4i8h: Difference between revisions
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==Bovine trypsin at 0.75 resolution== | |||
=== | <StructureSection load='4i8h' size='340' side='right' caption='[[4i8h]], [[Resolution|resolution]] 0.75Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[4i8h]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4I8H OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4I8H FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=BEN:BENZAMIDINE'>BEN</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | |||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4i8g|4i8g]], [[4i8j|4i8j]], [[4i8k|4i8k]], [[4i8l|4i8l]]</td></tr> | |||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Trypsin Trypsin], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.4 3.4.21.4] </span></td></tr> | |||
<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=4i8h FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4i8h OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4i8h RCSB], [http://www.ebi.ac.uk/pdbsum/4i8h PDBsum]</span></td></tr> | |||
</table> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Structural studies of proteins usually rely on a model obtained from one crystal. By investigating the details of this model, crystallographers seek to obtain insight into the function of the macromolecule. It is therefore important to know which details of a protein structure are reproducible or to what extent they might differ. To address this question, the high-resolution structures of five crystals of bovine trypsin obtained under analogous conditions were compared. Global parameters and structural details were investigated. All of the models were of similar quality and the pairwise merged intensities had large correlation coefficients. The C(alpha) and backbone atoms of the structures superposed very well. The occupancy of ligands in regions of low thermal motion was reproducible, whereas solvent molecules containing heavier atoms (such as sulfur) or those located on the surface could differ significantly. The coordination lengths of the calcium ion were conserved. A large proportion of the multiple conformations refined to similar occupancies and the residues adopted similar orientations. More than three quarters of the water-molecule sites were conserved within 0.5 A and more than one third were conserved within 0.1 A. An investigation of the protonation states of histidine residues and carboxylate moieties was consistent for all of the models. Radiation-damage effects to disulfide bridges were observed for the same residues and to similar extents. Main-chain bond lengths and angles averaged to similar values and were in agreement with the Engh and Huber targets. Other features, such as peptide flips and the double conformation of the inhibitor molecule, were also reproducible in all of the trypsin structures. Therefore, many details are similar in models obtained from different crystals. However, several features of residues or ligands located in flexible parts of the macromolecule may vary significantly, such as side-chain orientations and the occupancies of certain fragments. | |||
On the reproducibility of protein crystal structures: five atomic resolution structures of trypsin.,Liebschner D, Dauter M, Brzuszkiewicz A, Dauter Z Acta Crystallogr D Biol Crystallogr. 2013 Aug;69(Pt 8):1447-62. doi:, 10.1107/S0907444913009050. Epub 2013 Jul 17. PMID:23897468<ref>PMID:23897468</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
==See Also== | ==See Also== | ||
*[[Trypsin|Trypsin]] | *[[Trypsin|Trypsin]] | ||
== References == | |||
== | <references/> | ||
__TOC__ | |||
</StructureSection> | |||
[[Category: Bos taurus]] | [[Category: Bos taurus]] | ||
[[Category: Trypsin]] | [[Category: Trypsin]] | ||
[[Category: Brzuszkiewicz, A | [[Category: Brzuszkiewicz, A]] | ||
[[Category: Dauter, M | [[Category: Dauter, M]] | ||
[[Category: Dauter, Z | [[Category: Dauter, Z]] | ||
[[Category: Liebschner, D | [[Category: Liebschner, D]] | ||
[[Category: Hydrolase]] | [[Category: Hydrolase]] | ||
[[Category: Serine protease]] | [[Category: Serine protease]] | ||