title: Facile and efficient assembly of collagen-like triple helices on a TRIS scaffold.
abstract: The TRIS scaffold, Boc-beta-Ala-TRIS-(OH)3, was utilized to assemble triple helices composed of the Gly-Nleu-Pro sequence (Nleu denotes N-isobutylglycine). The scaffold assembly can be achieved efficiently through direct coupling between long peptide chains and the TRIS scaffold using DEPBT, a recently developed peptide coupling reagent. CD spectroscopy and thermal denaturation studies demonstrated that Boc-beta-Ala-TRIS-[(Gly-Nleu-Pro)n-OMe]3 exhibits triple helicity in H2O when n equals 5, 6, and 8, while the shorter analogs (where n=1 and 4) do not. TRIS-assembled structures possess several advantages over the KTA- and TREN-assembled structures previously reported from our laboratory (where KTA and TREN denotes cis-1,3,5-trimethyl cyclohexane-1,3,5-tricarboxylic acid and tris(2-aminoethyl)amine, respectively). The protecting groups on the scaffold and at the C-terminus of the TRIS-assembled peptides can be readily removed to synthesize collagen mimetic dendrimers and metal-complexing collagen-like peptides respectively, both of which can lead to further enhanced thermal stability.
authors: The Molecular Imaging Program at Stanford (MIPS), Department of Radiology and Bio-X Program, Stanford University School of Medicine, CA, USA. wcai@stanford.edu
authors: Weibo
authors: W
authors: Cai
authors: Dustin
authors: D
authors: Wong
authors: Garth A
authors: GA
authors: Kinberger
authors: Sen Wai
authors: SW
authors: Kwok
authors: Joseph P
authors: JP
authors: Taulane
authors: Murray
authors: M
authors: Goodman
mesh_terms: D000595:Amino Acid Sequence; D040761:Biomimetic Materials / Q000138:chemical synthesis; D002942:Circular Dichroism; D003094:Collagen / Q000138:chemical synthesis* / Q000737:chemistry; D003432:Cross-Linking Reagents / Q000737:chemistry; D006358:Hot Temperature; D011487:Protein Conformation; D011489:Protein Denaturation; D014867:Water
chemical_list: D003432:Cross-Linking Reagents; D014867:Water; D003094:Collagen