Reducing Holomycin Thiosulfonate to its Disulfide with Thiols
作者:Andrew N. Chan、Walter J. Wever、Elisabetta Massolo、Scott E. Allen、Bo Li
DOI:10.1021/acs.chemrestox.8b00243
日期:2019.3.18
studied the reactivity of the thiosulfonate derivative of the DTP holomycin, oxo-holomycin, and discovered a unique redox reaction: Oxo-holomycin is reduced to its parent disulfide, while oxidizing small molecule and protein thiols to disulfides. Our work reveals that the DTP core is a privileged scaffold that undergoes unusual redox chemistry. The redox chemistry of the DTP natural products may contribute
Expedient total synthesis of pyrrothine natural products and analogs
作者:Thomas Hjelmgaard、Michael Givskov、John Nielsen
DOI:10.1039/b616411k
日期:——
and straightforward totalsynthesis of the two pyrrothine natural products holomycin (7 steps, 11% overall) and xenorhabdin I (7 steps, 11% overall) and analogs thereof via a common late-stage intermediate. The pathway proceeds via the pyrrothine hydrochloride intermediate (6 steps, 17% overall) which also gave access to very fast synthesis of analogs as demonstrated by the synthesis of , and (7 steps
Inhibition of Isoleucyl-tRNA Synthetase by the Hybrid Antibiotic Thiomarinol
作者:Rachel A. Johnson、Andrew N. Chan、Ryan D. Ward、Caylie A. McGlade、Breanne M. Hatfield、Jason M. Peters、Bo Li
DOI:10.1021/jacs.1c02622
日期:2021.8.11
provide evidence to support a dual mode of action for thiomarinol A that may include both IleRS inhibition and metal chelation. We demonstrate that MRSA develops resistance to thiomarinol A to a substantially lesser degree than mupirocin and the potent activity of thiomarinol A requires hybridity between DTP and mupirocin. Our findings identify a mode of action of a natural hybrid antibiotic and demonstrate
混合抗生素是克服抗生素耐药性的新兴抗菌策略。天然产物 thiomarinol A 是两种抗生素的混合物:holothin,一种二硫代吡咯酮 (DTP) 和 marinolic 酸,一种用于治疗耐甲氧西林金黄色葡萄球菌(MRSA) 的药物莫匹罗星的密切类似物。DTP 通过螯合细胞中的金属离子来破坏金属稳态,而莫匹罗星则靶向必需的酶异亮氨酰-tRNA 合成酶 (IleRS)。Thiomarinol A 对莫匹罗星敏感的 MRSA 的效力是莫匹罗星的 100 倍以上;然而,它的作用方式一直未知。我们显示 thiomarinol A 靶向 IleRS。IleRS 编码基因ileS的敲除,在化学基因组学筛选中表现出对 thiomarinol A 的合成类似物的敏感性。Thiomarinol A 以皮摩尔K i抑制 MRSA IleRS并以低飞摩尔亲和力与 IleRS 结合,比莫匹罗星紧密 1600 倍。我们发现
Thiomarinol, a new hybrid antimicrobial antibiotic produced by a marine bacterium. Fermentation, isolation, structure, and antimicrobial activity.
antibiotic, was isolated from the culturebroth of a marine bacterium, Alteromonas rava sp. nov. SANK 73390. Its structure was deduced as a hybrid composed of a pseudomonic acidanalogue and holothin by NMR spectral analysis and chemical degradation. Antimicrobial activity against Gram-positive and Gram-negative bacteria of thiomarinol was stronger than both of pseudomonic acids and pyrrothine antibiotics
Identification of the gene cluster for the dithiolopyrrolone antibiotic holomycin in
<i>Streptomyces clavuligerus</i>
作者:Bo Li、Christopher T. Walsh
DOI:10.1073/pnas.1014140107
日期:2010.11.16
producer of clavulanate as well as cephem antibiotics, also produces the N-acylated dithiolopyrrolone antibiotic holomycin, a reported inhibitor of RNA synthesis. The genome sequence of S. clavuligerus ATCC 27064 was examined for a potential biosynthetic gene cluster, assuming that holomycin arises from some derivative of an L-Cys-L-Cys dipeptide that has undergone eight-electron oxidation, fused five-five