3m7u: Difference between revisions
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==Crystal Structure of Alpha-Lytic Protease SB1+2 R64A/E182Q Mutant== | ==Crystal Structure of Alpha-Lytic Protease SB1+2 R64A/E182Q Mutant== | ||
<StructureSection load='3m7u' size='340' side='right' caption='[[3m7u]], [[Resolution|resolution]] 1.05Å' scene=''> | <StructureSection load='3m7u' size='340' side='right' caption='[[3m7u]], [[Resolution|resolution]] 1.05Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[3m7u]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/ | <table><tr><td colspan='2'>[[3m7u]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_29487 Atcc 29487]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3M7U OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3M7U FirstGlance]. <br> | ||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | ||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3m7t|3m7t]], [[1ssx|1ssx]], [[1tal|1tal]]</td></tr> | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3m7t|3m7t]], [[1ssx|1ssx]], [[1tal|1tal]]</td></tr> | ||
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">alpha-LP, Lysobacter ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=69 | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">alpha-LP, Lysobacter ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=69 ATCC 29487])</td></tr> | ||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Alpha-lytic_endopeptidase Alpha-lytic endopeptidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.12 3.4.21.12] </span></td></tr> | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Alpha-lytic_endopeptidase Alpha-lytic endopeptidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.12 3.4.21.12] </span></td></tr> | ||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3m7u FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3m7u OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3m7u RCSB], [http://www.ebi.ac.uk/pdbsum/3m7u PDBsum]</span></td></tr> | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3m7u FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3m7u OCA], [http://pdbe.org/3m7u PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3m7u RCSB], [http://www.ebi.ac.uk/pdbsum/3m7u PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3m7u ProSAT]</span></td></tr> | ||
</table> | </table> | ||
<div style="background-color:#fffaf0;"> | <div style="background-color:#fffaf0;"> | ||
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | </div> | ||
<div class="pdbe-citations 3m7u" style="background-color:#fffaf0;"></div> | |||
==See Also== | ==See Also== | ||
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</StructureSection> | </StructureSection> | ||
[[Category: Alpha-lytic endopeptidase]] | [[Category: Alpha-lytic endopeptidase]] | ||
[[Category: | [[Category: Atcc 29487]] | ||
[[Category: Agard, D A]] | [[Category: Agard, D A]] | ||
[[Category: Bailey, F P.Erciyas]] | [[Category: Bailey, F P.Erciyas]] | ||
Revision as of 01:43, 5 August 2016
Crystal Structure of Alpha-Lytic Protease SB1+2 R64A/E182Q MutantCrystal Structure of Alpha-Lytic Protease SB1+2 R64A/E182Q Mutant
Structural highlights
Publication Abstract from PubMedThe crystal structure of the extracellular bacterial serine protease alpha-lytic protease (alphaLP) has been solved at 0.83 A resolution at pH 8. This ultra-high resolution structure allows accurate analysis of structural elements not possible with previous structures. Hydrogen atoms are visible, and confirm active-site hydrogen-bonding interactions expected for the apo enzyme. In particular, His57 N(delta1) participates in a normal hydrogen bond with Asp102 in the catalytic triad, with a hydrogen atom visible 0.83(+/-0.06)A from the His N(delta1). The catalytic Ser195 occupies two conformations, one corresponding to a population of His57 that is doubly protonated, the other to the singly protonated His57. Based on the occupancy of these conformations, the pKa of His57 is calculated to be approximately 8.8 when a sulfate ion occupies the active site. This 0.83 A structure has allowed critical analysis of geometric distortions within the structure. Interestingly, Phe228 is significantly distorted from planarity. The distortion of Phe228, buried in the core of the C-terminal domain, occurs at an estimated energetic cost of 4.1 kcal/mol. The conformational space for Phe228 is severely limited by the presence of Trp199, which prevents Phe228 from adopting the rotamer observed in many other chymotrypsin family members. In alphaLP, the only allowed rotamer leads to the deformation of Phe228 due to steric interactions with Thr181. We hypothesize that tight packing of co-evolved residues in this region, and the subsequent deformation of Phe228, contributes to the high cooperativity and large energetic barriers for folding and unfolding of alphaLP. The kinetic stability imparted by the large, cooperative unfolding barrier plays a critical role in extending the lifetime of the protease in its harsh environment. The 0.83 A resolution crystal structure of alpha-lytic protease reveals the detailed structure of the active site and identifies a source of conformational strain.,Fuhrmann CN, Kelch BA, Ota N, Agard DA J Mol Biol. 2004 May 14;338(5):999-1013. PMID:15111063[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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