[ψ[CH
2
NH]PG
4
] glycopeptide antibiotic analogs are reengineered forms of glycopeptides that exhibit antimicrobial activity against both wild type and glycopeptide antibiotic resistant strains of microorganisms. For example, [ψ[CH
2
NH]Tpg
4
] vancomycin aglycon is a reengineered form of vancomycin that exhibits antimicrobial activity (MIC=31 μg/mL) against both wild type and VanA resistant organism (
E. faecalis
BM4166). The VanA resistant organism achieves its resistance, upon glycopeptide antibiotic challenge, by remodeling its D-Ala-D-Ala peptidoglycan cell wall precursor to D-Ala-D-Lac. [ψ[CH
2
NH]PG
4
] glycopeptide antibiotic analogs have an altered glycopeptide backbone wherein the carbonyl of the fourth amino acid residue of the glycopeptide backbone has been replaced with a methylene. This alteration of the glycopeptide backbone imparts dual binding affinities for both D-Ala-D-Ala and D-Ala-D-Lac and dual antimicrobial activities for both wild type and resistant strains. For example, [ψ[CH
2
NH]Tpg
4
]vancomycin aglycon displays a antimicrobial potency that reflects its altered binding characteristics.
[ψ[CH2NH]
PG4] 糖肽
抗生素类似物是糖肽的重新设计形式,对野生型和糖肽
抗生素耐药菌株都表现出抗微
生物活性。例如,[ψ[CH2NH]T
PG4]
万古霉素裸核是
万古霉素的重新设计形式,对野生型和VanA耐药菌株(E. faecalisB
M4166)都表现出抗微
生物活性(MIC=31 μg/mL)。VanA耐药菌株通过重塑其D-Ala-D-Ala肽聚糖细胞壁前体为D-Ala-D-Lac,在糖肽
抗生素挑战下获得其抗性。[ψ[CH2NH]
PG4] 糖肽
抗生素类似物具有改变的糖肽骨架,其中糖肽骨架的第四个
氨基酸残基的羰基被亚
甲基取代。这种糖肽骨架的改变赋予了对D-Ala-D-Ala和D-Ala-D-Lac的双重结合亲和力,以及对野生型和耐药菌株的双重抗微
生物活性。例如,[ψ[CH2NH]T
PG4]
万古霉素裸核显示出反映其改变的结合特性的抗微
生物效力。