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Topic: Hydroxylysine

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	AllRefer.com - glycoprotein (Biochemistry) - Encyclopedia
		Combinations of up to seven of the many different sugar molecules known to occur in nature comprise the saccharide portions of mammalian glycoproteins: glucose, glucosamine, galactose, galactosamine, mannose, fucose, and sialic acid (a derivative of glucosamine).
		The linkage between the oligosaccharide and the protein occurs by formation of a chemical bond to only one of four protein amino acids: asparagine, hydroxylysine, serine, or threonine.
		Solutions of glycoproteins usually exhibit high viscosity, an observation explaining the highly viscous character of egg white, which is composed largely of the glycoprotein ovalbumin.
	reference.allrefer.com /encyclopedia/G/glycopro.html (348 words)

	Learn more about Collagen in the online encyclopedia. (Site not responding. Last check: 2007-10-22)
		Collagen also fills out the cornea where it is present in crystalline form.
		It contains a lot of glycine and proline, as well as two amino acids that are not inserted directly by ribosomes: hydroxyproline and hydroxylysine, the former as a rather large percentage of the total amino acids.
		They are changed from proline and lysine in enzymatic processes, for which vitamin C is required.
	www.onlineencyclopedia.org /c/co/collagen.html (308 words)

	Articles - Collagen (Site not responding. Last check: 2007-10-22)
		It contains large amounts of glycine and proline, as well as two amino acids that are not inserted directly by ribosomes â€“ hydroxyproline and hydroxylysine â€“ the former composing a rather large percentage of the total amino acids.
		They are derivatised from proline and lysine in enzymatic processes of post translational modification, for which vitamin C is required.
		Hydroxylysine and hydroxyproline play important roles in the stabilisation of the tropocollagen globular structure as well as the final fibre shaped structure by forming covalent bonds.
	www.wicso.com /articles/Collagen (485 words)

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