从Acinetobacter baumannii获得 δ-poly-L-ornithine聚合物生物合成的结构和功能洞察力
Ketan D Patel1, Andrew M Gulick2
1Department of Structural Biology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, SUNY, Buffalo, NY, 14203, USA.
Communications biology
|September 26, 2023
概括
研究人员在Acinetobacter baumannii中发现了一种新酶PosA,该酶可以产生聚L-ornithine,一种阴离子同型聚胺酸. 这种聚合物显示出作为抗真菌剂的潜力,扩大了这些的已知微生物来源.
科学领域:
- 微生物学 微生物学
- 生物化学 生物化学
- 自然产品 化学 化学
背景情况:
- 从Actinomycetes中已知具有异类键的阴阳性同型聚胺酸 (CHPA) .
- 此前从其他细菌物种中没有报告CHPA的产生.
研究的目的:
- 为了识别和表征新型CHPA合成酶及其产物从细菌超出Actinomycetes.
- 为了研究从Acinetobacter baumannii中新发现的一种酶的酶活性和基质特异性.
- 探索合成CHPA的生物活性和潜在应用.
主要方法:
- 使用PosA的净化腺化域进行的酶分析.
- 腺化域的结构分析.
- 酵素产品的生物化学表征,聚-L-ornithine.
- 聚-L-ornithine的化学合成和生物活性测试.
- 对同源酶进行基因组挖掘.
主要成果:
- 在Acinetobacter baumannii中发现了一种新的δ-poly-L-ornithine合成酶 (PosA).
- PosA利用L-ornithine生产具有7-12个氨基酸单元和异链接的聚L-ornithine.
- 化学合成的聚-L-ornithine具有抗真菌活性.
- 结构和生化分析确定了PosA中的关键基质结合残留物.
- 在其他细菌中发现了具有不同基质特异性的同源酶.
结论:
- 宝曼尼菌通过新型酶PosA.产生聚-L-ornithine.
- 聚-L-ornithine代表了一个新的CHPA类,具有潜在的抗真菌应用.
- 这项研究扩大了已知的CHPA生产的微生物多样性,并建议进一步探索未经表征的天然产品.
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