4kel: Difference between revisions
New page: '''Unreleased structure''' The entry 4kel is ON HOLD Authors: Ilyichova, O.V., Swedberg, J.E., de Veer, S.J., Sit, K.C., Harris, J.M., Buckle, A.M. Description: Atomic resolution cryst... |
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The | ==Atomic resolution crystal structure of Kallikrein-Related Peptidase 4 complexed with a modified SFTI inhibitor FCQR(N)== | ||
<StructureSection load='4kel' size='340' side='right'caption='[[4kel]], [[Resolution|resolution]] 1.15Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[4kel]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Helianthus_annuus Helianthus annuus] and [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4KEL OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4KEL 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]] 1.148Å</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=4kel FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4kel OCA], [https://pdbe.org/4kel PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4kel RCSB], [https://www.ebi.ac.uk/pdbsum/4kel PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4kel ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/SFTI1_HELAN SFTI1_HELAN] Inhibits trypsin, cathepsin G, elastase, chymotrypsin and thrombin. Does not inhibit factor Xa.<ref>PMID:10390350</ref> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Sunflower trypsin inhibitor (SFTI-1) is a 14 amino acid serine protease inhibitor. The dual antiparallel beta-sheet arrangement of SFTI-1 is stabilized by an N-terminal-C-terminal backbone cyclization and a further disulfide bridge to form a final bicyclic structure. This constrained structure is further rigidified by an extensive network of internal hydrogen bonds. Thus, the structure of SFTI-1 in solution resembles the protease-bound structure, reducing the entropic penalty upon protease binding. When cleaved at the scissile bond, it is thought that the rigidifying features of SFTI-1 maintain its structure, allowing the scissile bond to be reformed. The lack of structural plasticity for SFTI-1 is proposed to favor initial protease binding and continued occupancy in the protease active site, resulting in an equilibrium between the cleaved and uncleaved inhibitor in the presence of a protease. We have determined, at 1.15 A resolution, the X-ray crystal structures of complexes between human kallikrein-related peptidase 4 (KLK4) and SFTI-FCQR(Asn14) and between KLK4 and an acyclic form of the same inhibitor, SFTI-FCQR(Asn14)[1,14], with the latter displaying a cleaved scissile bond. Structural analysis and MD simulations together reveal the roles of the altered contact sequence, intramolecular hydrogen bonding network, and backbone cyclization in altering the state of SFTI's scissile bond ligation at the protease active site. Taken together, the data presented reveal insights into the role of dynamics in the standard-mechanism inhibition and suggest that modifications on the non-contact strand may be a useful, underexplored approach for generating further potent or selective SFTI-based inhibitors against members of the serine protease family. | |||
KLK4 Inhibition by Cyclic and Acyclic Peptides: Structural and Dynamical Insights into Standard-Mechanism Protease Inhibitors.,Riley BT, Ilyichova O, de Veer SJ, Swedberg JE, Wilson E, Hoke DE, Harris JM, Buckle AM Biochemistry. 2019 May 28;58(21):2524-2533. doi: 10.1021/acs.biochem.9b00191., Epub 2019 May 13. PMID:31058493<ref>PMID:31058493</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 4kel" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Kallikrein 3D structures|Kallikrein 3D structures]] | |||
*[[Trypsin inhibitor 3D structures|Trypsin inhibitor 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Helianthus annuus]] | |||
[[Category: Homo sapiens]] | |||
[[Category: Large Structures]] | |||
[[Category: Buckle AM]] | |||
[[Category: Harris JM]] | |||
[[Category: Ilyichova OV]] | |||
[[Category: Sit KC]] | |||
[[Category: Swedberg JE]] | |||
[[Category: De Veer SJ]] | |||