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Updated: Oct 18, 2025

Measuring In Vitro ATPase Activity for Enzymatic Characterization

Measuring In Vitro ATPase Activity for Enzymatic Characterization

Published on: August 23, 2016

Evolution of Thyroglobulin Loop Kinetics in EpCAM.

Serena H Chen¹, David R Bell²

¹Oak Ridge National Laboratory, Computational Sciences and Engineering Division, Oak Ridge, TN 37830, USA.

Life (Basel, Switzerland)

|September 28, 2021

Summary

The Epithelial cell-activating molecule (EpCAM) TY loop remains dynamic across species. Fish EpCAM shows unique binding patterns compared to other organisms, influenced by its TY loop sequence.

Keywords:

EpCAM evolution kinetics molecular dynamics simulation thyroglobulin loop

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Area of Science:

Biochemistry
Molecular Biology
Structural Biology

Background:

Epithelial cell-activating molecule (EpCAM) is a crucial cancer biomarker and therapeutic target due to its overexpression in epithelial cancers.
EpCAM is a type I transmembrane protein that dimerizes via its extracellular thyroglobulin type-1A-like domain (TYD).
The EpCAM TY loop within the TYD exhibits dynamic behavior and reversible binding in its monomeric state.

Purpose of the Study:

To investigate the evolutionary conservation and species-specific dynamics of the EpCAM TY loop.
To identify potential binding sites for the EpCAM TY loop beyond the TYD.
To understand the structural basis for differential EpCAM binding patterns across species.

Main Methods:

Utilized over 17 microseconds of all-atom molecular dynamics simulations.
Analyzed EpCAM TY loop kinetics in five species: human, mouse, chicken, frog, and fish.
Calculated dissociation rate constants to determine binding affinities.

Main Results:

The EpCAM TY loop demonstrates conserved dynamic behavior across all studied species.
A second binding site for the TY loop was identified in the C-terminal domain (CTD).
Fish EpCAM exhibits distinct binding kinetics, with comparable affinity for both TYD and CTD sites, unlike other species that preferentially bind the TYD.

Conclusions:

The EpCAM TY loop's structural dynamics are evolutionarily conserved.
The sequence of the TY loop significantly influences its dynamic behavior and binding preferences.
Findings offer insights into EpCAM's structural dynamics and physiological roles, with implications for cancer therapy.