2ixt
From Proteopedia
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'''SPHERICASE''' | '''SPHERICASE''' | ||
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[[Category: Godin, N.]] | [[Category: Godin, N.]] | ||
[[Category: Gonzalez, A.]] | [[Category: Gonzalez, A.]] | ||
| - | [[Category: | + | [[Category: Hydrolase]] |
| - | [[Category: | + | [[Category: Protease]] |
| - | [[Category: | + | [[Category: Serine protease]] |
| - | [[Category: | + | [[Category: Sphericase]] |
| - | [[Category: | + | [[Category: Subtilisin like protease]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 08:03:07 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 05:03, 4 May 2008
SPHERICASE
Overview
We have previously isolated sphericase (Sph), an extracellular mesophilic serine protease produced by Bacillus sphaericus. The Sph amino acid sequence is highly homologous to two cold-adapted subtilisins from Antarctic bacilli S39 and S41 (76% and 74% identity, respectively). Sph is calcium-dependent, 310 amino acid residues long and has optimal activity at pH 10.0. S41 and S39 have not as yet been structurally analysed.In the present work, we determined the crystal structure of Sph by the Eu/multiwavelength anomalous diffraction method. The structure was extended to 0.93A resolution and refined to a crystallographic R-factor of 9.7%. The final model included all 310 amino acid residues, one disulfide bond, 679 water molecules and five calcium ions. Although Sph is a mesophilic subtilisin, its amino acid sequence is similar to that of the psychrophilic subtilisins, which suggests that the crystal structure of these subtilisins is very similar.The presence of five calcium ions bound to a subtilisin molecule, as found here for Sph, has not been reported for the subtilisin superfamily. None of these calcium-binding sites correlates with the well-known high-affinity calcium-binding site (site I or site A), and only one site has been described previously. This calcium-binding pattern suggests that a reduction in the flexibility of the surface loops of Sph by calcium binding may be responsible for its adaptation to mesophilic organisms.
About this Structure
2IXT is a Single protein structure of sequence from Lysinibacillus sphaericus. Full crystallographic information is available from OCA.
Reference
The 0.93A crystal structure of sphericase: a calcium-loaded serine protease from Bacillus sphaericus., Almog O, Gonzalez A, Klein D, Greenblatt HM, Braun S, Shoham G, J Mol Biol. 2003 Oct 3;332(5):1071-82. PMID:14499610 Page seeded by OCA on Sun May 4 08:03:07 2008
