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Rotary shadowing of collagen monomers, oligomers, and fibrils during tendon fibrillogenesis

R Fleischmajer, JS Perlish and T Faraggiana

Department of Dermatology, Mount Sinai School of Medicine, New York, New York 10029.

Collagen monomers, oligomers, and fibrillar structures were isolated from chick tendons at various stages of development and studied by rotary shadowing. Monomers of Type I collagen, solubilized in 0.15 M NaCl solutions, were mostly present as collagen, pN-collagen, and pC- collagen with few procollagen molecules. They did not form polymers, nor were they associated with a carrier. Dimers of fibrillar collagen molecules were arranged in a 4-D stagger, suggesting that this was the preferred molecular interaction for the initiation of collagen fibrillogenesis. Type XII collagen molecules were mostly free, but some were attached by their central globular domain to one end of free fibrillar collagen molecules. Tenascin and Type VI collagen were also identified. The fibril populations consisted of collagen and beaded structures. These fibrils consisted of beads (globular domains) about 23 nm in diameter, separated by a period about 27 nm in length. Beads were linked by filamentous structures. These beaded fibrils probably represent the microfibrils of elastin.

Volume 39, Issue 1, pp. 51-58, 01/01/1991
Copyright © 1991 by The Histochemical Society


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