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Collagen packing in the dogfish egg case wall
1The Blackett Laboratory, Imperial College of Science, Technology and Medicine, London, SW7 2BZ, United Kingdom.
Journal of Structural Biology
|September 2, 1998
Summary
The dogfish egg case collagen forms a robust 3D network, providing protection and filtration for the embryo. New electron microscopy reveals detailed structure, aiding understanding of this unique collagen and related types.
Area of Science:
- Biochemistry
- Structural Biology
- Developmental Biology
Background:
- The dogfish (Scyliorhinus canicula) egg case is composed of collagen, forming a highly resistant capsule.
- This capsule is essential for protecting and filtering the developing embryo.
Purpose of the Study:
- To elucidate the detailed three-dimensional structure of the dogfish egg case collagen network.
- To propose a molecular packing arrangement consistent with new structural data.
Main Methods:
- Obtaining electron micrographs of metal-shadowed, deep-etched replicas of the egg case.
- Analyzing micrographs using computer-based Fourier methods.
Main Results:
- Detailed three-dimensional structural information of the egg case collagen network was obtained, surpassing previous data from plastic sections.
- A molecular packing arrangement model was proposed based on the new structural insights.
Conclusions:
- The unique, shorter collagen (45 nm) in the dogfish egg case forms a protective and filtering capsule.
- Understanding this collagen's structure offers insights into other collagen types with similar protective or filtering functions.