Investigating architecture and structure-function relationships in cold shock DNA-binding domain family using...

Area of Science:

• Molecular Biology
• Genomics
• Structural Biology

Background:

• The oligonucleotide/oligosaccharide-binding (OB) fold is crucial for DNA and RNA binding, regulating the central dogma.
• OB-fold domains are diverse and found in numerous proteins with varied molecular functions.

Purpose of the Study:

• To investigate the distribution of sequence, structure, and repeats of cold shock DNA-binding proteins (CSDB), an OB-fold member, across all three kingdoms.
• To establish functional relationships based on CSDB domain characteristics.

Main Methods:

• Bioinformatic analysis of CSDB domain distribution (S1, S12, S17, S28e) in bacteria, eukaryotes, and archaea.
• Correlation analysis between the number of S1 domain repeats and protein size in eukaryotes.
• Molecular function analysis of CSDB domains.
• Structural analysis of key CSDB domains (S1, S12, S17, S28e).

Main Results:

• CSDB domains, particularly S1, S12, S17, and S28e, are abundant, with S1 being the most prevalent.
• CSDB domains are predominantly found in bacteria (70-90%).
• The number of S1 domain repeats in eukaryotes correlates with protein size and is linked to diverse molecular functions.

Conclusions:

• The number and arrangement of CSDB domains, especially repeats within the S1 domain, are associated with specific molecular functions in both bacteria and eukaryotes.
• Structural insights into S1, S12, S17, and S28e domains provide a basis for understanding the relationship between domain repeats and protein function.