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==Crystal Structure of the Bowman-Birk Inhibitor from Vigna unguiculata Seeds in Complex with Beta-trypsin at 1.55 Angstrons Resolution== | |||
<StructureSection load='2g81' size='340' side='right'caption='[[2g81]], [[Resolution|resolution]] 1.55Å' scene=''> | |||
| | == Structural highlights == | ||
<table><tr><td colspan='2'>[[2g81]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Bos_taurus Bos taurus] and [https://en.wikipedia.org/wiki/Vigna_unguiculata Vigna unguiculata]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2G81 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2G81 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]] 1.55Å</td></tr> | ||
| | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACY:ACETIC+ACID'>ACY</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=P6G:HEXAETHYLENE+GLYCOL'>P6G</scene>, <scene name='pdbligand=PGE:TRIETHYLENE+GLYCOL'>PGE</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=2g81 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2g81 OCA], [https://pdbe.org/2g81 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2g81 RCSB], [https://www.ebi.ac.uk/pdbsum/2g81 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2g81 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/Q9S9H8_VIGUN Q9S9H8_VIGUN] | |||
== 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/g8/2g81_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=2g81 ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The structure of the Bowman-Birk inhibitor from Vigna unguiculata seeds (BTCI) in complex with beta-trypsin was solved and refined at 1.55 A to a crystallographic R(factor) of 0.154 and R(free) of 0.169, and represents the highest resolution for a Bowman-Birk inhibitor structure to date. The BTCI-trypsin interface is stabilized by hydrophobic contacts and hydrogen bonds, involving two waters and a polyethylene glycol molecule. The conformational rigidity of the reactive loop is characteristic of the specificity against trypsin, while hydrophobicity and conformational mobility of the antichymotryptic subdomain confer the self-association tendency, indicated by atomic force microscopy, of BTCI in complex and free form. When BTCI is in binary complexes, no significant differences in inhibition constants for producing a ternary complex with trypsin and chymotrypsin were detected. These results indicate that binary complexes present no conformational change in their reactive site for both enzymes confirming that these sites are structurally independent. The free chymotrypsin observed in the atomic force microscopy assays, when the ternary complex is obtained from BTCI-trypsin binary complex and chymotrypsin, could be related more to the self-association tendency between chymotrypsin molecules and the flexibility of the reactive site for this enzyme than to binding-related conformational changes. | |||
Crystal structure of the Bowman-Birk Inhibitor from Vigna unguiculata seeds in complex with beta-trypsin at 1.55 A resolution and its structural properties in association with proteinases.,Barbosa JA, Silva LP, Teles RC, Esteves GF, Azevedo RB, Ventura MM, de Freitas SM Biophys J. 2007 Mar 1;92(5):1638-50. Epub 2006 Dec 1. PMID:17142290<ref>PMID:17142290</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 2g81" 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: | [[Category: Large Structures]] | ||
[[Category: Vigna unguiculata]] | [[Category: Vigna unguiculata]] | ||
[[Category: Barbosa | [[Category: Barbosa JARG]] | ||
[[Category: Esteves | [[Category: Esteves GF]] | ||
[[Category: Freitas | [[Category: Freitas SM]] | ||
[[Category: Paulino | [[Category: Paulino LS]] | ||
[[Category: Teles | [[Category: Teles RCL]] | ||
[[Category: Ventura | [[Category: Ventura MM]] | ||
Latest revision as of 03:57, 21 November 2024
Crystal Structure of the Bowman-Birk Inhibitor from Vigna unguiculata Seeds in Complex with Beta-trypsin at 1.55 Angstrons ResolutionCrystal Structure of the Bowman-Birk Inhibitor from Vigna unguiculata Seeds in Complex with Beta-trypsin at 1.55 Angstrons Resolution
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 PubMedThe structure of the Bowman-Birk inhibitor from Vigna unguiculata seeds (BTCI) in complex with beta-trypsin was solved and refined at 1.55 A to a crystallographic R(factor) of 0.154 and R(free) of 0.169, and represents the highest resolution for a Bowman-Birk inhibitor structure to date. The BTCI-trypsin interface is stabilized by hydrophobic contacts and hydrogen bonds, involving two waters and a polyethylene glycol molecule. The conformational rigidity of the reactive loop is characteristic of the specificity against trypsin, while hydrophobicity and conformational mobility of the antichymotryptic subdomain confer the self-association tendency, indicated by atomic force microscopy, of BTCI in complex and free form. When BTCI is in binary complexes, no significant differences in inhibition constants for producing a ternary complex with trypsin and chymotrypsin were detected. These results indicate that binary complexes present no conformational change in their reactive site for both enzymes confirming that these sites are structurally independent. The free chymotrypsin observed in the atomic force microscopy assays, when the ternary complex is obtained from BTCI-trypsin binary complex and chymotrypsin, could be related more to the self-association tendency between chymotrypsin molecules and the flexibility of the reactive site for this enzyme than to binding-related conformational changes. Crystal structure of the Bowman-Birk Inhibitor from Vigna unguiculata seeds in complex with beta-trypsin at 1.55 A resolution and its structural properties in association with proteinases.,Barbosa JA, Silva LP, Teles RC, Esteves GF, Azevedo RB, Ventura MM, de Freitas SM Biophys J. 2007 Mar 1;92(5):1638-50. Epub 2006 Dec 1. PMID:17142290[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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