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==Perdeuterated hen egg-white lysozyme at 100 K== | ==Perdeuterated hen egg-white lysozyme at 100 K== | ||
<StructureSection load='7avg' size='340' side='right'caption='[[7avg]]' scene=''> | <StructureSection load='7avg' size='340' side='right'caption='[[7avg]], [[Resolution|resolution]] 1.00Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7AVG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7AVG FirstGlance]. <br> | <table><tr><td colspan='2'>[[7avg]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Chick Chick]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7AVG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7AVG FirstGlance]. <br> | ||
</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=7avg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7avg OCA], [https://pdbe.org/7avg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7avg RCSB], [https://www.ebi.ac.uk/pdbsum/7avg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7avg ProSAT]</span></td></tr> | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=NO3:NITRATE+ION'>NO3</scene></td></tr> | ||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Lysozyme Lysozyme], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.17 3.2.1.17] </span></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=7avg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7avg OCA], [https://pdbe.org/7avg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7avg RCSB], [https://www.ebi.ac.uk/pdbsum/7avg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7avg ProSAT]</span></td></tr> | |||
</table> | </table> | ||
== Function == | |||
[[https://www.uniprot.org/uniprot/LYSC_CHICK LYSC_CHICK]] Lysozymes have primarily a bacteriolytic function; those in tissues and body fluids are associated with the monocyte-macrophage system and enhance the activity of immunoagents. Has bacteriolytic activity against M.luteus.<ref>PMID:22044478</ref> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
This structural and biophysical study exploited a method of perdeuterating hen egg-white lysozyme based on the expression of insoluble protein in Escherichia coli followed by in-column chemical refolding. This allowed detailed comparisons with perdeuterated lysozyme produced in the yeast Pichia pastoris, as well as with unlabelled lysozyme. Both perdeuterated variants exhibit reduced thermal stability and enzymatic activity in comparison with hydrogenated lysozyme. The thermal stability of refolded perdeuterated lysozyme is 4.9 degrees C lower than that of the perdeuterated variant expressed and secreted in yeast and 6.8 degrees C lower than that of the hydrogenated Gallus gallus protein. However, both perdeuterated variants exhibit a comparable activity. Atomic resolution X-ray crystallographic analyses show that the differences in thermal stability and enzymatic function are correlated with refolding and deuteration effects. The hydrogen/deuterium isotope effect causes a decrease in the stability and activity of the perdeuterated analogues; this is believed to occur through a combination of changes to hydrophobicity and protein dynamics. The lower level of thermal stability of the refolded perdeuterated lysozyme is caused by the unrestrained Asn103 peptide-plane flip during the unfolded state, leading to a significant increase in disorder of the Lys97-Gly104 region following subsequent refolding. An ancillary outcome of this study has been the development of an efficient and financially viable protocol that allows stable and active perdeuterated lysozyme to be more easily available for scientific applications. | |||
Structural insights into protein folding, stability and activity using in vivo perdeuteration of hen egg-white lysozyme.,Ramos J, Laux V, Haertlein M, Boeri Erba E, McAuley KE, Forsyth VT, Mossou E, Larsen S, Langkilde AE IUCrJ. 2021 Mar 6;8(Pt 3):372-386. doi: 10.1107/S2052252521001299. eCollection, 2021 May 1. PMID:33953924<ref>PMID:33953924</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 7avg" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: Chick]] | |||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
[[Category: | [[Category: Lysozyme]] | ||
[[Category: Forsyth | [[Category: Boeri, E Erba]] | ||
[[Category: Haertlein M]] | [[Category: Forsyth, V T]] | ||
[[Category: Langkilde | [[Category: Haertlein, M]] | ||
[[Category: Larsen S]] | [[Category: Langkilde, A E]] | ||
[[Category: Laux V]] | [[Category: Larsen, S]] | ||
[[Category: Mossou E]] | [[Category: Laux, V]] | ||
[[Category: Ramos J]] | [[Category: Mossou, E]] | ||
[[Category: Ramos, J]] | |||
[[Category: Hewl]] | |||
[[Category: Hydrolase]] | |||
[[Category: Perdeuterated]] | |||
Revision as of 13:21, 19 May 2021
Perdeuterated hen egg-white lysozyme at 100 KPerdeuterated hen egg-white lysozyme at 100 K
Structural highlights
Function[LYSC_CHICK] Lysozymes have primarily a bacteriolytic function; those in tissues and body fluids are associated with the monocyte-macrophage system and enhance the activity of immunoagents. Has bacteriolytic activity against M.luteus.[1] Publication Abstract from PubMedThis structural and biophysical study exploited a method of perdeuterating hen egg-white lysozyme based on the expression of insoluble protein in Escherichia coli followed by in-column chemical refolding. This allowed detailed comparisons with perdeuterated lysozyme produced in the yeast Pichia pastoris, as well as with unlabelled lysozyme. Both perdeuterated variants exhibit reduced thermal stability and enzymatic activity in comparison with hydrogenated lysozyme. The thermal stability of refolded perdeuterated lysozyme is 4.9 degrees C lower than that of the perdeuterated variant expressed and secreted in yeast and 6.8 degrees C lower than that of the hydrogenated Gallus gallus protein. However, both perdeuterated variants exhibit a comparable activity. Atomic resolution X-ray crystallographic analyses show that the differences in thermal stability and enzymatic function are correlated with refolding and deuteration effects. The hydrogen/deuterium isotope effect causes a decrease in the stability and activity of the perdeuterated analogues; this is believed to occur through a combination of changes to hydrophobicity and protein dynamics. The lower level of thermal stability of the refolded perdeuterated lysozyme is caused by the unrestrained Asn103 peptide-plane flip during the unfolded state, leading to a significant increase in disorder of the Lys97-Gly104 region following subsequent refolding. An ancillary outcome of this study has been the development of an efficient and financially viable protocol that allows stable and active perdeuterated lysozyme to be more easily available for scientific applications. Structural insights into protein folding, stability and activity using in vivo perdeuteration of hen egg-white lysozyme.,Ramos J, Laux V, Haertlein M, Boeri Erba E, McAuley KE, Forsyth VT, Mossou E, Larsen S, Langkilde AE IUCrJ. 2021 Mar 6;8(Pt 3):372-386. doi: 10.1107/S2052252521001299. eCollection, 2021 May 1. PMID:33953924[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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