The Nature, Quantity, and Mode of Attachment of Hexoses in Ichthyocol.
نویسندگان
چکیده
Small amounts of components which react as hexoses are present in highly purified collagens. Grassmann et al. (1) have shown that the hexose units are probably attached to the protein backbone in collagen through a glycosidic linkage. From acid hydrolysates of collagens of a number of species, Gross, Dumsha, and Glazer (2) isolated n-glucose and n-galactose. Certain of the collagens also contained traces of other hexoses, pentoses, and amino sugars. These authors showed that the total carbohydrate content of collagens varied with species, being 0.6 to 2% in vertebrate, and 5 to 15.5% in invertebrate, collagens. Since hexoses have been considered as possible participants in ester cross-linkages of collagen (3, 4), precise information is required concerning their amounts and mode of linkage in the protein. In this communication evidence is presented that ichthyocol contains 1.4 -I: 0.1 residues of glucose and 2.1 f 0.2 residues of galactose per 1000 amino acid residues, corresponding to 5 residues of glucose and 7 of galactose per tropocollagen molecule of molecular weight 320,000. Evidence is also presented which suggests that the hexoses are bound through their C-l positions in covalent linkages to the protein.
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ورودعنوان ژورنال:
- The Journal of biological chemistry
دوره 238 شماره
صفحات -
تاریخ انتشار 1963