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Binding crevice for TT-232 in a homology model of type 1 somatostatin receptor.

Somatostatin receptor type 1 was modelled based on the atomic structure of bovine rhodopsin. Possible ways of binding interaction between somatostatin receptor type 1 and TT-232, a cycloheptapeptide analogue of somatostatin with broad therapeutic potential, were analysed by molecular docking. The twelve TT-232 conformations, obtained by NMR measurements in H(2)O-D(2)O mixture, were similar, disclosing a consensus backbone conformation. Several residues interacting with TT-232, such as Val133, Asp137 (helix 3), Arg197 (helix 4), Phe287, Gln291, Asn294 (helix 6), Ser305, and Tyr313 (helix 7), were found. In accordance, in vitro binding experiments indicated high-affinity binding of TT-232 to (125)I labelled somatostatin sites in brain membranes. The single binding crevice obtained by docking may allow the design and discovery of new peptidomimetics of TT-232 in the future.[1]

References

  1. Binding crevice for TT-232 in a homology model of type 1 somatostatin receptor. Simon, A., Czajlik, A., Perczel, A., Kéri, G., Nyikos, L., Emri, Z., Kardos, J. Biochem. Biophys. Res. Commun. (2004) [Pubmed]
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