The paradox of conformational constraint in the design of Cbl(TKB)-binding peptides.
Kumar, E.A., Chen, Q., Kizhake, S., Kolar, C., Kang, M., Chang, C.E., Borgstahl, G.E., Natarajan, A.(2013) Sci Rep 3: 1639-1639
- PubMed: 23572190 
- DOI: 10.1038/srep01639
- Primary Citation of Related Structures:  
4GPL - PubMed Abstract: 
Solving the crystal structure of Cbl(TKB) in complex with a pentapeptide, pYTPEP, revealed that the PEP region adopted a poly-L-proline type II (PPII) helix. An unnatural amino acid termed a proline-templated glutamic acid (ptE) that constrained both the backbone and sidechain to the bound conformation was synthesized and incorporated into the pYTPXP peptide ...