Adapting to salinity: structural dynamics of the DNA polymerase III beta subunit in Salinibacter ruber.

IF 2.6 3区 生物学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY
Aveepsa Sengupta, Dhrubajyoti Das, Anisha Debnath, Yusuf Akhter, Ashutosh Kumar
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引用次数: 0

Abstract

Halophilic bacteria thrive in high-salt environments through structural modifications in their proteins. One such adaptation is seen in the DNA polymerase III beta subunit, which acts as a "sliding clamp" for the DNA polymerase III, the replication machinery's key enzyme. Like other halophilic proteins, DNA Pol III beta of Salinibacter ruber displays an increased concentration of acidic amino acids, intrinsically disordered regions, and a negatively charged surface. A detailed study using interaction and molecular dynamics simulations analyses unveils the structural intricacies of S. ruber's beta subunit dimer at the molecular level. The elliptical shape of the dimer facilitates its efficient loading onto DNA in salty environments. Modifications in the dimer enable the DNA loading-unloading mechanism by stabilizing the dimeric conformation at high salt concentrations. Additionally, the study sheds light on the molecular-level conformational changes in the interfaces of the Pol III beta subunit.

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来源期刊
Extremophiles
Extremophiles 生物-生化与分子生物学
CiteScore
6.80
自引率
6.90%
发文量
28
审稿时长
2 months
期刊介绍: Extremophiles features original research articles, reviews, and method papers on the biology, molecular biology, structure, function, and applications of microbial life at high or low temperature, pressure, acidity, alkalinity, salinity, or desiccation; or in the presence of organic solvents, heavy metals, normally toxic substances, or radiation.
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