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Fibrous proteins are either long and narrow proteins or assemble to form long and thin structures. They contain repetitive units and usually consist of either alpha helices or beta sheets and, in rare cases, a mix of both. The amino acids in the primary structure often consist of repeating amino acid sequences. The role of fibrous proteins is primarily structural. Many are located in the extracellular matrix and are present in connective tissues to impart strength and joint mobility. They are...

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Related Experiment Video

Updated: Jul 19, 2026

In vitro Synthesis of Native, Fibrous Long Spacing and Segmental Long Spacing Collagen

In vitro Synthesis of Native, Fibrous Long Spacing and Segmental Long Spacing Collagen

Published on: September 20, 2012

Collagen fibrils: nanoscale ropes.

Laurent Bozec¹, Gert van der Heijden, Michael Horton

¹Bone and Mineral Centre, Department of Medicine, and Department of Civil and Environmental Engineering, University College London, London, England. lbozec@ucl.ac.uk

Biophysical Journal

|October 10, 2006

Summary

Collagen fibrils form a spiral structure, unlike the previously accepted staggered model. This rope-like arrangement offers new insights into collagen

Area of Science:

Biophysics
Materials Science
Biomolecular Engineering

Background:

The long-standing model of collagen fibril formation involves staggered repeats of individual molecules.
This established model has limitations in explaining observed structural and functional aspects of collagen fibrils.

Purpose of the Study:

To investigate an alternative structural model for collagen fibrils.
To address unresolved questions regarding collagen fibril structure and function.

Main Methods:

Utilized atomic force microscopy to visualize the structure of tendon collagen fibrils.
Employed elastic rod theory to model and confirm the proposed spiral arrangement.

Main Results:

Atomic force microscopy revealed that tendon collagen fibrils are composed of subcomponents arranged in a spiral.

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This spiral disposition is analogous to the structure of macroscale ropes.

Modeling and theoretical confirmation supported the spiral arrangement hypothesis.

Conclusions:

The study proposes a novel spiral model for collagen fibril structure, challenging the traditional staggered model.
This new understanding has significant implications for tissue engineering scaffold design.
It also aids in understanding the pathogenesis of bone and tendon diseases and in conserving museum artifacts.