Related Experiment Video
Updated: Mar 12, 2026
06:56
Generating a Fractal Microstructure of Laminin-111 to Signal to Cells
Published on: September 28, 2020
1.4K
Cross-linking reveals laminin coiled-coil architecture
Gad Armony1, Etai Jacob1,2, Toot Moran1
1Department of Structural Biology, Weizmann Institute of Science, Rehovot 7610001, Israel.
Summary
Researchers revised the laminin quaternary structure using cross-linking and mass spectrometry. This study clarifies the coiled-coil assembly and subunit arrangement of this crucial extracellular matrix protein.
Area of Science:
- Biochemistry
- Structural Biology
- Extracellular Matrix Research
Background:
- Laminin is a large, heterotrimeric protein essential for tissue development and maintenance.
- Its complex, flexible structure hinders high-resolution structural determination via traditional methods like crystallization or electron microscopy.
Purpose of the Study:
- To investigate the quaternary structure of laminin, focusing on its coiled-coil assembly.
- To clarify the subunit order and register within the laminin trimer.
Main Methods:
- Utilized chemical cross-linking coupled with mass spectrometry (MS).
- Employed computational methods for data evaluation.
- Focused on the ∼750-Å coiled coil region responsible for trimer assembly.
Main Results:
- Supported a revised model for the subunit order in laminin schematics.
- Provided information on subunit register within the coiled coil.
- Identified cross-links to downstream domains, offering insights into self-assembly.
Conclusions:
- The cross-linking MS approach is effective for studying large, flexible protein complexes like laminin.
- Findings advance the understanding of laminin's structural organization and self-assembly mechanisms.
- This structural information is vital for understanding interactions with other extracellular matrix and cell surface proteins.
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