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. 2002 Nov 15;368(Pt 1):23–27. doi: 10.1042/BJ20021034

The cyclic dipeptide CI-4 [cyclo-(l-Arg-d-Pro)] inhibits family 18 chitinases by structural mimicry of a reaction intermediate.

Douglas R Houston 1, Ian Eggleston 1, Bjørnar Synstad 1, Vincent G H Eijsink 1, Daan M F van Aalten 1
PMCID: PMC1222990  PMID: 12323074

Abstract

Family 18 chitinases are attractive targets for the development of new inhibitors with chemotherapeutic potential against fungi, insects and protozoan/nematodal parasites. Although several inhibitors have been identified, these are based on complex chemistry, which hampers iterative structure-based optimization. Here we report the details of chitinase inhibition by the natural product peptide CI-4 [ cyclo -(L-Arg-D-Pro)], which possesses activity against the human pathogenic fungus Candida albicans, and describe a 1.7 A (0.17 nm) crystal structure of CI-4 in complex with the enzyme. The structure reveals that the cyclic dipeptide inhibits chitinases by structurally mimicking a reaction intermediate, and could, on the basis of its accessible chemistry, be a candidate for further optimization.

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Selected References

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