1dbi
From Proteopedia
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|PDB= 1dbi |SIZE=350|CAPTION= <scene name='initialview01'>1dbi</scene>, resolution 1.8Å | |PDB= 1dbi |SIZE=350|CAPTION= <scene name='initialview01'>1dbi</scene>, resolution 1.8Å | ||
|SITE= | |SITE= | ||
| - | |LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene> | + | |LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene> |
|ACTIVITY= | |ACTIVITY= | ||
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY= | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1dbi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1dbi OCA], [http://www.ebi.ac.uk/pdbsum/1dbi PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1dbi RCSB]</span> | ||
}} | }} | ||
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[[Category: Smith, C A.]] | [[Category: Smith, C A.]] | ||
[[Category: Toogood, H S.]] | [[Category: Toogood, H S.]] | ||
| - | [[Category: CA]] | ||
| - | [[Category: NA]] | ||
[[Category: hydrolase]] | [[Category: hydrolase]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 19:38:20 2008'' |
Revision as of 16:38, 30 March 2008
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| , resolution 1.8Å | |||||||
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| Ligands: | , | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
CRYSTAL STRUCTURE OF A THERMOSTABLE SERINE PROTEASE
Overview
Proteins of the subtilisin superfamily (subtilases) are widely distributed through many living species, where they perform a variety of processing functions. They are also used extensively in industry. In many of these enzymes, bound calcium ions play a key role in protecting against autolysis and thermal denaturation. We have determined the crystal structure of a highly thermostable protease from Bacillus sp. Ak.1 that is strongly stabilized by calcium. The crystal structure, determined at 1.8 A resolution (R=0. 182, Rfree=0.247), reveals the presence of four bound cations, three Ca(2+) and one Na(+). Two of the Ca(2+) binding sites, Ca-1 and Ca-2, correspond to sites also found in thermitase and the mesophilic subtilisins. The third calcium ion, however, is at a novel site that is created by two key amino acid substitutions near Ca-1, and has not been observed in any other subtilase. This site, acting cooperatively with Ca-1, appears to give substantially enhanced thermostability, compared with thermitase. Comparisons with the mesophilic subtilisins also point to the importance of aromatic clusters, reduced hydrophobic surface and constrained N and C termini in enhancing the thermostability of thermitase and Ak.1 protease. The Ak.1 protease also contains an unusual Cys-X-Cys disulfide bridge that modifies the active site cleft geometry.
About this Structure
1DBI is a Single protein structure of sequence from Bacillus sp.. Full crystallographic information is available from OCA.
Reference
Calcium-mediated thermostability in the subtilisin superfamily: the crystal structure of Bacillus Ak.1 protease at 1.8 A resolution., Smith CA, Toogood HS, Baker HM, Daniel RM, Baker EN, J Mol Biol. 1999 Dec 10;294(4):1027-40. PMID:10588904
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