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1hpl

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[[Image:1hpl.gif|left|200px]]<br /><applet load="1hpl" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1hpl, resolution 2.3&Aring;" />
 
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'''HORSE PANCREATIC LIPASE. THE CRYSTAL STRUCTURE AT 2.3 ANGSTROMS RESOLUTION'''<br />
 
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==Overview==
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==HORSE PANCREATIC LIPASE. THE CRYSTAL STRUCTURE AT 2.3 ANGSTROMS RESOLUTION==
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Pancreatic lipase (EC 3.1.1.3) plays a key role in dietary fat digestion by converting triacylglycerols into 2-monoacylglycerols and free fatty acids in the intestine. Although the crystallographic structures of the human pancreatic lipase and of a human lipase-porcine colipase complex have been solved, no refined structure of pancreatic lipase has yet been published. The crystal structure of the horse enzyme was solved by the molecular replacement method from the model of the human pancreatic lipase and subsequently refined to 2.3 A resolution. The final model contains two molecules of 449 amino acid residues each in the asymmetric unit, 705 well-defined water molecules and two calcium ions. The two molecules in the asymmetric unit of the orthorhombic crystals are related by a 2-fold non-crystallographic symmetry axis as in the case of the human lipase. However, the association between the two molecules in their respective crystal forms is different. The overall molecular structure of the horse lipase is very similar to that of the human enzyme. The horse lipase is made up of two well-defined domains. The N-terminal domain which bears the active centre has a typical alpha/beta hydrolase fold topology. The C-terminal domain which is devoted to colipase binding has a beta-sheet sandwich topology. Comparison of equivalent C alpha atom positions between the final model of the horse lipase and the human lipase structure shows only slight differences which are mainly located in the C-terminal domain. The horse enzyme possesses the common features of the known mammalian and microbial lipases, in particular the "flap" covering the catalytic triad. In addition to more precise information concerning these features, the elucidation of the horse lipase crystal structure allowed us to better understand the structural basis of the kinetic behaviour of pancreatic lipases towards a soluble substrate, p-nitrophenyl acetate, and the different sensitivity of these enzymes towards limited proteolysis.
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<StructureSection load='1hpl' size='340' side='right'caption='[[1hpl]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1hpl]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Equus_caballus Equus caballus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HPL OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1HPL FirstGlance]. <br>
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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]] 2.3&#8491;</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=CA:CALCIUM+ION'>CA</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=1hpl FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1hpl OCA], [https://pdbe.org/1hpl PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1hpl RCSB], [https://www.ebi.ac.uk/pdbsum/1hpl PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1hpl ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/LIPP_HORSE LIPP_HORSE]
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/hp/1hpl_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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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=1hpl ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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1HPL is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Equus_caballus Equus caballus] with <scene name='pdbligand=CA:'>CA</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Triacylglycerol_lipase Triacylglycerol lipase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.1.3 3.1.1.3] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HPL OCA].
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*[[Lipase|Lipase]]
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*[[Lipase 3D Structures|Lipase 3D Structures]]
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==Reference==
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__TOC__
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Horse pancreatic lipase. The crystal structure refined at 2.3 A resolution., Bourne Y, Martinez C, Kerfelec B, Lombardo D, Chapus C, Cambillau C, J Mol Biol. 1994 May 20;238(5):709-32. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=8182745 8182745]
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</StructureSection>
[[Category: Equus caballus]]
[[Category: Equus caballus]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Triacylglycerol lipase]]
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[[Category: Bourne Y]]
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[[Category: Bourne, Y.]]
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[[Category: Cambillau C]]
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[[Category: Cambillau, C.]]
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[[Category: CA]]
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[[Category: hydrolase(carboxylic esterase)]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:03:34 2008''
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Current revision

HORSE PANCREATIC LIPASE. THE CRYSTAL STRUCTURE AT 2.3 ANGSTROMS RESOLUTION

PDB ID 1hpl

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