Exploring the structural landscape of DNA maintenance proteins

Area of Science:

• Genomics
• Molecular Biology
• Evolutionary Biology

Background:

• Genome maintenance (GM) proteins are crucial for cellular stability.
• Conventional evolutionary annotation relies on sequence similarity, often failing for distantly related proteins.

Purpose of the Study:

• To systematically apply sensitive profile-to-profile methods for evolutionary annotation of GM proteins.
• To identify novel GM protein candidates and annotate protein domains across species.

Main Methods:

• Utilized iterative profile-to-profile methods for homology detection.
• Systematically surveyed GM proteins from bacteria to humans.
• Performed experimental validation of identified domains in specific protein families.

Main Results:

• Identified multiple novel GM protein candidates.
• Annotated domains in established GM proteins, including PARP, OB-fold, Macro, TUDOR, SAP, BRCT, KU, MYB (SANT), and nuclease domains.
• Experimentally validated OB-fold and MIS18 (Yippee) domains in SPIDR and FAM72 families, respectively.

Conclusions:

• The repertoire of genome stability caretakers is larger and less understood than previously thought.
• Profile-to-profile methods are effective for uncovering evolutionary relationships of GM proteins.
• Further research is needed to fully appreciate the diversity and function of GM proteins.