Structural modeling of histone methyltransferase complex Set1C from Saccharomyces cerevisiae using constraint-based...

Area of Science:

• Molecular biology
• Structural biology
• Computational biology

Background:

• Set1C is an essential eight-subunit histone methyltransferase complex involved in yeast gene regulation.
• Understanding the three-dimensional structure of Set1C is crucial for elucidating its functional mechanisms.
• Previous modeling approaches for large complexes faced challenges due to combinatorial complexity in subunit docking.

Purpose of the Study:

• To develop a constraint-based docking approach for modeling the Set1C complex structure.
• To utilize protein interaction and functional data to guide the assembly of subunits.
• To identify conserved structural elements and interfaces within the Set1C complex.

Main Methods:

• Modeled individual subunits of the Set1C complex.
• Developed and applied a constraint-based docking strategy to assemble the subunits.
• Incorporated high-quality protein interaction and functional data as constraints in the docking procedure.

Main Results:

• Generated 22 distinct structural models for the Set1C complex.
• Identified a highly conserved core complex (Set1, Bre2, Sdc1, Swd2) present in over 50% of the models.
• Characterized both high-confidence and lower-confidence subunit interfaces.

Conclusions:

• The constraint-based docking approach successfully modeled the Set1C complex.
• The conserved core structure provides high confidence regarding the arrangement of key subunits.
• The characterized interfaces offer insights into the functional mechanisms of Set1C in yeast gene regulation.