从大肠杆菌中分离出来的完全减少的终端氧化酶bd-I与化物结合
Vitaliy B Borisov1, Alexander M Arutyunyan2
1Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia; Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia.
化物特别与大肠杆菌细胞染色体bd-I中的heme d2+结合,这是一个潜在的抗菌标. 谱学研究揭示了一个单一的结合部位,并量化了这种关键酶的结合动力学和亲和力.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 频谱学是一种光谱学.
背景情况:
- 来自大肠杆菌的cytochrome bd-I是细胞呼吸所必不可少的原生细胞氧减少酶.
- 它拥有三个环 (b558,b595,d) 并产生质子运动力.
- 该酶的抗压能力使其成为新型抗微生物药物的有希望的目标.
研究的目的:
- 为了研究化物与净化,完全减少的细胞染色体bd-I相互作用的结合部位和动力学.
- 用光谱方法阐明化物结合中涉及的特定海姆.
主要方法:
- 电子吸收光谱检测在添加化物后的光谱变化.
- 通过MCD (磁性循环二元化) 光谱检测,以确认血红素的特异性.
- 动态分析以确定结合率和亲和力.
主要成果:
- 化物被证明只与减少的血红素d (血红素d2+) 结合.
- 光谱数据显示,在化物复杂化时,有特征性的光谱变化和W形索雷特带.
- 对血红素d2+-化物复合物的明显解离常数 (Kd) 确定为大约0.052 M.
- 动力学研究表明,单相结合过程的第二阶段速率常数 (kon) 约为0.1 M−1s−1.1.
结论:
- 化物与细胞染色体bd-I中的heme d2+单一部位结合,不影响hemes b558或b595.
- 这些发现与结构数据一致,证实活跃部位不是二部位.
- 描述的结合机制为酶抑制和潜在的抗微生物策略提供了洞察力.
更多相关视频
08:03Unveiling Xenobiotic Transport and Effects in Isolated Mitochondria: Insights from Respirometric and Enzymatic Assays
Published on: March 7, 2025
13:57Bio-layer Interferometry for Measuring Kinetics of Protein-protein Interactions and Allosteric Ligand Effects
Published on: February 18, 2014
相关概念视频
Electron Transport Chain: Complex III and IV
The Electron Transport Chain
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...
Phase II Reactions: Miscellaneous Conjugation Reactions
A key example involves the conjugation of cyanide ions, which impair cellular respiration and alter hemoglobin into non-oxygen-carrying cyanmethemoglobin. To neutralize this threat, a sulfur atom from thiosulphate is transferred to the cyanide ion, catalyzed by the enzyme rhodanese, resulting in an inactive compound called thiocyanate. The production of...
Electron Transport Chain: Complex I and II
ROS generation is regulated and maintained at moderate levels necessary...
Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism
