title: Type-I trimer and type-I collagen in neutral-salt-soluble lathyritic-rat dentine.
abstract: Triple-helical collagen molecules have been obtained from EDTA-demineralized lathyritic rat incisors by neutral buffer extraction. Component alpha chains, isolated by sequential ion-exchange and gel-filtration chromatography, were shown to be alpha1 I and alpha2 chains by cyanogen bromide peptide analysis. The alpha1 I:alpha2 chain ratio was approximately 3:1, which is greater than expected for type I collagen. The excess of alpha1 I chains over that required for type I collagen was due to the presence of type I trimer molecules. Fractional salt precipitation separated type I collagen from type I trimer. It is not known at present if type I trimer synthesis also occurs in normal rat tissues.
mesh_terms: D000818:Animals; D003094:Collagen / Q000302:isolation & purification / Q000378:metabolism; D003804:Dentin / Q000378:metabolism*; D007842:Lathyrism / Q000378:metabolism*; D046911:Macromolecular Substances; D008297:Male; D008970:Molecular Weight; D010446:Peptide Fragments / Q000032:analysis; D051381:Rats; D012492:Salts; D012995:Solubility
chemical_list: D046911:Macromolecular Substances; D010446:Peptide Fragments; D012492:Salts; D003094:Collagen