1wsd

==Alkaline M-protease form I crystal strcuture==

<StructureSection load='1wsd' size='340' side='right' caption='[[1wsd]], [[Resolution|resolution]] 1.50&Aring;' scene=''>

<table><tr><td colspan='2'>[[1wsd]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Bacillus_clausii Bacillus clausii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1WSD OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1WSD FirstGlance]. <br>

</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene><br>

<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1wsd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1wsd OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1wsd RCSB], [http://www.ebi.ac.uk/pdbsum/1wsd PDBsum]</span></td></tr>

<table>

<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ws/1wsd_consurf.spt"</scriptWhenChecked>

</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/chain_selection.php?pdb_ID=2ata ConSurf].

<div style="background-color:#fffaf0;">

== Publication Abstract from PubMed ==

M-protease is a subtilisin-family serine protease produced by an alkaliphilic Bacillus sp. strain. Optimal enzymatic activity of the protein occurs at pH 12.3. The crystal structure of M-protease (space group P2(1)2(1)2(1), a = 62.3, b = 75.5, c = 47.2 A) has been refined to a crystallographic R-factor of 17.2% at 1.5 A resolution. The alkaline adaptation mechanism of the enzyme was analyzed. Molecular phylogeny construction was used to determine the amino acid substitutions that occurred during the high-alkaline adaptation process. This analysis revealed a decrease in the number of negatively charged amino acids (aspartic acid and glutamic acid) and lysine residues and an increase in arginine and neutral hydrophilic amino acids (histidine, asparagine and glutamine) residues during the course of adaptation. These substitutions increased the isoelectric point of M-protease. Some of the acquired arginine residues form hydrogen bonds or ion pairs to combine both N- and C-terminal regions of M-protease. The substituted residues are localized to a hemisphere of the globular protein molecule where positional shifts of peptide segments, relative to those of the less alkaliphilic subtilisin Carlsberg, are observed. The biased distribution and interactions caused by the substituted residues seem to be responsible for stabilization of the conformation in a high-alkaline condition.

High-resolution crystal structure of M-protease: phylogeny aided analysis of the high-alkaline adaptation mechanism.,Shirai T, Suzuki A, Yamane T, Ashida T, Kobayashi T, Hitomi J, Ito S Protein Eng. 1997 Jun;10(6):627-34. PMID:9278275<ref>PMID:9278275</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

</div>

[[Category: Bacillus clausii]]

[[Category: Ashida, T.]]

[[Category: Hitomi, J.]]

[[Category: Ito, S.]]

[[Category: Kobayashi, T.]]

[[Category: Shirai, T.]]

[[Category: Suzuki, A.]]

[[Category: Yamane, T.]]

[[Category: Subtilisin]]