2f9o

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[[Image:2f9o.gif|left|200px]]
 
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==Crystal Structure of the Recombinant Human Alpha I Tryptase Mutant D216G==
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The line below this paragraph, containing "STRUCTURE_2f9o", creates the "Structure Box" on the page.
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<StructureSection load='2f9o' size='340' side='right'caption='[[2f9o]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2F9O OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2F9O FirstGlance]. <br>
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or leave the SCENE parameter empty for the default display.
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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='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FUC:ALPHA-L-FUCOSE'>FUC</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr>
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{{STRUCTURE_2f9o| PDB=2f9o | SCENE= }}
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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=2f9o FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2f9o OCA], [https://pdbe.org/2f9o PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2f9o RCSB], [https://www.ebi.ac.uk/pdbsum/2f9o PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2f9o ProSAT]</span></td></tr>
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</table>
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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/f9/2f9o_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=2f9o ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Tryptases alpha and beta are trypsin-like serine proteinases expressed in large amounts by mast cells. Beta-tryptase is a tetramer that has enzymatic activity, but requires heparin binding to maintain functional and structural stability, whereas alpha-tryptase has little, if any, enzymatic activity but is a stable tetramer in the absence of heparin. As shown previously, these differences can be mainly attributed to the different conformations of the 214-220 segment. Interestingly, the replacement of Asp216 by Gly, which is present in beta-tryptase, results in enzymatically active but less stable alpha-tryptase mutants. We have solved the crystal structures of both the single (D216G) and the double (K192Q/D216G) mutant forms of recombinant human alphaI-tryptase in complex with the peptide inhibitor leupeptin, as well as the structure of the non-inhibited single mutant. The inhibited mutants exhibited an open functional substrate binding site, while in the absence of an inhibitor, the open (beta-tryptase-like) and the closed (alpha-tryptase-like) conformations were present simultaneously. This shows that both forms are in a two-state equilibrium, which is influenced by the residues in the vicinity of the active site and by inhibitor/substrate binding. Novel insights regarding the observed stability differences as well as a potential proteolytic activity of wild-type alpha-tryptase, which may possess a cryptic active site, are discussed.
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'''Crystal Structure of the Recombinant Human Alpha I Tryptase Mutant D216G'''
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X-ray structures of free and leupeptin-complexed human alphaI-tryptase mutants: indication for an alpha--&gt;beta-tryptase transition.,Rohr KB, Selwood T, Marquardt U, Huber R, Schechter NM, Bode W, Than ME J Mol Biol. 2006 Mar 17;357(1):195-209. Epub 2005 Dec 28. PMID:16414069<ref>PMID:16414069</ref>
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==Overview==
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Tryptases alpha and beta are trypsin-like serine proteinases expressed in large amounts by mast cells. Beta-tryptase is a tetramer that has enzymatic activity, but requires heparin binding to maintain functional and structural stability, whereas alpha-tryptase has little, if any, enzymatic activity but is a stable tetramer in the absence of heparin. As shown previously, these differences can be mainly attributed to the different conformations of the 214-220 segment. Interestingly, the replacement of Asp216 by Gly, which is present in beta-tryptase, results in enzymatically active but less stable alpha-tryptase mutants. We have solved the crystal structures of both the single (D216G) and the double (K192Q/D216G) mutant forms of recombinant human alphaI-tryptase in complex with the peptide inhibitor leupeptin, as well as the structure of the non-inhibited single mutant. The inhibited mutants exhibited an open functional substrate binding site, while in the absence of an inhibitor, the open (beta-tryptase-like) and the closed (alpha-tryptase-like) conformations were present simultaneously. This shows that both forms are in a two-state equilibrium, which is influenced by the residues in the vicinity of the active site and by inhibitor/substrate binding. Novel insights regarding the observed stability differences as well as a potential proteolytic activity of wild-type alpha-tryptase, which may possess a cryptic active site, are discussed.
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==About this Structure==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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2F9O is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2F9O OCA].
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</div>
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<div class="pdbe-citations 2f9o" style="background-color:#fffaf0;"></div>
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==Reference==
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==See Also==
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X-ray structures of free and leupeptin-complexed human alphaI-tryptase mutants: indication for an alpha--&gt;beta-tryptase transition., Rohr KB, Selwood T, Marquardt U, Huber R, Schechter NM, Bode W, Than ME, J Mol Biol. 2006 Mar 17;357(1):195-209. Epub 2005 Dec 28. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16414069 16414069]
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*[[Tryptase|Tryptase]]
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[[Category: Homo sapiens]]
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== References ==
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[[Category: Single protein]]
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<references/>
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[[Category: Tryptase]]
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__TOC__
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[[Category: Bode, W.]]
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</StructureSection>
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[[Category: Huber, R.]]
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[[Category: Large Structures]]
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[[Category: Marquardt, U.]]
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[[Category: Bode W]]
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[[Category: Rohr, K B.]]
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[[Category: Huber R]]
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[[Category: Schechter, N M.]]
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[[Category: Marquardt U]]
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[[Category: Selwood, T.]]
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[[Category: Rohr KB]]
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[[Category: Than, M E.]]
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[[Category: Schechter NM]]
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[[Category: Difucosylation]]
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[[Category: Selwood T]]
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[[Category: Serine proteinase]]
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[[Category: Than ME]]
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[[Category: Trypsin-like]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 03:38:04 2008''
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Current revision

Crystal Structure of the Recombinant Human Alpha I Tryptase Mutant D216G

PDB ID 2f9o

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