1sc1
From Proteopedia
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| - | [[Image:1sc1.gif|left|200px]] | + | [[Image:1sc1.gif|left|200px]] |
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| - | '''Crystal structure of an active-site ligand-free form of the human caspase-1 C285A mutant''' | + | {{Structure |
| + | |PDB= 1sc1 |SIZE=350|CAPTION= <scene name='initialview01'>1sc1</scene>, resolution 2.60Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=CL:CHLORIDE ION'>CL</scene> | ||
| + | |ACTIVITY= [http://en.wikipedia.org/wiki/Caspase-1 Caspase-1], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.22.36 3.4.22.36] | ||
| + | |GENE= CASP1, IL1BC, IL1BCE ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens]) | ||
| + | }} | ||
| + | |||
| + | '''Crystal structure of an active-site ligand-free form of the human caspase-1 C285A mutant''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1SC1 is a [ | + | 1SC1 is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SC1 OCA]. |
==Reference== | ==Reference== | ||
| - | Crystal structures of a ligand-free and malonate-bound human caspase-1: implications for the mechanism of substrate binding., Romanowski MJ, Scheer JM, O'Brien T, McDowell RS, Structure. 2004 Aug;12(8):1361-71. PMID:[http:// | + | Crystal structures of a ligand-free and malonate-bound human caspase-1: implications for the mechanism of substrate binding., Romanowski MJ, Scheer JM, O'Brien T, McDowell RS, Structure. 2004 Aug;12(8):1361-71. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15296730 15296730] |
[[Category: Caspase-1]] | [[Category: Caspase-1]] | ||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
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[[Category: ligand-free caspase-1]] | [[Category: ligand-free caspase-1]] | ||
| - | ''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 14:03:01 2008'' |
Revision as of 12:03, 20 March 2008
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| , resolution 2.60Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | |||||||
| Gene: | CASP1, IL1BC, IL1BCE (Homo sapiens) | ||||||
| Activity: | Caspase-1, with EC number 3.4.22.36 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Crystal structure of an active-site ligand-free form of the human caspase-1 C285A mutant
Overview
Caspase-1, a mediator of the posttranslational processing of IL-1beta and IL-18, requires an aspartic acid in the P1 position of its substrates. The mechanisms of caspase-1 activation remain poorly understood despite numerous structures of the enzyme complexed with aspartate-based inhibitors. Here we report a crystal structure of ligand-free caspase-1 that displays dramatic rearrangements of loops defining the active site to generate a closed conformation that is incompatible with substrate binding. A structure of the enzyme complexed with malonate shows the protein in its open (active-site ligand-bound) conformation in which malonate reproduces the hydrogen bonding network observed in structures with covalent inhibitors. These results illustrate the essential function of the obligatory aspartate recognition element that opens the active site of caspase-1 to substrates and may be the determinant responsible for the conformational changes between ligand-free and -bound forms of the enzyme, and suggest a new approach for identifying novel aspartic acid mimetics.
About this Structure
1SC1 is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Crystal structures of a ligand-free and malonate-bound human caspase-1: implications for the mechanism of substrate binding., Romanowski MJ, Scheer JM, O'Brien T, McDowell RS, Structure. 2004 Aug;12(8):1361-71. PMID:15296730
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