相关实验视频

Updated: Jun 15, 2025

Production, Crystallization and Structure Determination of C. difficile PPEP-1 via Microseeding and Zinc-SAD

Production, Crystallization and Structure Determination of C. difficile PPEP-1 via Microseeding and Zinc-SAD

Published on: December 30, 2016

来自Synechocystis sp.的一个假定酸盐结合蛋白的晶体结构. PCC 6803揭示了一个进化热点

Chongyang Wang¹, Yiping Lu¹, Jiahui Sun¹

¹Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Songling Rd 189, Qingdao, 266101, China; Shandong Energy Institute, Songling Rd 189, Qingdao, 266101, China; Qingdao New Energy Shandong Laboratory, Songling Rd 189, Qingdao, 266101, China; University of Chinese Academy of Sciences, Beijing, China.

Biochemical and biophysical research communications

|June 13, 2025

概括

研究人员研究了一种来自Synechocystis sp.的酸盐结合蛋白 (PBP). 这是PCC 6803. 一个关键氨基酸的突变显著提高了其酸结合亲和力,揭示了PBP发展的进化热点.

科学领域:

生物化学生化学
结构生物学结构生物学
微生物学微生物学

背景情况:

对于生命至关重要,通常是一种限制性营养素.
酸盐结合蛋白 (PBPs) 对于细胞的吸收和运输至关重要.
综合囊 sp. 的情况. PCC 6803是一种具有环境意义的蓝色细菌.

研究的目的:

为了确定来自Synechocystis sp.的sll0540编码的PBP的晶体结构. 这是PCC 6803.
为了研究这种PBP中酸盐结合的结构基础.
探索增强PBP酸盐结合亲和力的策略.

主要方法:

用X射线晶体学来确定与酸盐复合的蛋白质结构.
生物化学试验测量酸盐结合亲和力 (K_d).
位点定向的突变发生改变特定的氨基酸残留物.

主要成果:

晶体结构显示出典型的ABC酸盐运输受体折叠,酸盐在裂中.
Sll0540具有相对较低的酸盐结合亲和力 (K_d = 223.7 μM).
将Asp225转变为Asn或Ser显著增加了酸盐结合亲和力.

结论:

这项研究阐明了Synechocystis PBP及其酸盐结合机制的结构特征.
Asp225在调节酸盐亲和力方面发挥着至关重要的作用.
这些发现表明,开发PBP具有改进的酸盐获取能力的进化热点.

关键词:

晶体结构晶体结构进化热点是一个进化热点.酸盐结合蛋白质是一种酸盐结合蛋白质.在Sll054040中,你会发现

更多相关视频

Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092

Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092

Published on: October 2, 2017

Recombinant Protein Expression, Crystallization, and Biophysical Studies of a Bacillus-conserved Nucleotide Pyrophosphorylase, BcMazG

Recombinant Protein Expression, Crystallization, and Biophysical Studies of a Bacillus-conserved Nucleotide Pyrophosphorylase, BcMazG

Published on: May 16, 2017

相关概念视频

Protein Kinases and Phosphatases

Protein Kinases and Phosphatases

Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...

Phosphorylation

Phosphorylation

The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...