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{{STRUCTURE_1st3|  PDB=1st3  |  SCENE=  }}  
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'''THE CRYSTAL STRUCTURE OF THE BACILLUS LENTUS ALKALINE PROTEASE, SUBTILISIN BL, AT 1.4 ANGSTROMS RESOLUTION'''
===THE CRYSTAL STRUCTURE OF THE BACILLUS LENTUS ALKALINE PROTEASE, SUBTILISIN BL, AT 1.4 ANGSTROMS RESOLUTION===




==Overview==
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The crystal structure of subtilisin BL, an alkaline protease from Bacillus lentus with activity at pH 11, has been determined to 1.4 A resolution. The structure was solved by molecular replacement starting with the 2.1 A structure of subtilisin BPN' followed by molecular dynamics refinement using X-PLOR. A final crystallographic R-factor of 19% overall was obtained. The enzyme possesses stability at high pH, which is a result of the high pI of the protein. Almost all of the acidic side-chains are involved in some type of electrostatic interaction (ion pairs, calcium binding, etc.). Furthermore, three of seven tyrosine residues have potential partners for forming salt bridges. All of the potential partners are arginine with a pK around 12. Lysine would not function well in a salt bridge with tyrosine as it deprotonates at around the same pH as tyrosine ionizes. Stability at high pH is acquired in part from the pI of the protein, but also from the formation of salt bridges (which would affect the pI). The overall structure of the enzyme is very similar to other subtilisins and shows that the subtilisin fold is more highly conserved than would be expected from the differences in amino acid sequence. The amino acid side-chains in the hydrophobic core are not conserved, though the inter-residue interactions are. Finally, one third of the serine side-chains in the protein have multiple conformations. This presents an opportunity to correlate computer simulations with observed occupancies in the crystal structure.
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==About this Structure==
==About this Structure==
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[[Category: Goddette, D W.]]
[[Category: Goddette, D W.]]
[[Category: Serine protease]]
[[Category: Serine protease]]
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Revision as of 18:01, 27 July 2008

File:1st3.png

Template:STRUCTURE 1st3

THE CRYSTAL STRUCTURE OF THE BACILLUS LENTUS ALKALINE PROTEASE, SUBTILISIN BL, AT 1.4 ANGSTROMS RESOLUTION

Template:ABSTRACT PUBMED 1453465

About this Structure

1ST3 is a Single protein structure of sequence from Bacillus lentus. Full crystallographic information is available from OCA.

Reference

The crystal structure of the Bacillus lentus alkaline protease, subtilisin BL, at 1.4 A resolution., Goddette DW, Paech C, Yang SS, Mielenz JR, Bystroff C, Wilke ME, Fletterick RJ, J Mol Biol. 1992 Nov 20;228(2):580-95. PMID:1453465

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