Platform to Discover Protease-Activated Antibiotics and Application to Siderophore–Antibiotic Conjugates
摘要:
Here we present a platform for discovery of protease-activated prodrugs and apply it to antibiotics that target Gram-negative bacteria. Because cleavable linkers for prodrugs had not been developed for bacterial proteases, we used substrate phage to discover substrates for proteases found in the bacterial periplasm. Rather than focusing on a single protease, we used a periplasmic extract of E. coli to find sequences with the greatest susceptibility to the endogenous mixture of periplasmic proteases. Using a fluorescence assay, candidate sequences were evaluated to identify substrates that release native amine-containing payloads. We next designed conjugates consisting of (1) an N-terminal siderophore to facilitate uptake, (2) a protease-cleavable linker, and (3) an amine-containing antibiotic. Using this strategy, we converted daptomycin-which by itself is active only against Gram-positive bacteria-into an antibiotic capable of targeting Gram-negative Acinetobacter species. We similarly demonstrated siderophore-facilitated delivery of oxazolidinone and macrolide antibiotics into a number of Gram-negative species. These results illustrate this platform's utility for development of protease-activated prodrugs, including Trojan horse antibiotics.
New COMT inhibitors for the treatment of depression and impaired cognition
申请人:Diederich Francois
公开号:US20050137162A1
公开(公告)日:2005-06-23
The present invention relates to compounds of formula I
wherein R
1
is as defined in the specification
and to esters thereof which are hydrolyzable under physiological conditions and to the pharmaceutically acceptable salts thereof. The compounds of the invention are inhibitors of COMT and, thus, are useful for the treatment of diseases for which COMT inhibition is beneficial. The invention further relates to the treatment, control, or prevention of diseases such as depression, schizophrenia, Parkinson's disease, and to improve cognition.
activity despite the lack of a NO2 substituent on the catechol moiety. Their synthesis takes advantage of a convergent approach, in which a series of functionalized catechol intermediates is prepared (Schemes 2–7) and coupled to a common adenosine-derived allylic amine building block (Scheme 8). Biological activities of the newly synthesized inhibitors, determined by in vitro enzymatic assay and kinetic
抑制儿茶酚O-甲基转移酶(COMT)代表了一种可行的策略,可调节儿茶酚胺神经递质或其前体的分解代谢,并且在帕金森氏病的治疗中引起了极大的兴趣。本文中,我们报道了由硝基取代的配体1(K i = 28 nM,表1)衍生的新一代有效的COMT双底物抑制剂的开发,尽管邻苯二酚上没有NO 2取代基,该抑制剂仍具有很高的生物活性。部分。它们的合成利用会聚方法的优势,其中制备了一系列功能化的邻苯二酚中间体(方案2–7))并偶联至常见的腺苷衍生的烯丙基胺结构单元(方案8)。通过体外酶促测定和动力学研究确定的新合成抑制剂的生物活性清楚地表明,双底物抑制剂的高抑制能力与邻苯二酚OH基团的p K a不相关。发现通过联芳基型连接与邻苯二酚连接的芳族残基最大程度地受益于与该酶的其他有利疏水相互作用,因此是1中NO 2基团的优选替代物。竞争性动力学抑制机制(图2)相对于所述辅因子结合位点被证实在所有情况下,支撑用于抑制剂双底物抑制模式2
Diphenyl-benzo[1,3]dioxole-4-carboxylic acid pentafluorophenyl ester: a convenient catechol precursor in the synthesis of siderophore vectors suitable for antibiotic Trojan horse strategies
作者:Etienne Baco、Françoise Hoegy、Isabelle J. Schalk、Gaëtan L. A. Mislin
DOI:10.1039/c3ob41990h
日期:——
Catechols are components of many metal-chelating compounds, including siderophores that are naturally occurring iron(III) chelators excreted by microorganisms. Catechol derivatives are poorly soluble in organic media and the synthesis of catechol-containing molecules requires the use of protected catechol precursors with improved organic solubility. We therefore developed 2,2-diphenyl-benzo[1,3]dioxole-4-carboxylic acid pentafluorophenyl ester. This activated ester reacts with an amine functionalized scaffold to generate chelators in which the catechol functions are protected in the form of diphenyl-benzodioxole moieties. The catechol can subsequently be deprotected, at the end of the synthesis, with trifluoroacetic acid (TFA). This strategy was applied to the synthesis of two catechol compounds functionalized with a terminal propargyl extension. These two compounds were shown to promote iron uptake in Escherichia coli and Pseudomonas aeruginosa. These two compounds are suitable for use as vectors in antibiotic Trojan horse approaches, as they could be conjugated with azide-functionalized antibiotics using the Huisgen dipolar 1,3-cycloaddition.
New polycyclic β-lactams. Synthesis of 2a,3-dihydroazeto[1,2-a]quinoline-1,4(2H)-diones, structural analogues of the carbacephalosporin antibiotics
作者:Mario D. Bachi、Joseph Klein
DOI:10.1039/p19830001925
日期:——
dihydroxydihydroazeto[1,2-a]quinoline-1,4(2H)-diones (1). The synthesis involved, as a key step, the completion of the polycyclic β-lactam system by a modified Bischler–Napieralski reaction. It was illustrated by the synthesis of (±)-7,8-dihydroxy-3,3-dimethyl-2-phenoxyacetamido-2a,3-dihydroazeto[1,2-a]quinoline-1,4(2H)-dione (20), which is structurally related to the carbacephalosporinantibiotics.
已经开发了一种制备二羟基二氢氮杂[1,2 - a ]喹啉-1,4(2H)-二酮(1)的方法。作为关键步骤,合成过程涉及通过修饰的Bischler-Napieralski反应完成多环β-内酰胺系统。通过(±)-7,8-二羟基-3,3-二甲基-2-苯氧基乙酰胺基-2a,3-二氢氮杂并[1,2 - a ]喹啉-1,4(2 H)-二酮的合成说明了这一点。(20),其在结构上与氨基头孢菌素抗生素有关。
Combinatorial design of multimeric chelating peptoids for selective metal coordination
作者:Abel Ricano、Ilya Captain、Korey P. Carter、Bryan P. Nell、Gauthier J.-P. Deblonde、Rebecca J. Abergel
DOI:10.1039/c9sc01068h
日期:——
catecholamide chelating units linked via an ethylenediamine bridge and, for comparison, we also synthesized the corresponding mixed ligands derived from the spermine scaffold: 3,4,3-LI(1,2-HOPO)2(CAM)2 and 3,4,3-LI(CAM)2(1,2-HOPO)2. Coordination-based luminescence studies were carried out with Eu3+ and Tb3+ to begin probing the properties of the new ligand architecture and revealed higher sensitization