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[Electron microscopic study of isolated proteoglycans].

S M Bychkov, E V Vinogradova, I N Mikhailov

Biulleten' Eksperimental'Noi Biologii I Meditsiny

|February 1, 1979

Summary

Electron microscopy revealed distinct structural differences between protein-chondroitin-keratin sulphate (PCKS) and hyaluronic acid (HUA) proteoglycans. These cartilage and vitreous body components form unique networks and complexes, aiding in their differentiation.

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Area of Science:

Biochemistry
Structural Biology
Electron Microscopy

Background:

Proteoglycans are crucial macromolecules in connective tissues.
Understanding the structural organization of different proteoglycans is essential for elucidating their biological functions.

Purpose of the Study:

To investigate and differentiate the structural organization of protein-chondroitin-keratin sulphate (PCKS) and hyaluronic acid (HUA) proteoglycans.
To analyze the macromolecular organization of these proteoglycans using electron microscopy.

Main Methods:

Chemically isolated preparations of PCKS from hyaline cartilage and HUA from vitreous body and umbilicus.
Electron microscopy of proteoglycan films, with and without cytochrome c.
Contrast enhancement using uranyl acetate.

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Main Results:

PCKS and HUA exhibited distinct granular structures and differing organizational patterns in films without cytochrome c.
In the presence of cytochrome c, proteoglycans formed a finely-filamentous-cellular network, revealing clear macromolecular differentiation.
A mixture of PCKS and HUA formed complexes through noncovalent interactions.
Uranyl acetate provided effective contrast, particularly for PCKS.

Conclusions:

Electron microscopy effectively differentiates the structural and macromolecular organization of PCKS and HUA proteoglycans.
Noncovalent interactions play a role in the complex formation between different proteoglycans.
Cytochrome c and uranyl acetate are valuable tools for visualizing proteoglycan structures.