Structural analysis of Wss1 protein from saccharomyces cerevisiae

Area of Science:

• Biochemistry
• Structural Biology
• Molecular Biology

Background:

• DNA-protein crosslinks (DPCs) pose a significant challenge to genome stability.
• Wss1 is a crucial enzyme responsible for repairing DPCs by degrading their protein components.

Purpose of the Study:

• To determine the crystal structure of the protease domain of Saccharomyces cerevisiae Wss1 (ScWss1).
• To compare the structure of ScWss1 with that of Schizosaccharomyces pombe Wss1 (SpWss1).
• To investigate the solution architecture of full-length ScWss1 and propose a DNA-binding activation mechanism.

Main Methods:

• X-ray crystallography to solve the crystal structure of the ScWss1 protease domain.
• Comparative structural analysis between ScWss1 and SpWss1.
• Small-angle X-ray scattering (SAXS) to study the solution architecture of full-length ScWss1.

Main Results:

• The crystal structure of the ScWss1 protease domain was determined and compared to SpWss1.
• A conserved cleft near the zinc ion was identified as a core region in Wss1 homologs.
• Significant variations in electronic surface distribution were observed between ScWss1 and SpWss1.
• SAXS analysis revealed a flexible region within the full-length ScWss1 protein.
• Structural insights led to a proposed mechanism for Wss1 activation by DNA substrates.

Conclusions:

• Structural comparison highlights conserved and divergent features of Wss1 across species.
• The identified flexible region and conserved core may be critical for Wss1 function.
• The proposed mechanism provides a framework for understanding how Wss1 interacts with and is activated by DNA substrates during DPC repair.