生物学杂志 ›› 2025, Vol. 42 ›› Issue (6): 7-.doi: 10.3969/j.issn.2095-1736.2025.06.007

• 研究报告 • 上一篇    下一篇

脱氮假单胞菌胆碱脱氢酶BetA的晶体结构

肖正中1,2, 王明珠1,2,3   

  1. 1. 安徽大学 物质科学与信息技术研究院, 合肥 230601; 2. 安徽大学 生命科学学院, 合肥 230601;
    3. 安徽大学 安徽省人体微生态与精准医药重点实验室, 合肥 230601
  • 出版日期:2025-12-18 发布日期:2025-12-19
  • 通讯作者: 王明珠,博士,副研究员,研究方向为结构生物学,E-mail:wangmzh@ahu.edu.cn
  • 作者简介:肖正中,硕士研究生,研究方向为结构生物学,E-mail:xzz0917@hotmail.com
  • 基金资助:
    安徽省自然科学基金项目(2108085MC75)

Crystal structure of cholinedehydrogenase BetA from Pseudomonas denitrificans

XIAO Zhengzhong1,2, WANG Mingzhu1,2,3   

  1. 1. Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China; 2. School of Life
    Sciences, Anhui University, Hefei 230601, China; 3. Key Laboratory of Human Microenvironment and Precision
    Medicine of Anhui Higher Education Institutes, Anhui University, Hefei 230601, China
  • Online:2025-12-18 Published:2025-12-19

摘要: 为探究脱氮假单胞菌胆碱脱氢酶BetA的结构,构建重组质粒pET-28a-PdBetA表达纯化PdBetA蛋白进行结晶筛选,得到蛋白晶体并进行X射线衍射和数据收集,解析得到了1.8 分辨率的PdBetA晶体结构。在解析的PdBetA蛋白结构中,一个三股反平行β片层和一个五股平行β片层一起形成了一个双层的卷曲结构,在其所处位置反方向一侧,一个六股反平行β片层与在同侧的两个α螺旋处于近乎平行的状态。通过与其同源蛋白结构进行比较,推测PdBetA中同样具有一个黄素腺嘌呤二核苷酸结合口袋。

关键词: 维生素B12, 脱氮假单胞菌, 甜菜碱, 胆碱脱氢酶(BetA), 晶体结构

Abstract: To determine the structure of BetA fromPseudomonas denitrificans, the recombinant plasmid pET-28a-PdBetA was constructed to express and purifyPdBetA protein for crystallization experiments. X-ray diffraction analysis of the protein crystals yielded a 1.8  resolution structure ofPdBetA. ThePdBetA structure consists of a β sandwich fold comprising an antiparallel three-stranded β-sheet together with a parallel five-stranded β-sheet, and an antiparallel six-stranded β-sheet with two approximately parallel α-helices on the same side. Structural comparison and sequence alignment with its homologs suggested a potential flavin adenine dinucleotide binding pocket inPdBetA.

Key words: vitamin B12;Pseudomonas denitrifican, betaine, choline dehydrogenase(BetA), crystal structure

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