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Related Experiment Video

Updated: Jan 6, 2026

Detection of Phospholipase C Activity in the Brain Homogenate from the Honeybee

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Published on: September 14, 2018

Loop Plasticity Drives Paralog-Specific Recognition in BET ET Domains.

Guadalupe Alvarez¹, Elizabeth Sebastian¹, Arup Mondal¹

¹Chemistry department and Quantum Theory Project, University of Florida, Gainesville, FL, USA.

Biorxiv : the Preprint Server for Biology

|November 26, 2025

Summary

Bromodomain and extraterminal domain (BET) proteins show specific binding preferences due to subtle loop dynamics, not major shape changes. Local sequence variations tune BET protein interactions, aiding targeted therapies.

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Area of Science:

Molecular biology
Structural biology
Biophysics

Background:

Bromodomain and extraterminal domain (BET) proteins bind diverse peptides through conserved ET domains.
Paralog-specific binding preferences of BET proteins lack clear structural explanations.

Purpose of the Study:

Investigate the structural basis for paralog-specific peptide recognition by BRD3 and BRD4 ET domains.
Analyze interactions with peptide binders from NSD3 and murine leukemia virus integrase.

Main Methods:

Extensive molecular dynamics simulations.
Ensemble-based analyses.
Computational biophysics techniques.

Main Results:

Peptide recognition differences arise from subtle loop dynamics and local secondary structure variations, not large conformational changes.
Two divergent residues (positions 35 and 36) in a flexible loop modulate flanking helix formation and peptide-binding cavity opening.
BRD3 exhibits greater conformational plasticity and weaker binding, especially for NSD3, compared to BRD4.

Conclusions:

Local sequence variations fine-tune the conformational ensemble of BET ET domains.
These dynamics influence binding modes through conformational selection and induced fit mechanisms.
Provides a structural basis for the paralog-specific targeting of BET proteins.