Thermo-search: lifestyle and thermostability analysis

Area of Science:

• Biochemistry
• Bioinformatics
• Proteomics

Background:

• Proteome and protein analysis often requires understanding thermal stability.
• Identifying thermostable proteins is crucial for various biotechnological applications.
• Existing methods may not efficiently screen large datasets for thermophilic adaptations.

Purpose of the Study:

• To introduce Thermo-search, a novel web tool for analyzing proteomes and proteins based on amino acid composition.
• To investigate the correlation between specific amino acid ratios and protein thermostability across different temperature-loving organisms.
• To enable rapid screening of protein databases for thermostable proteins and comparative analysis of organism lifestyles.

Main Methods:

• Development of an online web tool, Thermo-search.
• Analysis of proteomes and individual proteins using the ratio of glutamic acid plus lysine (E+K) to glutamine plus histidine (Q+H).
• Comparison of this ratio in hyperthermophiles, thermophiles, and mesophiles, and screening of the CRM database.

Main Results:

• The (E+K)/(Q+H) ratio is significantly higher in thermophilic proteomes and thermostable proteins compared to mesophilic counterparts.
• Thermo-search facilitates rapid identification and categorization of thermostable proteins within databases.
• The tool enables visualization and comparison of average (E+K)/(Q+H) ratios across organisms, offering insights into their lifestyles.

Conclusions:

• The (E+K)/(Q+H) amino acid ratio serves as a reliable indicator of protein and proteome thermostability.
• Thermo-search is a valuable tool for bioinformatics, aiding in the discovery of thermostable proteins and understanding microbial adaptation.
• This approach provides a new perspective for comparing organism lifestyles based on their proteomic thermal properties.