来自Halorubellus sp.的一种新型haloysin的鉴定和生物化学表征. PRR65具有相对较高的温度活动
Yuling Hao1, Yu Jin1, Aodi Zhang1
1College of Life Sciences, Anhui Normal University, Wuhu, 241001, Anhui, China.
World journal of microbiology & biotechnology
|October 2, 2024
概括
研究人员克隆并表达了一种来自Halorubellus sp.的新型haloarchaeal蛋白酶Hly65. 在PRR65.5中,我们使用了PRR65. 这种素表现出独特的特性,包括催化三合体和单体功能,在工业中具有潜在的应用.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 极端爱好研究 极端爱好研究
背景情况:
- 来自haloarchaea的细胞外蛋白质酶或氨酸酶在工业应用中越来越重要.
- 氨酸被用于调味品和皮革工业,推动对新型酶的需求.
研究的目的:
- 克隆并异质地表达来自Halorubellus sp.的细胞外蛋白酶基因 (hly65). 在PRR65.5中,我们使用了PRR65.
- 描述新型素Hly65的特征,阐明其酶特性和结构特征.
主要方法:
- 在大肠杆菌中基因克隆和异质表达.
- 酶活性测定使用甲硫化物 (PMSF) 和dithiothreitol (DTT).
- 动力参数的确定 (Km,Vmax,Kcat) 和3D结构的预测.
主要成果:
- 在大肠杆菌中成功克隆和表达了hly65基因,产生了haloysin Hly65.
- PMSF完全抑制了Hly65的活性,表明一种血清蛋白酶,并且不受DTT的影响,表明单体功能.
- 该酶具有催化三合一 (Asp154 - His193 - Ser348) 和在60°C,pH8.0和4.0M NaCl时的最佳活性.
- 确定了运动参数:Km = 2.91 mM,Vmax = 1230.47 U·mg-1,以及Kcat = 1538.09 S-1.
结论:
- Hly65是一种来自Halorubellus sp.的新型单体胺醇素. PRR65具有明显的催化三合一.
- 鉴定提供了关于氨酸结构-功能关系的见解,这对酶工程至关重要.
- 预测的3D结构将有助于修改素,用于增强或新型的工业应用.
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