在无氧条件下需要来自Bacillus subtilis的coproheme脱碳酶进行细菌生长和heme b生物合成
Nikolaus Falb1, Robert Warneke2, Johannes Stadlmann1
1BOKU University, Institute of Biochemistry, Department of Natural Sciences and Sustainable Resources, Vienna, Austria.
Free radical biology & medicine
|August 24, 2025
概括
研究人员在阳性细菌中探索了血生物合成,发现共血脱碳酶 (ChdC) 可以使用FMN作为辅基质无氧运作,为新的抗生素开发铺平了道路.
科学领域:
- 生物化学
- 微生物学
- 分子生物学
背景情况:
- 血红蛋白生物合成途径在各个生物体之间有所不同,其中共氨酸依赖性 (CPD) 途径是格拉姆阳性细菌特有的.
- 甲基脱碳酶 (ChdC) 催化了CPD途径的最后一步,将甲基转化为乙基.
- 过氧化 (H2O2),此前被认为是ChdC的必需物,由于细胞毒性和无氧条件下低于最佳性能而存在限制.
研究的目的:
- 研究一种没有过氧化的血生物合成途径.
- 描述可替代的共基质对甲基脱碳酶 (ChdC) 的活性.
- 为了确定阳性模型生物 Bacillus subtilis 中 ChdC 的无氧功能.
主要方法:
- 在Bacillus subtilis中生成淘汰菌株 (ΔchdC),以评估血红素变.
- 作为ChdC的潜在替代辅助基质的flavodoxins (YkuN,YkuP) 的表征.
- 使用极光氧水平测定,液体色谱,质谱和时间分辨率光谱的酶分析.
主要成果:
- 在有氧和无氧生长条件下,dchdC菌株表现出血辅食性.
- 鉴定出自由和与蛋白质结合的FMN (来自YkuN和YkuP的黄素) 是有效的替代CdC辅助基质.
- 在性pH条件下,ChdC与FMN表现出无氧活性.
结论:
- 这项研究证实了ChdC在Bacillus subtilis的血生物合成中的必要性.
- 弗拉单核酸 (FMN) 作为一种可行的无氧共基质,可以克服H2O2的局限性.
- 这些发现突显了ChdC无氧作用的潜力,为针对格拉姆阳性病原体的抗生素开发提供了新的途径.
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