A Non-Intuitive Design of a Cyclic Decapeptide Library with Unique Backbone Structural Features

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An analysis of hydrogen bonding patterns of cyclic decapeptide (CDP) β-sheet structures has resulted in a 'non-intuitive' design of cyclic decapeptides wherein their β-turns and residue positions can be fixed by choosing 2 of the 10 residues, i.e. positions i and i+4, to be Prolines or N-substituted residues. This sequence relationship between the two Pro or N-substituted residues is shown to uniquely define the conformation of the CDP. Furthermore, this design of the 2 β-turn, β-sheet CDP structure is expected to be characterised by residues disposed in an exclusive fashion in which four residues are on one side of the ring, two on the other and the four corner residues in the β-turn are in the plane of the ring. This opens up the possibility of fine-tuning the four residues facing one way and / or the two residues facing the other way such that a library containing a myriad of chemically diverse systems could be obtained. The design process along with the molecular modelling of specific CDP's and the building of a CDP library are discussed in detail.

Keywords: backbone conformation; beta-sheet; beta-turns; cyclic decapeptide; hydrogen bonds; library design; peptide library

Document Type: Review Article

DOI: http://dx.doi.org/10.2174/0929866033478618

Affiliations: Unilever Research, Portsunlight Laboratory, Wirral, U.K. CH63 3JW

Publication date: December 1, 2003

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.
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