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Updated: Jan 6, 2026

Analyzing Protein Architectures and Protein-Ligand Complexes by Integrative Structural Mass Spectrometry

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Published on: October 15, 2018

Understanding the Roles of Secondary Shell Hotspots in Protein-Protein Complexes.

Jayadevan Parvathy^1,2, Arangasamy Yazhini³, Narayanaswamy Srinivasan²

¹Interdisciplinary Mathematical Sciences Initiative (IMI), Indian Institute of Science, Bangalore, India.

|October 18, 2025

Summary

This summary is machine-generated.

We identified secondary shell hotspots, unique protein residues crucial for complex stability. These buried residues, identified via distance-based methods, are evolutionarily conserved and vital for protein function and activity.

Keywords:

accessible surface area (ASA)hotspot residues interface residues perturbation response scanning (PRS)protein sidechain network (PScN)protein–protein interactions residue conservation

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Area of Science:

Structural Biology
Computational Biology
Biochemistry

Background:

Hotspots are key residues in protein-protein complexes, significantly impacting stability.
Current identification methods include distance-based and solvent accessibility (ASA)-based approaches.

Purpose of the Study:

Introduce and characterize secondary shell hotspots, identified uniquely by distance-based methods.
Investigate their evolutionary conservation, biophysical properties, and functional significance.

Main Methods:

Analyzed 94 protein-protein complexes from Docking Benchmark 5.5.
Applied distance-based methods to identify secondary shell hotspots.
Examined evolutionary conservation, Chou-Fasman propensities, and interaction patterns.

Main Results:

Secondary shell hotspots are buried in both isolated and complexed states, forming direct interactions.
These hotspots exhibit higher evolutionary conservation and distinct properties compared to other hotspots.
In silico mutations significantly destabilize complexes, highlighting their critical role.

Conclusions:

Secondary shell hotspots are essential for protein-protein complex stability and activity.
They may act as allosteric propagators, bridging interfacial and non-interfacial regions.
Understanding these unique hotspots offers insights into protein complex regulation.