1n6d
From Proteopedia
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| - | [[Image:1n6d.gif|left|200px]] | + | [[Image:1n6d.gif|left|200px]] |
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| - | '''Tricorn protease in complex with tetrapeptide chloromethyl ketone derivative''' | + | {{Structure |
| + | |PDB= 1n6d |SIZE=350|CAPTION= <scene name='initialview01'>1n6d</scene>, resolution 2.8Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=D10:DECANE'>D10</scene> and <scene name='pdbligand=CHM:1,3-DICHLORO-PROPAN-2-ONE'>CHM</scene> | ||
| + | |ACTIVITY= | ||
| + | |GENE= | ||
| + | }} | ||
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| + | '''Tricorn protease in complex with tetrapeptide chloromethyl ketone derivative''' | ||
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==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1N6D is a [ | + | 1N6D is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Thermoplasma_acidophilum Thermoplasma acidophilum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1N6D OCA]. |
==Reference== | ==Reference== | ||
| - | Navigation inside a protease: substrate selection and product exit in the tricorn protease from Thermoplasma acidophilum., Kim JS, Groll M, Musiol HJ, Behrendt R, Kaiser M, Moroder L, Huber R, Brandstetter H, J Mol Biol. 2002 Dec 13;324(5):1041-50. PMID:[http:// | + | Navigation inside a protease: substrate selection and product exit in the tricorn protease from Thermoplasma acidophilum., Kim JS, Groll M, Musiol HJ, Behrendt R, Kaiser M, Moroder L, Huber R, Brandstetter H, J Mol Biol. 2002 Dec 13;324(5):1041-50. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12470958 12470958] |
[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Thermoplasma acidophilum]] | [[Category: Thermoplasma acidophilum]] | ||
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[[Category: tricorn protease]] | [[Category: tricorn protease]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 12:52:43 2008'' |
Revision as of 10:52, 20 March 2008
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| , resolution 2.8Å | |||||||
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| Ligands: | and | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Tricorn protease in complex with tetrapeptide chloromethyl ketone derivative
Overview
The proposed pathway and mechanism of substrate entry and product egress in the hexameric D3 symmetric tricorn protease from Thermoplasma acidophilum were explored by crystallographic studies of ligand complexes and by structure-based mutagenesis. Obstruction of the pore within the 7-bladed beta-propeller (beta7) domain by alkylation or oxidation of an engineered double cysteine mutant strongly decreased enzymatic activities. In line herewith, the crystal structure of the tricorn protease in complex with a trideca-peptide inhibitor modifying the catalytic Ser965 revealed part of the peptide trapped inside the channel of the beta7 domain. The cysteine mutation widening the lumen of the 6-bladed beta-propeller (beta6) domain enhanced catalytic activity, which was restored to normal values after its alkylation. A charge reversal mutant at the putative anchor site of the substrate C terminus, R131E-R132E, drastically reduced the proteolytic activity. The complex crystal structure of a peptide inhibitor with a diketo group at the cleavage site mapped the substrate recognition site and confirmed the role of Arg131-Arg132 as an anchor site. Our results strongly suggest the wider beta7 domain to serve as a selective filter and guide of the substrate to the sequestered active site, while the narrower beta6 domain routes the product to the surface. Moreover, we identified the role of Arg131-Arg132 in anchoring the substrate C terminus.
About this Structure
1N6D is a Single protein structure of sequence from Thermoplasma acidophilum. Full crystallographic information is available from OCA.
Reference
Navigation inside a protease: substrate selection and product exit in the tricorn protease from Thermoplasma acidophilum., Kim JS, Groll M, Musiol HJ, Behrendt R, Kaiser M, Moroder L, Huber R, Brandstetter H, J Mol Biol. 2002 Dec 13;324(5):1041-50. PMID:12470958
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