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Area of Science:

  • Structural Biology
  • Biochemistry
  • Molecular Recognition

Background:

  • Polyproline recognition is vital in biomedicine but not fully understood.
  • Existing models of SH3 (Src homology 3) domain binding conflict with thermodynamic data.
  • Abl-SH3 domain's dual binding mechanism involving water-mediated hydrogen bonds was recently identified.

Purpose of the Study:

  • To investigate the universality of the dual binding mode in SH3 domains.
  • To analyze the role of interfacial water molecules in polyproline recognition across various protein domains.
  • To propose a revised paradigm for understanding proline-rich sequence recognition.

Main Methods:

  • Systematic analysis of the SH3 structural database.
  • Identification and analysis of tightly bound, buried-interfacial water molecules in SH3 complexes.
  • Examination of hydration sites and their relationship with ligand and domain sequences.
  • Observation of water-mediated interactions in WW, UEV, and EVH-1 domains.

Main Results:

  • The dual binding mode involving water-mediated hydrogen bonds is universal to SH3 domains.
  • Interfacial water molecules consistently mediate interactions between SH3 domains and peptide ligands.
  • Conserved hydration sites and relationships between hydration profiles and sequences were identified.
  • Water-mediated interactions are prevalent in WW, UEV, and EVH-1 domain structures.

Conclusions:

  • The current understanding of proline-rich sequence recognition by protein modules is incomplete.
  • Interfacial water molecules are essential components of polyproline recognition.
  • A new binding paradigm incorporating water-mediated interactions is required for accurate comprehension.