Takahashi I, Kuroiwa S, Lindfors HE, Ndamba LA, Hiruma Y, Yajima T, Okishio N, Ubbink M, Hirota S. Modulation of protein-ligand interactions by photocleavage of a cyclic peptide using phosphatidylinositol 3-kinase SH3 domain as model system.
J Pept Sci 2009;
15:411-6. [PMID:
19378350 DOI:
10.1002/psc.1132]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
To photomodulate the interaction of the phosphatidylinositol 3-kinase SH3 domain with a peptide ligand, a cyclic peptide (cyclic-1) with a photolabile side chain-to-side chain linker was synthesized. The conformation of cyclic-1 differs from that of the parent linear peptide, but becomes identical by UV-irradiation. Accordingly, the binding affinity of cyclic-1 to the SH3 domain increased upon conversion of the cyclic to a linear flexible structure by irradiation (K(d): 3.4 +/- 1.7 and 0.9 +/- 0.3 mM, respectively). These results confirm the usefulness of a photocleavable peptide for photocontrol of peptide-protein interactions.
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