Functionality of wrapping defects in soluble proteins: what cannot be kept dry must be conserved

Area of Science:

• Biochemistry
• Structural Biology
• Proteomics

Background:

• Soluble proteins require hydrophobic core formation to shield backbone hydrogen bonds from water.
• Improperly shielded hydrogen bonds can compromise protein structure and stability.
• Protein-ligand interactions can stabilize structures with exposed hydrogen bonds.

Purpose of the Study:

• To investigate the functional relevance of deficiently wrapped hydrogen bonds in soluble proteins.
• To explore the relationship between under-wrapped hydrogen bonds and protein structural integrity.
• To understand the evolutionary implications of these structural features.

Main Methods:

• Analysis of protein folding domains and proteomic connectivity data.
• Utilizing large-scale yeast two-hybrid experiments.
• Assessing residue conservation patterns in relation to hydrogen bond wrapping.

Main Results:

• A statistically significant linear correlation was found between folding domain defects and proteomic connectivity.
• Residues involved in under-wrapped hydrogen bonds exhibit high conservation.
• Under-wrapped regions demonstrate adhesive properties, functioning as binding sites.

Conclusions:

• Deficiently wrapped hydrogen bonds are functionally significant for maintaining protein structure.
• The adhesive nature of under-wrapped regions contributes to their role as binding sites.
• High conservation of these regions underscores their critical role in protein function and stability.