The extensin family is a diverse group of hydroxyproline-rich glycoproteins located in the cell wall and characterized by repetitive peptide motifs glycosylated to various degrees. The origin of this diversity and its relationship to function led us earlier to compare extensins of the two major groups of angiosperms from which we concluded that the highly glycosylated Ser-Hyp(4) motif was chara...

We have observed that the rate of folding of the enzymatically hydroxylated form of poly(G1yPro-Pro) into the triple-helical conformation is considerably higher than that of the unhydroxylated polypeptide [R. K. Chopra and V. S. Ananthanarayanan (1982) Proc. Nutl. Acud. Sci. USA 79, 7180-71841. In this study, we examine a plausible kinetic pathway for triple-helix formation by selecting peptide...

Background: It was well known that inhibitory effect of corticosteroids on cutaneous wound healing antagonized by the use of topical tretinoin and systemic vitamin A. However, the exact mechanism of this antagonistic interaction is not yet fully known. The aim of this study was to investigate the effects of topical tretinoin and adapalene application on tissue hydroxyproline content in corticos...

Until recently, little evidence existed for the stepwise breakdown by mammalian enzymes of hydroxyproline, an important constituent of total animal protein. In past years, several investigators (4-6) have determined the labeled amino acids formed when nn-2-C14-hydroxyproline is administered to rats. The earliest studies performed in vitro, however, indicated that Alpyrroline-3-hydroxy-5-carboxy...

OBJECTIVE To assess, in myocardium specimens obtained from necropsies, the correlation between the concentration of hydroxyproline, measured with the photocolorimetric method, and the intensity of fibrosis, determined with the morphometric method. METHODS Left ventricle myocardium samples were obtained from 45 patients who had undergone necropsy, some of them with a variety of cardiopathies a...

Collagen quantification has long been relevant to biomedical research and clinical practice to characterize tissues and determine disease states. The hydroxyproline assay, while a broadly employed method of quantifying collagen, uses perchloric acid to dissolve Ehrlich's reagent. Since perchloric acid poses occupational safety hazards and high costs, in this study, a new hydroxyproline assay wa...