Related Experiment Video
Updated: Feb 26, 2026
10:13
Micropatterned Surfaces to Study Hyaluronic Acid Interactions with Cancer Cells
Published on: December 22, 2010
15.6K
Atomistic fingerprint of hyaluronan-CD44 binding
Joni Vuorio1,2, Ilpo Vattulainen1,2,3, Hector Martinez-Seara1,4
1Department of Physics, Tampere University of Technology, Tampere, Finland.
Plos Computational Biology
|July 18, 2017
Summary
Hyaluronan binding to CD44 receptor involves three distinct modes, not just one. These modes explain previous research discrepancies and influence CD44 aggregation, a key signaling mechanism.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Hyaluronan (HA) is a polysaccharide crucial for cell signaling, interacting with receptors like CD44.
- CD44-HA interactions mediate cell-cell adhesion and are implicated in signaling pathways.
- Previous studies showed conflicting data on CD44-HA binding sites and modes.
Purpose of the Study:
- To investigate the binding modes of hyaluronan to the CD44 receptor.
- To reconcile discrepancies between previous experimental findings on CD44-HA interactions.
- To elucidate the role of different binding modes in CD44 function and signaling.
Main Methods:
- Atomistic molecular dynamics simulations were employed.
- Simulations analyzed the interactions between hyaluronan and the CD44 binding domain.
- Unbiased simulations identified frequently observed binding configurations.
Main Results:
- Hyaluronan binds CD44 through three distinct topographical binding modes.
- The crystallographic binding mode is the most stable.
- Two additional metastable binding modes were identified and frequently observed.
- Weaker binding modes facilitate 1D diffusion of CD44 along hyaluronan.
Conclusions:
- The three binding modes define a unique interaction fingerprint for CD44-HA.
- Metastable binding modes explain previous experimental disagreements.
- CD44 diffusion along HA influences aggregation kinetics, potentially impacting CD44-mediated signaling.
