Advancements and challenges in protein purification techniques for denitrifying enzymes: A path to effective nitrogen removal and reduced N₂O emissions

The biological denitrification process is crucial for removing nitrogen and reducing nitrous oxide (N₂O) emissions. To investigate the mechanism of action of key enzymes in the denitrification process, it is necessary to analyze the protein structure, active site, and conformational changes of denitrifying enzymes. X-ray crystallography, nuclear magnetic resonance (NMR), and cryogenic electron microscopy (Cryo-EM), as well as spectroscopic analyses such as Raman resonance and UV-vis, have been used to study the structure of denitrifying enzymes. However, practical application is limited by protein folding and assembly, as well as issues of purity, concentration, and homogeneity. This review summarizes the biochemical properties of the four denitrifying enzymes and typical purification methods. Additionally, this review emphasizes important factors to consider during protein expression, crude extract, and chromatographic purification. It also provides insight into the future development of protein purification methods for denitrifying enzymes. This review aims to bridge the gap between the complex biochemical process of denitrifying enzymes and the technical intricacies of protein purification, with the ultimate goal of reducing N₂O emissions in ecosystems.生物脱氮过程对于脱除氮素并降低一氧化二氮（N₂O）排放至关重要。为探究脱氮过程中关键酶的作用机制，需对脱氮酶的蛋白质结构、活性位点以及构象变化开展分析。X射线晶体学（X-ray crystallography）、核磁共振（NMR）、低温电子显微镜（Cryo-EM），以及拉曼共振（Raman resonance）、紫外-可见光谱（UV-vis）等光谱分析手段，已被用于脱氮酶的结构研究。然而，其实际应用受到蛋白质折叠与组装、以及纯度、浓度和均一性等问题的制约。本综述总结了四类脱氮酶的生化特性及其典型纯化方法，同时着重阐述了蛋白质表达、粗提液处理与色谱纯化过程中需考量的关键要素，并对脱氮酶蛋白质纯化方法的未来发展方向提供了前瞻性见解。本综述旨在弥合脱氮酶复杂生化过程与蛋白质纯化技术复杂性之间的鸿沟，最终达成降低生态系统中N₂O排放的目标。

搜集汇总

背景与挑战

背景概述

该数据集是一篇综述性文章，聚焦于脱氮酶蛋白纯化技术的进展与挑战，旨在促进有效的氮去除和减少N2O排放。它总结了四种脱氮酶的生化特性、典型纯化方法，并讨论了蛋白质表达和纯化过程中的关键因素，以弥合脱氮酶复杂生化过程与纯化技术之间的差距。