1h0g
From Proteopedia
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==Overview== | ==Overview== | ||
| - | Over the past years, family 18 chitinases have been validated as potential | + | Over the past years, family 18 chitinases have been validated as potential targets for the design of drugs against human pathogens that contain or interact with chitin during their normal life cycles. Thus far, only one potent chitinase inhibitor has been described in detail, the pseudotrisaccharide allosamidin. Recently, however, two potent natural-product cyclopentapeptide chitinase inhibitors, argifin and argadin, were reported. Here, we describe high-resolution crystal structures that reveal the details of the interactions of these cyclopeptides with a family 18 chitinase. The structures are examples of complexes of a carbohydrate-processing enzyme with high-affinity peptide-based inhibitors and show in detail how the peptide backbone and side chains mimic the interactions of the enzyme with chitooligosaccharides. Together with enzymological characterization, the structures explain why argadin shows an order of magnitude stronger inhibition than allosamidin, whereas argifin shows weaker inhibition. The peptides bind to the chitinase in remarkably different ways, which may explain the differences in inhibition constants. The two complexes provide a basis for structure-based design of potent chitinase inhibitors, accessible by standard peptide chemistry. |
==About this Structure== | ==About this Structure== | ||
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[[Category: Protein complex]] | [[Category: Protein complex]] | ||
[[Category: Serratia marcescens]] | [[Category: Serratia marcescens]] | ||
| - | [[Category: Aalten, D | + | [[Category: Aalten, D M.F Van.]] |
[[Category: Arai, N.]] | [[Category: Arai, N.]] | ||
| - | [[Category: Eijsink, V | + | [[Category: Eijsink, V G.H.]] |
| - | [[Category: Houston, D | + | [[Category: Houston, D R.]] |
[[Category: Omura, S.]] | [[Category: Omura, S.]] | ||
| - | [[Category: Peter, M | + | [[Category: Peter, M G.]] |
[[Category: Shiomi, K.]] | [[Category: Shiomi, K.]] | ||
[[Category: Synstad, B.]] | [[Category: Synstad, B.]] | ||
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[[Category: inhibitor]] | [[Category: inhibitor]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:56:04 2008'' |
Revision as of 10:56, 21 February 2008
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COMPLEX OF A CHITINASE WITH THE NATURAL PRODUCT CYCLOPENTAPEPTIDE ARGADIN FROM CLONOSTACHYS
Overview
Over the past years, family 18 chitinases have been validated as potential targets for the design of drugs against human pathogens that contain or interact with chitin during their normal life cycles. Thus far, only one potent chitinase inhibitor has been described in detail, the pseudotrisaccharide allosamidin. Recently, however, two potent natural-product cyclopentapeptide chitinase inhibitors, argifin and argadin, were reported. Here, we describe high-resolution crystal structures that reveal the details of the interactions of these cyclopeptides with a family 18 chitinase. The structures are examples of complexes of a carbohydrate-processing enzyme with high-affinity peptide-based inhibitors and show in detail how the peptide backbone and side chains mimic the interactions of the enzyme with chitooligosaccharides. Together with enzymological characterization, the structures explain why argadin shows an order of magnitude stronger inhibition than allosamidin, whereas argifin shows weaker inhibition. The peptides bind to the chitinase in remarkably different ways, which may explain the differences in inhibition constants. The two complexes provide a basis for structure-based design of potent chitinase inhibitors, accessible by standard peptide chemistry.
About this Structure
1H0G is a Protein complex structure of sequences from Serratia marcescens with and as ligands. Active as Hydrolase, with EC number 3.2.1.14. Known structural/functional Site: . Full crystallographic information is available from OCA.
Reference
High-resolution structures of a chitinase complexed with natural product cyclopentapeptide inhibitors: mimicry of carbohydrate substrate., Houston DR, Shiomi K, Arai N, Omura S, Peter MG, Turberg A, Synstad B, Eijsink VG, van Aalten DM, Proc Natl Acad Sci U S A. 2002 Jul 9;99(14):9127-32. Epub 2002 Jul 1. PMID:12093900
Page seeded by OCA on Thu Feb 21 12:56:04 2008
Categories: Hydrolase | Protein complex | Serratia marcescens | Aalten, D M.F Van. | Arai, N. | Eijsink, V G.H. | Houston, D R. | Omura, S. | Peter, M G. | Shiomi, K. | Synstad, B. | Turberg, A. | ACE | GOL | Argadin | Chitin degradation | Inhibitor
