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Updated: May 29, 2026

Studies of Chaperone-Cochaperone Interactions using Homogenous Bead-Based Assay

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Published on: July 21, 2021

Molecular chaperone function for myocilin.

Ann Marie Anderssohn¹, Kalani Cox, Kevin O'Malley

¹Casey Eye Institute, Oregon Health & Science University, Portland, Oregon 97239, USA.

Investigative Ophthalmology & Visual Science

|August 30, 2011

Summary

This summary is machine-generated.

Myocilin, a stress response protein, acts as a molecular chaperone. It protects key proteins like citrate synthase and GAPDH from heat-induced damage and aggregation, suggesting a vital cellular protective role.

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Published on: September 2, 2019

Area of Science:

Cellular Biology
Protein Biochemistry

Background:

Myocilin is recognized as a stress response protein.
Its precise molecular functions remain largely uncharacterized.

Purpose of the Study:

To investigate the potential of myocilin as a general molecular chaperone.
To determine if myocilin exhibits protective effects against protein thermal inactivation and aggregation.

Main Methods:

Myocilin was purified from porcine trabecular meshwork (TM) cell culture.
Protective assays were performed using citrate synthase, glyceraldehyde-3-phosphate dehydrogenase (GAPDH), and DrdI.
Thermal inactivation and aggregation were monitored using enzyme activity assays and light scattering.
Myocilin induction under stress conditions was assessed in TM cells.

Main Results:

Extracellular myocilin levels increased in TM cells following mechanical stretch, heat shock, TNFα, or IL-1α.
Myocilin concentration-dependently protected citrate synthase and GAPDH from thermal inactivation.
Myocilin significantly reduced citrate synthase thermal aggregation.
Myocilin demonstrated superior protection of DrdI compared to bovine serum albumin.

Conclusions:

Myocilin is induced by various cellular stresses.
Myocilin exhibits general molecular chaperone activity, protecting proteins from thermal inactivation.
Myocilin also inhibits protein thermal aggregation, supporting its role as a molecular chaperone.