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| <StructureSection load='1ivy' size='340' side='right'caption='[[1ivy]], [[Resolution|resolution]] 2.20Å' scene=''> | | <StructureSection load='1ivy' size='340' side='right'caption='[[1ivy]], [[Resolution|resolution]] 2.20Å' scene=''> |
| == Structural highlights == | | == Structural highlights == |
| <table><tr><td colspan='2'>[[1ivy]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IVY OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=1IVY FirstGlance]. <br> | | <table><tr><td colspan='2'>[[1ivy]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IVY OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1IVY FirstGlance]. <br> |
| </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=NDG:2-(ACETYLAMINO)-2-DEOXY-A-D-GLUCOPYRANOSE'>NDG</scene></td></tr> | | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.2Å</td></tr> |
| <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">HUPP54 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr> | | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=NDG:2-(ACETYLAMINO)-2-DEOXY-A-D-GLUCOPYRANOSE'>NDG</scene></td></tr> |
| <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Carboxypeptidase_C Carboxypeptidase C], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.16.5 3.4.16.5] </span></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=1ivy FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ivy OCA], [https://pdbe.org/1ivy PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ivy RCSB], [https://www.ebi.ac.uk/pdbsum/1ivy PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ivy ProSAT]</span></td></tr> |
| <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=1ivy FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ivy OCA], [http://pdbe.org/1ivy PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1ivy RCSB], [http://www.ebi.ac.uk/pdbsum/1ivy PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1ivy ProSAT]</span></td></tr> | |
| </table> | | </table> |
| == Disease == | | == Disease == |
| [[http://www.uniprot.org/uniprot/PPGB_HUMAN PPGB_HUMAN]] Defects in CTSA are the cause of galactosialidosis (GSL) [MIM:[http://omim.org/entry/256540 256540]]. A lysosomal storage disease associated with a combined deficiency of beta-galactosidase and neuraminidase, secondary to a defect in cathepsin A. All patients have clinical manifestations typical of a lysosomal disorder, such as coarse facies, cherry red spots, vertebral changes, foam cells in the bone marrow, and vacuolated lymphocytes. Three phenotypic subtypes are recognized. The early infantile form is associated with fetal hydrops, edema, ascites, visceromegaly, skeletal dysplasia, and early death. The late infantile type is characterized by hepatosplenomegaly, growth retardation, cardiac involvement, and a normal or mildly affected mental state. The juvenile/adult form is characterized by myoclonus, ataxia, angiokeratoma, mental retardation, neurologic deterioration, absence of visceromegaly, and long survival.<ref>PMID:1756715</ref> <ref>PMID:8514852</ref> <ref>PMID:8968752</ref> <ref>PMID:10944848</ref> | | [https://www.uniprot.org/uniprot/PPGB_HUMAN PPGB_HUMAN] Defects in CTSA are the cause of galactosialidosis (GSL) [MIM:[https://omim.org/entry/256540 256540]. A lysosomal storage disease associated with a combined deficiency of beta-galactosidase and neuraminidase, secondary to a defect in cathepsin A. All patients have clinical manifestations typical of a lysosomal disorder, such as coarse facies, cherry red spots, vertebral changes, foam cells in the bone marrow, and vacuolated lymphocytes. Three phenotypic subtypes are recognized. The early infantile form is associated with fetal hydrops, edema, ascites, visceromegaly, skeletal dysplasia, and early death. The late infantile type is characterized by hepatosplenomegaly, growth retardation, cardiac involvement, and a normal or mildly affected mental state. The juvenile/adult form is characterized by myoclonus, ataxia, angiokeratoma, mental retardation, neurologic deterioration, absence of visceromegaly, and long survival.<ref>PMID:1756715</ref> <ref>PMID:8514852</ref> <ref>PMID:8968752</ref> <ref>PMID:10944848</ref> |
| == Function == | | == Function == |
| [[http://www.uniprot.org/uniprot/PPGB_HUMAN PPGB_HUMAN]] Protective protein appears to be essential for both the activity of beta-galactosidase and neuraminidase, it associates with these enzymes and exerts a protective function necessary for their stability and activity. This protein is also a carboxypeptidase and can deamidate tachykinins.<ref>PMID:1907282</ref> | | [https://www.uniprot.org/uniprot/PPGB_HUMAN PPGB_HUMAN] Protective protein appears to be essential for both the activity of beta-galactosidase and neuraminidase, it associates with these enzymes and exerts a protective function necessary for their stability and activity. This protein is also a carboxypeptidase and can deamidate tachykinins.<ref>PMID:1907282</ref> |
| == Evolutionary Conservation == | | == Evolutionary Conservation == |
| [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| </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/main_output.php?pdb_ID=1ivy ConSurf]. | | </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/main_output.php?pdb_ID=1ivy ConSurf]. |
| <div style="clear:both"></div> | | <div style="clear:both"></div> |
| <div style="background-color:#fffaf0;">
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| == Publication Abstract from PubMed ==
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| BACKGROUND: The human 'protective protein' (HPP) forms a multi-enzyme complex with beta-galactosidase and neuraminidase in the lysosomes, protecting these two glycosidases from degradation. In humans, deficiency of HPP leads to the lysosomal storage disease galactosialidosis. Proteolytic cleavage of the precursor form of HPP involves removal of a 2 kDa excision peptide and results in a carboxypeptidase activity. The physiological relevance of this activity is, as yet, unknown. RESULTS: The crystal structure of the 108 kDa dimer of the precursor HPP has been elucidated by making extensive use of twofold density averaging. The monomer consists of a 'core' domain and a 'cap' domain. Comparison with the distantly related wheat serine carboxypeptidase dimer shows that the two subunits in the HPP dimer differ by 15 degrees in mutual orientation. Also, the helical subdomain forming part of the cap domains is very different. In addition, the HPP precursor cap domain contains a 'maturation' subdomain of 49 residues which fills the active-site cleft. Merely removing the 'excision' peptide located in the maturation subdomain does not render the catalytic triad solvent accessible. CONCLUSIONS: The activation mechanism of HPP is unique among proteases with known structure. It differs from the serine proteases in that the active site is performed in the zymogen, but is blocked by a maturation subdomain. In contrast to the zinc metalloproteases and aspartic proteases, the chain segment physically rendering the catalytic triad solvent inaccessible in HPP is not cleaved off to form the active enzyme. The activation must be a multi-step process involving removal of the excision peptide and major conformational changes of the maturation subdomain, whereas the conformation of the enzymatic machinery is probably almost, or completely, unaffected.
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| Three-dimensional structure of the human 'protective protein': structure of the precursor form suggests a complex activation mechanism.,Rudenko G, Bonten E, d'Azzo A, Hol WG Structure. 1995 Nov 15;3(11):1249-59. PMID:8591035<ref>PMID:8591035</ref>
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| From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
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| </div>
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| <div class="pdbe-citations 1ivy" style="background-color:#fffaf0;"></div>
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| ==See Also== | | ==See Also== |
| *[[Carboxypeptidase 3D structures|Carboxypeptidase 3D structures]] | | *[[Carboxypeptidase 3D structures|Carboxypeptidase 3D structures]] |
| *[[Cathepsin 3D structures|Cathepsin 3D structures]] | | *[[Cathepsin 3D structures|Cathepsin 3D structures]] |
| *[[Molecular Playground/Human PPCA|Molecular Playground/Human PPCA]]
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| *[[Molecular Playground/PPCA|Molecular Playground/PPCA]]
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| == References == | | == References == |
| <references/> | | <references/> |
| __TOC__ | | __TOC__ |
| </StructureSection> | | </StructureSection> |
| [[Category: Carboxypeptidase C]] | | [[Category: Homo sapiens]] |
| [[Category: Human]]
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| [[Category: Large Structures]] | | [[Category: Large Structures]] |
| [[Category: Azzo, A D]] | | [[Category: Bonten E]] |
| [[Category: Bonten, E]] | | [[Category: D'Azzo A]] |
| [[Category: Hol, W G.J]] | | [[Category: Hol WGJ]] |
| [[Category: Rudenko, G]] | | [[Category: Rudenko G]] |
| [[Category: Carboxypeptidase]]
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| [[Category: Glycoprotein]]
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| [[Category: Protective protein]]
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| [[Category: Serine carboxypeptidase]]
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| [[Category: Zymogen]]
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