k无作用/KI 活细胞中的青素结合蛋白的价值确定
Joshua D Shirley1, Jacob R Gillingham2, Kelsie M Nauta3
1Department of Medicinal Chemistry, University of Minnesota, 208 Harvard Street SE, Minneapolis, Minnesota 55454, United States.
一种新的全细胞测定准确地测量了β-乳酸抗生素对Streptococcus pneumoniae中的青素结合蛋白 (PBPs) 的功效. 这种方法提供了比传统分析更可靠的抗生素有效性评估.
科学领域:
- 微生物学 微生物学
- 生物化学 生物化学
- 药理学 药理学是指药理学的学科.
背景情况:
- 青素结合蛋白 (PBP) 是β-乳酸抗生素准的关键细菌酶.
- 抑制PBPs会扰乱酸甘的合成,导致细菌细胞死亡.
- 传统的IC50值对于时间依赖的共价抑制剂,如β-乳酸,可能会产生误导性.
研究的目的:
- 开发和验证一种全细胞试验,以确定向细菌PBPs的共价抑制剂的效力.
- 为了建立比IC50更合适的PBP抑制剂强度指标,特别是第二阶速率常数 (k_inact/K_I).
- 为了能够在多个PBP同类中对β-乳酸功效进行高通量选.
主要方法:
- 使用基于光活动的探测器Bocillin-FL进行全细胞检测的开发.
- 测量第二阶速常数 (k_inact/K_I) 对于*Streptococcus pneumoniae*中的PBP抑制.
- 整细胞测定结果与已建立的体外k_inact/K_I和IC50数据的比较.
主要成果:
- 开发的全细胞试验成功确定了*Streptococcus pneumoniae*中的PBP抑制剂功效.
- 全细胞测定结果与体外k_inact/K_I测量结果相对相关.
- 新的测试表明与之前报告的IC50值存在可比的关系,验证了其实用性.
结论:
- 全细胞k_inact/K_I测定是一种有效和有效的方法来评估β-lactam抗生素对PBPs的效力.
- 这种测定有助于研究PBP抑制剂的结构-活性关系.
- 该方法提供了一种可扩展的方法,用于评估各种PBP目标的抗生素效力.
更多相关视频
19:16The Importance of Correct Protein Concentration for Kinetics and Affinity Determination in Structure-function Analysis
Published on: March 17, 2010
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
The Equilibrium Binding Constant and Binding Strength
Protein-Drug Binding: Determination Methods
Indirect methods involve isolating the bound drug from its free form in biological samples such as blood, serum, or plasma. These techniques aim to measure the percentage of drugs bound to proteins. Equilibrium dialysis is a commonly used method where the free drug concentration at equilibrium is measured by separating the bound...
Determination of Michaelis Constant and Maximum Elimination Rate
These parameters can be estimated by analyzing plasma concentration data post-drug administration. A notable example of this application is phenytoin, a drug with capacity-limited kinetics. It's recommended that phenytoin should be administered at two...
One-Compartment Open Model: Wagner-Nelson and Loo Riegelman Method for ka Estimation
On...
Physiological Pharmacokinetic Models: Assumption with Protein Binding
Factors Affecting Protein-Drug Binding: Drug-Related Factors
One crucial factor in drug-protein binding is the drug's lipophilicity or its affinity for fat. More lipophilic drugs tend to have higher binding extents. For example, highly lipophilic drugs like cloxacillin exhibit substantial protein binding, with as much as 95% of the drug binding to proteins. In...
