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发现了对Acinetobacter baumannii感染有效的GuaB抑制剂

Eric M Kofoed¹, Ignacio Aliagas², Terry Crawford³

¹Department of Infectious Diseases, Genentech Inc., South San Francisco, California, USA.

|August 29, 2024

概括

研究人员发现了强大的小分子抑制剂,向细菌的氨酸-5-单酸脱酶 (GuaB). 这些抑制剂对包括Acinetobacter baumannii在内的多药耐药细菌具有杀菌功效,验证了GuaB作为关键的抗生素标.

科学领域:

微生物学和分子生物学
药物发现和开发药物发现和开发

背景情况:

关氨酸核酸对于细胞功能至关重要,包括DNA/RNA合成和细胞分裂.
菌酸 (MPA) 抑制人体氨酸-5'-单酸脱酶 (IMPDH),但其对抗细菌IMPDH (GuaB) 的有效性作为抗菌策略仍在争论中.
多药耐药细菌的兴起需要新的抗生素机制.

研究的目的:

研究抑制细菌GuaB作为一种新型抗菌策略的潜力.
发现和描述细菌GuaB (GuaBi) 的强效,特定的小分子抑制剂.
评估瓜比在体内对病原细菌,特别是Acinetobacter baumannii的有效性.

主要方法:

对细菌标具有高特异性的小分子GuaB抑制剂 (GuaBi) 的发现和表征.
评估瓜比对各种病原体的杀菌活性,包括多种耐药菌株.
在体内使用Acinetobacter baumannii感染的小鼠模型的疗效研究.
细菌GuaB蛋白质的共同晶体结构的确定与抑制剂复合,以阐明结合模式.

主要成果:

鉴定了具有较低自发抗性率的高强度GuaBi.
在小鼠体内证明瓜比对Acinetobacter baumannii感染的细菌杀菌效果.
瓜比对抗多种耐药性病原体表现出活性,解决了抗生素开发中的关键未满足需求.
结构分析揭示了GuaBi在不同细菌物种 (A. baumannii,S. aureus,E. coli) 中保留的结合模式,确定了预测活性的关键残留物.

结论:

通过GuaB药理上抑制新的瓜生物合成是一种经过验证的杀菌策略.
发现的GuaBi代表了一种有前途的新型抗生素类别,对关键优先病原体有效.
结构性见解为进一步优化和开发用于临床使用的GuaB抑制剂提供了基础.

关键词:

这种细菌是Acinetobacter baumannii.针对抗生素的目标验证.细菌遗传学细菌遗传学药用化学药用化学药理学药理学药理学药理学药理学结构生物学结构生物学

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