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New page: left|200px<br /><applet load="1sfi" size="450" color="white" frame="true" align="right" spinBox="true" caption="1sfi, resolution 1.65Å" /> '''HIGH RESOLUTION STRU... |
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== | ==High resolution structure of a potent, cyclic protease inhibitor from sunflower seeds== | ||
Proteinaceous serine proteinase inhibitors are widespread throughout the | <StructureSection load='1sfi' size='340' side='right'caption='[[1sfi]], [[Resolution|resolution]] 1.65Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1sfi]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Bos_taurus Bos taurus] and [https://en.wikipedia.org/wiki/Helianthus_annuus Helianthus annuus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SFI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1SFI 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]] 1.65Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</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=1sfi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1sfi OCA], [https://pdbe.org/1sfi PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1sfi RCSB], [https://www.ebi.ac.uk/pdbsum/1sfi PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1sfi ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/TRY1_BOVIN TRY1_BOVIN] | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/sf/1sfi_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</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=1sfi ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Proteinaceous serine proteinase inhibitors are widespread throughout the plant kingdom where they play an important role in protection against pests and pathogens. Here, we describe the isolation and characterisation of a novel 14 amino acid residue cyclic peptide from sunflower seeds, which is a potent inhibitor of trypsin (Ki=100 pM). The crystal structure of this peptide in complex with bovine beta-trypsin shows both sequence and conformational similarity with the trypsin-reactive loop of the Bowman-Birk family of serine proteinase inhibitors. This inhibitor, however, is unique in being monofunctional, cyclic and far shorter (14 amino acid residues) than inhibitors belonging to this family (typically 60-70 amino acid residues). The high potency of this peptide is likely to arise from the considerable structural rigidity achieved through its cyclic nature which is further stabilised by a single internal disulphide bond. This study helps delineate the minimal unit required for effective peptide inhibitors of serine proteinases, and will assist in the further design of inhibitors to this widespread class of enzymes. | |||
High-resolution structure of a potent, cyclic proteinase inhibitor from sunflower seeds.,Luckett S, Garcia RS, Barker JJ, Konarev AV, Shewry PR, Clarke AR, Brady RL J Mol Biol. 1999 Jul 9;290(2):525-33. PMID:10390350<ref>PMID:10390350</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1sfi" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Trypsin 3D structures|Trypsin 3D structures]] | |||
*[[Trypsin inhibitor 3D structures|Trypsin inhibitor 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Bos taurus]] | [[Category: Bos taurus]] | ||
[[Category: Helianthus annuus]] | [[Category: Helianthus annuus]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Barker JJ]] | |||
[[Category: Barker | [[Category: Brady RL]] | ||
[[Category: Brady | [[Category: Clarke AR]] | ||
[[Category: Clarke | [[Category: Garcia RS]] | ||
[[Category: Garcia | [[Category: Konarev AV]] | ||
[[Category: Konarev | [[Category: Luckett S]] | ||
[[Category: Luckett | [[Category: Shewry P]] | ||
[[Category: Shewry | |||
Latest revision as of 10:23, 30 October 2024
High resolution structure of a potent, cyclic protease inhibitor from sunflower seedsHigh resolution structure of a potent, cyclic protease inhibitor from sunflower seeds
Structural highlights
FunctionEvolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedProteinaceous serine proteinase inhibitors are widespread throughout the plant kingdom where they play an important role in protection against pests and pathogens. Here, we describe the isolation and characterisation of a novel 14 amino acid residue cyclic peptide from sunflower seeds, which is a potent inhibitor of trypsin (Ki=100 pM). The crystal structure of this peptide in complex with bovine beta-trypsin shows both sequence and conformational similarity with the trypsin-reactive loop of the Bowman-Birk family of serine proteinase inhibitors. This inhibitor, however, is unique in being monofunctional, cyclic and far shorter (14 amino acid residues) than inhibitors belonging to this family (typically 60-70 amino acid residues). The high potency of this peptide is likely to arise from the considerable structural rigidity achieved through its cyclic nature which is further stabilised by a single internal disulphide bond. This study helps delineate the minimal unit required for effective peptide inhibitors of serine proteinases, and will assist in the further design of inhibitors to this widespread class of enzymes. High-resolution structure of a potent, cyclic proteinase inhibitor from sunflower seeds.,Luckett S, Garcia RS, Barker JJ, Konarev AV, Shewry PR, Clarke AR, Brady RL J Mol Biol. 1999 Jul 9;290(2):525-33. PMID:10390350[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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