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5t69

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==The HhoA protease from Synechocystis sp. PCC 6803, active site mutant==
==The HhoA protease from Synechocystis sp. PCC 6803, active site mutant==
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<StructureSection load='5t69' size='340' side='right' caption='[[5t69]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
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<StructureSection load='5t69' size='340' side='right'caption='[[5t69]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[5t69]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5T69 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5T69 FirstGlance]. <br>
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<table><tr><td colspan='2'>[[5t69]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Synechocystis_sp._PCC_6803_substr._Kazusa Synechocystis sp. PCC 6803 substr. Kazusa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5T69 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5T69 FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.1&#8491;</td></tr>
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<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=5t69 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5t69 OCA], [http://pdbe.org/5t69 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5t69 RCSB], [http://www.ebi.ac.uk/pdbsum/5t69 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5t69 ProSAT]</span></td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=5t69 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5t69 OCA], [https://pdbe.org/5t69 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5t69 RCSB], [https://www.ebi.ac.uk/pdbsum/5t69 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5t69 ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
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[[http://www.uniprot.org/uniprot/HHOA_SYNY3 HHOA_SYNY3]] A putative protease, its function overlaps that of the related putative proteases HhoB and HtrA.<ref>PMID:16912048</ref>
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[https://www.uniprot.org/uniprot/HHOA_SYNY3 HHOA_SYNY3] A putative protease, its function overlaps that of the related putative proteases HhoB and HtrA.<ref>PMID:16912048</ref>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Proteases play a vital role in the removal of proteins, which become damaged due to temperature or oxidative stress. Important to this process in the cyanobacterium Synechocystis sp. PCC6803 is the family of Deg/HtrA proteases; HhoA (sll1679), HhoB (sll1427) and HtrA (slr1204). While previous studies have elucidated the structures of Deg/HtrA proteases from Escherichia coli and from the chloroplast of the higher plant Arabidopsis thaliana, no structural data have been available for any Deg/HtrA protease from cyanobacteria, the evolutionary ancestor of the chloroplast. To gain a deeper insight into the molecular mechanisms and regulation of these proteins we have solved the structure of the Synechocystis HhoA protease in complex with a co-purified peptide by X-ray crystallography. HhoA assembles into stable trimers, mediated by its protease domain and further into a cage-like hexamer by a novel interaction between the PDZ domains of opposing trimers. Each PDZ domain contains two loops for PDZ-PDZ formation: interaction clamp one and two (IC1, IC2). IC1 interacts with IC2 on the opposing PDZ domain and vice versa. Our structure shows a peptide bound to a conserved groove on the PDZ domain and the properties of this pocket suggest that it binds substrate proteins as well as the neo C-termini of cleaved substrates. In agreement with previous studies showing the proteolytic activity of HhoA to be activated by Ca2+ or Mg2+, binding of divalent metal ions to the central channel of the trimer by the L1 activation loop was observed.
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The HhoA protease from Synechocystis sp. PCC 6803 - novel insights into structure and activity regulation.,Hall M, Wagner R, Tam Lam X, Funk C, Persson K J Struct Biol. 2016 Dec 9. pii: S1047-8477(16)30250-7. doi:, 10.1016/j.jsb.2016.12.004. PMID:27956128<ref>PMID:27956128</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 5t69" style="background-color:#fffaf0;"></div>
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== References ==
== References ==
<references/>
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
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[[Category: Funk, C]]
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[[Category: Large Structures]]
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[[Category: Hall, M]]
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[[Category: Synechocystis sp. PCC 6803 substr. Kazusa]]
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[[Category: Persson, K]]
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[[Category: Funk C]]
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[[Category: Hydrolase]]
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[[Category: Hall M]]
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[[Category: Pdz domain]]
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[[Category: Persson K]]
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[[Category: Protease]]
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Current revision

The HhoA protease from Synechocystis sp. PCC 6803, active site mutant

PDB ID 5t69

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