CAS 149128-48-3: L-Serine, L-lysyl-L-threonyl-L-threonyl-L-lysyl-

Procollagen type I (212-216) H-Lys-Thr-Thr-Lys-Ser-OH is a tetrapeptide that is the most abundant component of human skin. It has been shown to have biological properties and can be synthesized in vitro. Procollagen type I (212-216) H-Lys-Thr-Thr-Lys-Ser-OH has an absorption maximum at 265 nm, which makes it suitable for use in uv protection creams. It also has a high chemical stability and can be stored for up to two years without degradation. Procollagen type I (212-216) H-Lys-Thr-Thr-Lys-Ser-OH is used as a substrate in cell culture to study protein synthesis and transcription, or polymerase chain reaction, technique. This peptide also inhibits the activity of proteases such as trypsin and chymotrypsin, making

A subfragment of the carboxy-terminal propeptide of type I collagen (residues 197-241) was shown to stimulate extracellular matrix biosynthesis in fibroblasts. The pentapeptide KTTKS has been found to be the minimum sequence necessary for this potent stimulation of collagen and fibronectin production in a variety of mesenchymal cells.

Pentapeptide-4 is a matrikine utilized in anti-wrinkle cosmetics.