超越合扭曲模型:单个 cupredoxin AcoP 域的结构分析,这是一个绿色单核铜中心,具有原始特征
Magali Roger1, Philippe Leone2, Ninian J Blackburn3
1CNRS, Aix-Marseille University, Bioenergetic and Protein Engineering Laboratory, BIP UMR 7281, Mediterranean Institute of Microbiology, 13009 Marseille, France. giuliano.sciara@inrae.fr.
Dalton transactions (Cambridge, England : 2003)
|January 3, 2024
概括
铜素是各种各样的铜结合蛋白. 这项研究揭示了AcoP,一种来自Acidithiobacillus ferrooxidans的独特的铜,具有受约束的铜中心和潜在的铜协调新模型.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 生物有机化学 生物有机化学
背景情况:
- 毒素是具有希腊键β桶折叠的铜结合蛋白,通常通过T1铜中心作为电子载体.
- 新的铜素发现突出显示了铜联体,中心几何,氧化还原潜力和生物作用的显著多样性.
- AcoP是来自Acidithiobacillus ferrooxidans的周等离子铜,具有独特的特征,如高抗酸性和受限制的高氧化潜在铜中心.
研究的目的:
- 通过结构和生物物理特征阐明AcoP的独特特性.
- 研究特定的铜联体 (H166A,M171A) 在AcoP的结构和功能中的作用.
- 探索 AcoP 结构对铜协调模型的影响.
主要方法:
- 用X射线衍射测定野生类型AcoP和突变物的晶体结构.
- 扩展的X射线吸收细结构 (EXAFS) 用于金属中心分析.
- 与其他已知的铜素进行比较的结构分析.
主要成果:
- 晶体结构显示出典型的cupredoxin折叠与延长的循环可能参与合作伙伴相互作用.
- EXAFS和X射线衍射数据表明,AcoP的铜中心表现出混合的T1和T1.5特征,偏离了合扭曲模型.
- 突变结构证实了一个高度受约束的活跃中心,在第二个协调球体中有一个广泛的键网络,有助于刚性.
结论:
- AcoP具有独特的结构和电子特征,包括具有混合T1/T1.5特征的受约束铜中心.
- 合扭曲模型可能无法完全解释所有铜中铜中心的几何形状,这表明需要替代模型.
- 机架诱导的贡献和第二协调球相互作用是cupredoxins中活性中心刚性的关键决定因素.
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