| Title | Design of proteins using rigid organic macrocycles as scaffolds |
| Publication Type | Journal Article |
| Year of Publication | 1999 |
| Authors | Causton, AS, Sherman, JC |
| Journal | Bioorganic & Medicinal Chemistry |
| Volume | 7 |
| Pagination | 23-27 |
| Date Published | Jan |
| Type of Article | Article |
| ISBN Number | 0968-0896 |
| Keywords | 4-HELIX BUNDLE PROTEIN, ASSEMBLED SYNTHETIC PROTEINS, CHEMOSELECTIVE LIGATION, CONSTRUCTION, CROSS-LINKING, CRYSTAL-STRUCTURE, cyclotribenzylene, de novo protein, DE-NOVO PROTEINS, HELICAL BUNDLES, HELICAL PROTEIN, PEPTIDE, TASP, TEMPLATE |
| Abstract | We have designed and synthesized new three-helix template-assembled synthetic proteins (TASPs) 1a-c. The template was the rigid cyclotribenzylene (CTB) macrocycle 2, which has C-3 symmetry. Thiol moieties on the CTB template were used to link cysteine-containing peptide strands 3a-c via disulfide bonds. With designed peptide strands of 15 and 18 residues in length, the structure of TASPs 1a-c were determined to be helical in water according to circular dichroism (CD) spectroscopy. The helicities of TASPs la-e were unchanged over large ranges of pH (2-12) and salt concentrations (0-2 M KCl). TASPs 1a-c were also extremely resistant to chemical denaturants: it requires a guanidine hydrochloride (GnHCl) concentration of 7.4 M for TASPs 1a-c to lose 50% of their helicity. The major force for stabilization of TASPs 1a-c is the hydrophobic bundling of the helices. (C) 1999 Elsevier Science Ltd. All rights reserved. |
| URL | <Go to ISI>://000078990600004 |
