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Silver/gold compounds and methods thereof

A silver compound and compound technology, which is applied in the directions of heavy metal compound active ingredients, phosphorus compound active ingredients, pharmaceutical formulations, etc., can solve problems such as the limited speed of gene transmission

Pending Publication Date: 2022-03-29
THE UNIVERSITY OF HONG KONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although phosphoethanolamine (pEtN) transferase in bacteria can catalyze the addition of phosphoethanolamine to lipid A and subsequently induce colistin resistance by weakening the electrostatic interaction between positively charged colistin and negatively charged cell membranes Sex, but due to chromosome-mediated, the speed of its gene transmission is limited

Method used

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  • Silver/gold compounds and methods thereof
  • Silver/gold compounds and methods thereof
  • Silver/gold compounds and methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Example 1: Crystallographic studies of silver / gold bound to MCR-1

[0073] Plasmid construction of wild-type mcr-1, mcr-1 variants, other mcr genes, and mutant and truncated mcr-1 forms

[0074] Primary plasmids encoding full-length MCR-1 and primary plasmids encoding soluble truncated parts (200-541 aa) were collected from Dr. Pak Leung Ho's group (Hong Kong University) and Prof. Hao Quan's group (Hong Kong University), respectively. These primary genes were subcloned into pCR-XL-TOPO and pET-15b vectors via SacI / BamHI restriction sites and NdeI / BamHI restriction sites, respectively. All subsequent modified plasmids were constructed from the primary plasmid as a template for PCR. Point mutations were introduced into the mcr-1 gene using the QuickChange (Stratagene) commercial kit, and verified by DNA sequencing (BGI, China). PCR was performed using KOD Hot Start DNA Polymerase (Novagen) according to the reaction conditions described in the manufacturer's protocol. A...

Embodiment 2

[0081] Example 2: In Vitro Mechanism Study of Enzyme Inhibition

[0082] ITC assay

[0083] Apo-MCR-1-S without any tag was diluted to a concentration suitable for the ITC assay. (1) 1mM Zn(Ac) 2 Added to 30μM apolipoprotein-MCR-1-S; (2) 1.1mM AgNO 3 Added to 7 μM Apo-MCR-1-S; (3) Added 1.1 mM AuCl to 30 μM Apo-MCR-1-S; (4) Added 1 mM other compounds to 30 μM Apo-MCR -1-S. Negative groups were performed in dialysis buffer with or without 1% DMSO, as appropriate. The stoichiometry and binding affinities of metal binding were obtained by fitting the data with appropriate equations, and these assays were performed in triplicate. Such as image 3 As shown in, MCR-1-S and AgNO 3 , AuCl and Zn(Ac) 2 The binding dissociation constant (K d ) were determined to be about 0.2 μM, 0.8 μM and 2.45 μM, respectively. Corresponding data such as image 3 shown.

[0084] PAR detection

[0085] By Varian (Varian) Cary 50 spectrophotometer, at a rate of 360nm / min, using 1cm -1 Quart...

Embodiment 3

[0094] Example 3: Evaluation of antimicrobial activity in vitro

[0095] The antimicrobial activity of silver / gold against MCR-producing bacterial strains was examined. Methods involve cell-based minimal inhibitory concentration assays, time-kill assays, and in vitro cell infection assays.

[0096] bacteria

[0097] The bacteria used involved Escherichia coli J53, Escherichia coli DH5a, Escherichia coli BL-21, Escherichia coli clinical isolate 1493, Salmonella enterica clinical isolate, Salmonella typhimurium, Klebsiella pneumoniae pneumoniae), Shigella flexneri, Enterobacter aerogenes, Enterobacter asburiae, Enterobacter kobei.

[0098] Micro dilution MIC detection

[0099] First, the MIC values ​​of antibiotics or Bi(III) compounds were determined by standard broth microdilution method (Clinical and Laboratory Standards Institute (CLSI) M100-S20, 2010). Briefly, bacterial cells were cultured overnight in LB broth at 37°C at 250 rpm, using a microtiter plate reader at 600...

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Abstract

Disclosed are pharmaceutical compositions comprising (a) a polymyxin antibiotic and (b) a movable myxin resistance protein (MCR) inhibitor. The inhibitors relate to silver / gold compounds or pharmaceutically acceptable salts thereof. Also disclosed are methods of making the silver / gold compounds or pharmaceutically acceptable salts thereof and methods for treating MCR-producing bacterial infections via various mechanisms.

Description

technical field [0001] Pharmaceutical compositions, methods for treating bacterial infections producing inhibitors of mobile colistin resistance proteins, methods for modulating the activity of inhibitors of mobile colistin resistance proteins, and methods of making pharmaceutical compositions are disclosed. Background technique [0002] Antimicrobial resistance (AMR) has been a worldwide crisis since the clinical introduction of penicillin in the 1940s. In recent years, colistin, a polymyxin E family antibiotic, has been regarded as the last-line antibiotic against extensively drug-resistant (XDR) Gram-negative bacterial infections. Although phosphoethanolamine (pEtN) transferase in bacteria can catalyze the addition of phosphoethanolamine to lipid A and subsequently induce colistin resistance by weakening the electrostatic interaction between positively charged colistin and negatively charged cell membranes Sex, but due to chromosomal mediation, the speed of gene transmis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K38/12A61K33/38A61P31/04
CPCA61K38/12A61K33/38A61P31/04A61K33/242A61K31/7135A61K2300/00A61K31/28A61K31/555A61K31/66
Inventor 孙红哲何柏良王润铭李洪艳章琪
Owner THE UNIVERSITY OF HONG KONG
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