Amino Acid Composition of Some Calcified Proteins

Abstract

Amino-acid analysis shows that the proteins from two calcified tissues, enamel and snail shell, are related to collagen in that they also contain hydroxylysine . The presence of hydroxyproline is suggested but not confirmed. This evidence, together with other recent findings, suggests that hydroxylysine may have an important role in the calcification of each of these otherwise diverse proteins.