|
|
| Line 3: |
Line 3: |
| | <StructureSection load='1c74' size='340' side='right'caption='[[1c74]], [[Resolution|resolution]] 1.90Å' scene=''> | | <StructureSection load='1c74' size='340' side='right'caption='[[1c74]], [[Resolution|resolution]] 1.90Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[1c74]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bovin Bovin]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1C74 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1C74 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[1c74]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1C74 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1C74 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</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]] 1.9Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1mkt|1mkt]]</div></td></tr>
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">MATURE PLA2 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9913 BOVIN])</td></tr> | + | |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Phospholipase_A(2) Phospholipase A(2)], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.1.4 3.1.1.4] </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=1c74 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1c74 OCA], [https://pdbe.org/1c74 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1c74 RCSB], [https://www.ebi.ac.uk/pdbsum/1c74 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1c74 ProSAT]</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=1c74 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1c74 OCA], [https://pdbe.org/1c74 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1c74 RCSB], [https://www.ebi.ac.uk/pdbsum/1c74 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1c74 ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[https://www.uniprot.org/uniprot/PA21B_BOVIN PA21B_BOVIN]] PA2 catalyzes the calcium-dependent hydrolysis of the 2-acyl groups in 3-sn-phosphoglycerides.
| + | [https://www.uniprot.org/uniprot/PA21B_BOVIN PA21B_BOVIN] PA2 catalyzes the calcium-dependent hydrolysis of the 2-acyl groups in 3-sn-phosphoglycerides. |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
| Line 38: |
Line 36: |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Bovin]] | + | [[Category: Bos taurus]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Jain, M K]] | + | [[Category: Jain MK]] |
| - | [[Category: Ramakumar, S]] | + | [[Category: Ramakumar S]] |
| - | [[Category: Sekar, K]] | + | [[Category: Sekar K]] |
| - | [[Category: Tsai, M D]] | + | [[Category: Tsai MD]] |
| - | [[Category: Alpha helix]]
| + | |
| - | [[Category: Beta sheet]]
| + | |
| - | [[Category: Double mutant]]
| + | |
| - | [[Category: Hydrolase]]
| + | |
| Structural highlights
Function
PA21B_BOVIN PA2 catalyzes the calcium-dependent hydrolysis of the 2-acyl groups in 3-sn-phosphoglycerides.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Pancreatic phospholipase A(2) (PLA2) shows a strong preference for the binding to the anionic interface and a consequent allosteric activation. In this paper, we show that virtually all the preference is mediated through 3 (Lys-53, -56, and -120) of the 12 cationic residues of bovine pancreatic PLA2. The lysine-to-methionine substitution enhances the binding of the enzyme to the zwitterionic interface, and for the K53,56,120M triple mutant at the zwitterionic interface is comparable to that for the wild type (WT) at the anionic interface. In the isomorphous crystal structure, the backbone folding of K53,56M K120,121A and WT are virtually identical, yet a significant change in the side chains of certain residues, away from the site of substitution, mostly at the putative contact site with the interface (i-face), is discernible. Such reciprocity, also supported by the spectroscopic results for the free and bound forms of the enzyme, is expected because a distal structural change that perturbs the interfacial binding could also affect the i-face. The results show that lysine-to-methionine substitution induces a structural change that promotes the binding of PLA2 to the interface as well as the substrate binding to the enzyme at the interface. The kinetic results are consistent with a model in which the interfacial Michaelis complex exists in two forms, and the complex that undergoes the chemical step is formed by the charge compensation of Lys-53 and -56. Analysis of the incremental changes in the kinetic parameters shows that the charge compensation of Lys-53 and -56 contributes to the activation and that of Lys-120 contributes only to the structural change that promotes the stability of the Michaelis complex at the interface. The charge compensation effects on these three residues also account for the differences in the anionic interface preference of the evolutionarily divergent secreted PLA2.
Structural basis of the anionic interface preference and kcat* activation of pancreatic phospholipase A2.,Yu BZ, Poi MJ, Ramagopal UA, Jain R, Ramakumar S, Berg OG, Tsai MD, Sekar K, Jain MK Biochemistry. 2000 Oct 10;39(40):12312-23. PMID:11015210[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Yu BZ, Poi MJ, Ramagopal UA, Jain R, Ramakumar S, Berg OG, Tsai MD, Sekar K, Jain MK. Structural basis of the anionic interface preference and kcat* activation of pancreatic phospholipase A2. Biochemistry. 2000 Oct 10;39(40):12312-23. PMID:11015210
|
