非血红铁模型复合物可以调节直接的NO降解:对FlavodiironNO降解酶的机制洞察
Hai T Dong1, Corey J White1, Bo Zhang2
1Department of Chemistry , The University of Michigan , Ann Arbor , Michigan 48109-1055 , United States.
Journal of the American Chemical Society
|September 18, 2018
概括
研究人员开发了一种新的铁复合物,可以直接将氧化 (NO) 转化为氧化 (N2O). 这一突破有助于了解细菌酶如氧化酶 (FNORs) 在慢性感染中如何起作用.
科学领域:
- 生物有机化学
- 酵素学
- 致病微生物学
背景情况:
- 黄氧化物减少酶 (FNOR) 是致病细菌中的关键酶,通过排毒氧化物 (NO) 能够在宿主环境中生存.
- 了解FNOR机制对于开发抗慢性细菌感染的策略至关重要.
- 之前的研究没有直接证据表明非血红二铁复合物能够调节NO的减少.
研究的目的:
- 合成和描述一种能够直接将氧化物 (NO) 降解为氧化物 (N2O) 的新型非二铁模型复合物.
- 阐明通过二铁复合物减少NO的机制,并提供有关FNOR活性的见解.
- 为了证明一种新的合成途径,用于对细菌存活相关的NO排毒.
主要方法:
- 使用紫外线,红外线,核磁共振,莫斯巴尔光谱学,循环电压测量和质谱学合成和表征差异性二铁前体.
- 使用cobaltocene (CoCp2) 将differric复合物减少为一种高度反应的differrous物种.
- 通过X射线结晶学和光谱技术分离和描述差异性复合物,然后与NO气体反应并使用红外气体头空间分析分析N2O产量.
主要成果:
- 一个新型二铁模型复合物的成功合成和完整表征, [Fe2((Py2PhO2) MP) ((OPr) 2) ((OTf).
- 反应性差异性复合物的隔离和结构/光谱特征.
- 氧化物 (NO) 转化为氧化物 (N2O) 的定量转化在氧化物复合物与NO反应时,通过IR气体头空间分析得到证实.
结论:
- 这项研究介绍了第一个非血二铁模型复合体,该模型展示了直接的,量化降低NO到N2O,而没有先前过度降低.
- 这些发现直接支持了氧化铁减少酶 (FNORs) 的拟议机制.
- 这项研究提供了一个新的模型系统,用于研究细菌中的NO排毒途径和潜在的治疗点.
相关概念视频
Mechanistic Models: Overview of Compartment Models
385
Mechanistic models, a category encompassing both physiological and compartmental modeling, differ from empirical models' approaches to incorporating known factors about the systems being modeled. Empirical models describe data with minimal assumptions, while mechanistic models aim to provide a robust description of available data by specifying assumptions and integrating known factors about the system. Compartmental analysis is a key example of a mechanistic model in pharmacokinetics and...
385
Mechanistic Models: Compartment Models in Individual and Population Analysis
270
Mechanistic models are utilized in individual analysis using single-source data, but imperfections arise due to data collection errors, preventing perfect prediction of observed data. The mathematical equation involves known values (Xi), observed concentrations (Ci), measurement errors (εi), model parameters (ϕj), and the related function (ƒi) for i number of values. Different least-squares metrics quantify differences between predicted and observed values. The ordinary least...
270
Mechanistic Models: Compartment Models in Algorithms for Numerical Problem Solving
319
Mechanistic models play a crucial role in algorithms for numerical problem-solving, particularly in nonlinear mixed effects modeling (NMEM). These models aim to minimize specific objective functions by evaluating various parameter estimates, leading to the development of systematic algorithms. In some cases, linearization techniques approximate the model using linear equations.
In individual population analyses, different algorithms are employed, such as Cauchy's method, which uses a...
In individual population analyses, different algorithms are employed, such as Cauchy's method, which uses a...
319
Oxidation-Reduction Reactions
75.7K
Oxidation–Reduction Reactions
75.7K
Protein Complex Assembly
16.8K
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
16.8K
Nonsense-mediated mRNA Decay
11.9K
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
11.9K


