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1lto

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[[Image:1lto.gif|left|200px]]<br /><applet load="1lto" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1lto, resolution 2.20&Aring;" />
 
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'''Human alpha1-tryptase'''<br />
 
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==Overview==
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==Human alpha1-tryptase==
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Human mast cell tryptases represent a subfamily of trypsin-like serine proteinases implicated in asthma. Unlike beta-tryptases, alpha-tryptases apparently are proteolytically inactive. We have solved the 2.2A crystal structure of mature human alpha1-tryptase. It reveals a frame-like tetrameric architecture that, surprisingly, does not require heparin-binding for stability. In marked contrast to beta2-tryptase, the Ser214-Gly219 segment, which normally provides the template for substrate binding, is kinked in alpha-tryptase, thereby blocking its non-primed subsites. This so far unobserved subsite distortion is incompatible with productive substrate binding and processing. alpha-Tryptase apparently is trapped in this off-conformation by repulsions and attractions of the Asp216 side-chain. However, proteolytic activity could be generated by an induced-fit mechanism.
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<StructureSection load='1lto' size='340' side='right'caption='[[1lto]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1lto]] is a 4 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=1LTO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1LTO 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]] 2.2&#8491;</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=1lto FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1lto OCA], [https://pdbe.org/1lto PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1lto RCSB], [https://www.ebi.ac.uk/pdbsum/1lto PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1lto ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/TRYB1_HUMAN TRYB1_HUMAN] Tryptase is the major neutral protease present in mast cells and is secreted upon the coupled activation-degranulation response of this cell type (By similarity).
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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/lt/1lto_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=1lto 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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1LTO is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Active as [http://en.wikipedia.org/wiki/Tryptase Tryptase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.59 3.4.21.59] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LTO OCA].
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*[[Tryptase|Tryptase]]
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__TOC__
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==Reference==
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</StructureSection>
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The crystal structure of human alpha1-tryptase reveals a blocked substrate-binding region., Marquardt U, Zettl F, Huber R, Bode W, Sommerhoff C, J Mol Biol. 2002 Aug 16;321(3):491-502. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=12162961 12162961]
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[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Tryptase]]
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[[Category: Bode W]]
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[[Category: Bode, W.]]
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[[Category: Huber R]]
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[[Category: Huber, R.]]
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[[Category: Marquardt U]]
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[[Category: Marquardt, U.]]
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[[Category: Sommerhoff CP]]
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[[Category: Sommerhoff, C P.]]
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[[Category: Zettl F]]
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[[Category: Zettl, F.]]
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[[Category: hydrolase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:48:26 2008''
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Current revision

Human alpha1-tryptase

PDB ID 1lto

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