganisms associated with the deactivation of the antibiotic fosfomycin. The in vitro results indicate that the preferred thiol substrate and metal ion for the FosB from Staphylococcus aureus are BSH and Ni(II), respectively. However, the metal-ion selectivity is less distinct with FosB from Bacillus subtilis, Bacillus anthracis, or Bacillus cereus.
Sulfinamide Formation from the Reaction of Bacillithiol and Nitroxyl
作者:Alberto Negrellos、Allison M. Rice、Patricia C. Dos Santos、S. Bruce King
DOI:10.1021/acschembio.3c00526
日期:2023.12.15
and exposed it to nitroxyl (HNO), a reactive nitrogen species that influences bacterial sulfur metabolism. The profile of this reaction was distinct from HNO oxidation of GSH, which yielded mixtures of disulfide and sulfinamide. The reaction of BSH and HNO (generated from Angeli’s salt) gives only sulfinamide products, including a newly proposed cyclic sulfinamide. Treatment of a glucosamine–cysteine
Oxidation of bacillithiol by myeloperoxidase-derived oxidants
作者:Nina Dickerhof、Louise Paton、Anthony J. Kettle
DOI:10.1016/j.freeradbiomed.2020.06.009
日期:2020.10
Bacillithiol is a major low-molecular-weight thiol in gram-positive firmicutes including the human pathogen Staphylococcus aureus. Bacillithiol is regarded as an important defence mechanism against oxidants produced by the immune system, especially myeloperoxidase-derived hypochlorous acid (HOCl). However, it is unknown how fast BSH reacts with HOCl and what products are formed in the reaction. In the
芽孢杆菌硫醇是革兰氏阳性菌中主要的低分子量硫醇,包括人类病原体金黄色葡萄球菌。bacillithiol被认为是抵抗免疫系统产生的氧化剂的重要防御机制,尤其是源自髓过氧化物酶的次氯酸(HOCl)。但是,尚不清楚BSH与HOCl反应的速度如何以及在反应中形成了什么产物。在本研究中,我们使用了基于MRM的灵敏的LC-MS方法来表征无细胞溶液和金黄色葡萄球菌中BSH与HOCl的反应。在无细胞系统中,BSH主要以低摩尔比的HOCl和较高氧化剂浓度的亚磺酸和磺酸形成二硫键二聚体(BSSB)。HOCl也促进了杆菌硫醇磺酰胺的形成。在金黄色葡萄球菌的氧化模式相似,除了一小部分的BSH还会与蛋白质硫醇形成混合的二硫化物。 利用与蛋氨酸的竞争,我们确定HOCl与BSH反应的二级速率常数为6×10 7 M -1 s -1,这表明反应是快速的,接近扩散控制的反应。其他反应性卤素物质,包括次硫氰酸(HOSCN),
Synthesis of Bacillithiol and the Catalytic Selectivity of FosB-Type Fosfomycin Resistance Proteins
作者:Alexander P. Lamers、Mary E. Keithly、Kwangho Kim、Paul D. Cook、Donald F. Stec、Kelly M. Hines、Gary A. Sulikowski、Richard N. Armstrong
DOI:10.1021/ol302327t
日期:2012.10.19
Bacillithiol (BSH) has been prepared on the gram scale from the inexpensive starting material, D-glucosamine hydrochloride, in 11 steps and 8-9% overall yield. The BSH was used to survey the substrate and metal-ion selectivity of FosB enzymes from four Gram-positive microorganisms associated with the deactivation of the antibiotic fosfomycin. The in vitro results indicate that the preferred thiol substrate and metal ion for the FosB from Staphylococcus aureus are BSH and Ni(II), respectively. However, the metal-ion selectivity is less distinct with FosB from Bacillus subtilis, Bacillus anthracis, or Bacillus cereus.