View source for 4gaw


==Crystal structure of active human granzyme H==
<StructureSection load='4gaw' size='340' side='right'caption='[[4gaw]], [[Resolution|resolution]] 3.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4gaw]] is a 12 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=4GAW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4GAW FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></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=4gaw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4gaw OCA], [https://pdbe.org/4gaw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4gaw RCSB], [https://www.ebi.ac.uk/pdbsum/4gaw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4gaw ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/GRAH_HUMAN GRAH_HUMAN] Cytotoxic chymotrypsin-like serine protease with preference for bulky and aromatic residues at the P1 position and acidic residues at the P3' and P4' sites. Probably necessary for target cell lysis in cell-mediated immune responses. Participates in the antiviral response via direct cleavage of several proteins essential for viral replication.<ref>PMID:22156497</ref> <ref>PMID:23269243</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The granzyme/perforin pathway is a major mechanism for cytotoxic lymphocytes to eliminate virus-infected and tumor cells. The balance between activation and inhibition of the proteolytic cascade must be tightly controlled to avoid self damage. Granzyme H (GzmH) is constitutively expressed in NK cells and induces target cell death; however, how GzmH activity is regulated remains elusive. We reported earlier the crystal structures of inactive D102N-GzmH alone and in complex with its synthetic substrate and inhibitor, as well as defined the mechanisms of substrate recognition and enzymatic activation. In this study, we identified SERPINB1 as a potent intracellular inhibitor for GzmH. Upon cleavage of the reactive center loop at Phe(343), SERPINB1 forms an SDS-stable covalent complex with GzmH. SERPINB1 overexpression suppresses GzmH- or LAK cell-mediated cytotoxicity. We determined the crystal structures of active GzmH and SERPINB1 (LM-DD mutant) in the native conformation to 3.0- and 2.9-A resolution, respectively. Molecular modeling reveals the possible conformational changes in GzmH for the suicide inhibition. Our findings provide new insights into the inhibitory mechanism of SERPINB1 against human GzmH.

Identification of SERPINB1 As a Physiological Inhibitor of Human Granzyme H.,Wang L, Li Q, Wu L, Liu S, Zhang Y, Yang X, Zhu P, Zhang H, Zhang K, Lou J, Liu P, Tong L, Sun F, Fan Z J Immunol. 2012 Dec 26. PMID:23269243<ref>PMID:23269243</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4gaw" style="background-color:#fffaf0;"></div>

==See Also==
*[[Granzyme|Granzyme]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Fan Z]]
[[Category: Li Q]]
[[Category: Sun F]]
[[Category: Tong L]]
[[Category: Wang L]]
[[Category: Wu L]]
[[Category: Zhang K]]