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| | ==Structure of intermediate processing form of cathepsin B1 from Schistosoma mansoni== | | ==Structure of intermediate processing form of cathepsin B1 from Schistosoma mansoni== |
| - | <StructureSection load='4i05' size='340' side='right' caption='[[4i05]], [[Resolution|resolution]] 1.90Å' scene=''> | + | <StructureSection load='4i05' size='340' side='right'caption='[[4i05]], [[Resolution|resolution]] 1.90Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4i05]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Blood_fluke Blood fluke]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4I05 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4I05 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4i05]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Schistosoma_mansoni Schistosoma mansoni]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4I05 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4I05 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=NA:SODIUM+ION'>NA</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CSO:S-HYDROXYCYSTEINE'>CSO</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene></td></tr> |
| - | <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=CSO:S-HYDROXYCYSTEINE'>CSO</scene></td></tr>
| + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4i05 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4i05 OCA], [https://pdbe.org/4i05 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4i05 RCSB], [https://www.ebi.ac.uk/pdbsum/4i05 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4i05 ProSAT]</span></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3qsd|3qsd]], [[3s3r|3s3r]], [[3s3q|3s3q]], [[4i04|4i04]], [[4i07|4i07]]</td></tr>
| + | |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">cb1.1, Smp_103610 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=6183 Blood fluke])</td></tr>
| + | |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Cathepsin_B Cathepsin B], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.22.1 3.4.22.1] </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=4i05 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4i05 OCA], [http://pdbe.org/4i05 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4i05 RCSB], [http://www.ebi.ac.uk/pdbsum/4i05 PDBsum]</span></td></tr> | + | |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/Q8MNY2_SCHMA Q8MNY2_SCHMA] |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Blood fluke]] | + | [[Category: Large Structures]] |
| - | [[Category: Cathepsin B]] | + | [[Category: Schistosoma mansoni]] |
| - | [[Category: Brynda, J]] | + | [[Category: Brynda J]] |
| - | [[Category: Horn, M]] | + | [[Category: Horn M]] |
| - | [[Category: Jilkova, A]] | + | [[Category: Jilkova A]] |
| - | [[Category: Mares, M]] | + | [[Category: Mares M]] |
| - | [[Category: Rezacova, P]] | + | [[Category: Rezacova P]] |
| - | [[Category: Digestive tract]]
| + | |
| - | [[Category: Hydrolase]]
| + | |
| - | [[Category: Peptidase]]
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| Structural highlights
Function
Q8MNY2_SCHMA
Publication Abstract from PubMed
Cathepsin B1 (SmCB1) is a digestive protease of the parasitic blood fluke Schistosoma mansoni and a drug target for the treatment of schistosomiasis, a disease that afflicts over 200 million people. SmCB1 is synthesized as an inactive zymogen in which the N-terminal propeptide blocks the active site. We investigated the activation of the zymogen by which the propeptide is proteolytically removed and its regulation by sulfated polysaccharides (SPs). We determined crystal structures of three molecular forms of SmCB1 along the activation pathway: the zymogen, an activation intermediate with a partially cleaved propeptide, and the mature enzyme. We demonstrate that SPs are essential for the autocatalytic activation of SmCB1, as they interact with a specific heparin-binding domain in the propeptide. An alternative activation route is mediated by an S. mansoni asparaginyl endopeptidase (legumain) which is downregulated by SPs, indicating that SPs act as a molecular switch between both activation mechanisms.
Activation route of the Schistosoma mansoni cathepsin B1 drug target: structural map with a glycosaminoglycan switch.,Jilkova A, Horn M, Rezacova P, Maresova L, Fajtova P, Brynda J, Vondrasek J, McKerrow JH, Caffrey CR, Mares M Structure. 2014 Dec 2;22(12):1786-98. doi: 10.1016/j.str.2014.09.015. Epub 2014, Nov 13. PMID:25456815[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Jilkova A, Horn M, Rezacova P, Maresova L, Fajtova P, Brynda J, Vondrasek J, McKerrow JH, Caffrey CR, Mares M. Activation route of the Schistosoma mansoni cathepsin B1 drug target: structural map with a glycosaminoglycan switch. Structure. 2014 Dec 2;22(12):1786-98. doi: 10.1016/j.str.2014.09.015. Epub 2014, Nov 13. PMID:25456815 doi:http://dx.doi.org/10.1016/j.str.2014.09.015
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