Search results
Results from the WOW.Com Content Network
Hydroxyproline is a major component of the protein collagen, [3] comprising roughly 13.5% of mammalian collagen. Hydroxyproline and proline play key roles for collagen stability. [ 4 ] They permit the sharp twisting of the collagen helix. [ 5 ]
Extensin hydroxyproline is uniquely glycosylated with short chains of L-arabinose [8] that further rigidify [9] and increase hydrophilicity. Generally the serine has a single galactose attached. Generally the serine has a single galactose attached.
In nature, proline, hydroxyproline, pipecolic acid and sarcosine are well-known secondary amino acids. Proline is the only proteinogenic secondary amino acids. Other secondary amino acids are non-proteinogenic amino acids. In protein, hydroxyproline is incorporated into protein by hydroxylation of proline.
"4-Hydroxyproline, or hydroxyproline (C5H9O3N), is an uncommon amino acid" "Hydroxyproline is a major component of the protein collagen" and under Collagen: "Collagen is the main protein of connective tissue in animals and the most abundant protein in mammals,[1] making up about 25% of the whole-body protein content."
Prolidase deficiency generally becomes evident during infancy, but initial symptoms can first manifest anytime from birth to young adulthood. The condition results in a very diverse set symptoms, [3] the severity of which can vary significantly between patients, depending on the degree to which prolidase activity is hampered by the individual underlying mutation(s) in each case.
In 1954, Ramachandran & Kartha (13, 14) advanced a structure for the collagen triple helix on the basis of fiber diffraction data. It consists of a triple helix made of the repetitious amino acid sequence glycine-X-Y, where X and Y are frequently proline or hydroxyproline. [2] [3] Collagen folded into a triple helix is known as tropocollagen.
Proline (symbol Pro or P) [4] is an organic acid classed as a proteinogenic amino acid (used in the biosynthesis of proteins), although it does not contain the amino group-NH 2 but is rather a secondary amine.
The systematic name of this enzyme class is 4-hydroxyproline 2-epimerase. Other names in common use include hydroxyproline epimerase , hydroxyproline 2-epimerase , and L-hydroxyproline epimerase . This enzyme participates in arginine and proline metabolism .