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| ==The crystal structure of human Plasma Kallikrein in complex with its peptide inhibitor pkalin-1==
| | #REDIRECT [[5f8z]] This PDB entry is obsolete and replaced by 5f8z |
| <StructureSection load='4zj4' size='340' side='right' caption='[[4zj4]], [[Resolution|resolution]] 1.50Å' scene=''>
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| == Structural highlights ==
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| <table><tr><td colspan='2'>[[4zj4]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4ZJ4 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4ZJ4 FirstGlance]. <br>
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| </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MRZ:PIPERIDINE-1-CARBOXIMIDAMIDE'>MRZ</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
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| <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Plasma_kallikrein Plasma kallikrein], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.34 3.4.21.34] </span></td></tr>
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| <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4zj4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4zj4 OCA], [http://pdbe.org/4zj4 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4zj4 RCSB], [http://www.ebi.ac.uk/pdbsum/4zj4 PDBsum]</span></td></tr>
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| </table>
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| == Disease ==
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| [[http://www.uniprot.org/uniprot/KLKB1_HUMAN KLKB1_HUMAN]] Defects in KLKB1 are the cause of prekallikrein deficiency (PKK deficiency) [MIM:[http://omim.org/entry/612423 612423]]; also known as Fletcher factor deficiency. This disorder is a blood coagulation defect.
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| == Function ==
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| [[http://www.uniprot.org/uniprot/KLKB1_HUMAN KLKB1_HUMAN]] The enzyme cleaves Lys-Arg and Arg-Ser bonds. It activates, in a reciprocal reaction, factor XII after its binding to a negatively charged surface. It also releases bradykinin from HMW kininogen and may also play a role in the renin-angiotensin system by converting prorenin into renin.
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| <div style="background-color:#fffaf0;">
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| == Publication Abstract from PubMed ==
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| All serine proteases hydrolyze peptide bonds by the same basic mechanism and have very similar active sites, in spite of the fact that individual proteases have different physiological functions. We here report a strategy for designing high-affinity and high-specificity serine protease inhibitors using a versatile peptide scaffold, a 10-mer peptide, mupain-1 (CPAYSRYLDC). Mupain-1 was previously reported as a specific inhibitor of murine urokinase-type plasminogen activator (Ki = 0.55 muM) without measurable affinity to plasma kallikrein (Ki > 1000 muM). On the basis of a structure-based rational design, we substituted five residues of mupain-1 and converted it to a potent plasma kallikrein inhibitor (Ki = 0.014 muM). X-ray crystal structure analysis showed that the new peptide was able to adapt a new set of enzyme surface interactions by a slightly changed backbone conformation. Thus, with an appropriate re-engineering, mupain-1 can be redesigned to specific inhibitors of other serine proteases.
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| Design of Specific Serine Protease Inhibitors Based on a Versatile Peptide Scaffold: Conversion of a Urokinase Inhibitor to a Plasma Kallikrein Inhibitor.,Xu P, Xu M, Jiang L, Yang Q, Luo Z, Dauter Z, Huang M, Andreasen PA J Med Chem. 2015 Nov 25;58(22):8868-76. doi: 10.1021/acs.jmedchem.5b01128. Epub, 2015 Nov 12. PMID:26536069<ref>PMID:26536069</ref>
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| From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
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| </div>
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| <div class="pdbe-citations 4zj4" style="background-color:#fffaf0;"></div>
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| == References ==
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| <references/>
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| __TOC__
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| </StructureSection>
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| [[Category: Plasma kallikrein]]
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| [[Category: Andreasen, P]]
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| [[Category: Huang, M]]
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| [[Category: Jiang, L]]
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| [[Category: Luo, Z]]
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| [[Category: Xu, M]]
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| [[Category: Xu, P]]
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| [[Category: Hydrolase-hydrolase inhibitor]]
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| [[Category: Peptide inhibitor]]
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This PDB entry is obsolete and replaced by 5f8z