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New page: left|200px<br /><applet load="1do7" size="450" color="white" frame="true" align="right" spinBox="true" caption="1do7, resolution 1.85Å" /> '''CARBONMONOXY-MYOGLOB... |
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== | ==CARBONMONOXY-MYOGLOBIN (MUTANT L29W) REBINDING STRUCTURE AFTER PHOTOLYSIS AT T< 180K== | ||
Myoglobin, a small globular haem protein that binds gaseous ligands such | <StructureSection load='1do7' size='340' side='right'caption='[[1do7]], [[Resolution|resolution]] 1.85Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1do7]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Physeter_catodon Physeter catodon]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DO7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1DO7 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]] 1.85Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CMO:CARBON+MONOXIDE'>CMO</scene>, <scene name='pdbligand=FME:N-FORMYLMETHIONINE'>FME</scene>, <scene name='pdbligand=GLC:ALPHA-D-GLUCOSE'>GLC</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=PRD_900006:trehalose'>PRD_900006</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=1do7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1do7 OCA], [https://pdbe.org/1do7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1do7 RCSB], [https://www.ebi.ac.uk/pdbsum/1do7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1do7 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/MYG_PHYMC MYG_PHYMC] Serves as a reserve supply of oxygen and facilitates the movement of oxygen within muscles. | |||
== 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/do/1do7_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=1do7 ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Myoglobin, a small globular haem protein that binds gaseous ligands such as O2, CO and NO reversibly at the haem iron, serves as a model for studying structural and dynamic aspects of protein reactions. Time-resolved spectroscopic measurements after photodissociation of the ligand revealed a complex ligand-binding reaction with multiple kinetic intermediates, resulting from protein relaxation and movements of the ligand within the protein. To observe the structural changes induced by ligand dissociation, we have carried out X-ray crystallographic investigations of carbon monoxy-myoglobin (MbCO mutant L29W) crystals illuminated below and above 180 K, complemented by time-resolved infrared spectroscopy of CO rebinding. Here we show that below 180 K photodissociated ligands migrate to specific sites within an internal cavity--the distal haem pocket--of an essentially immobilized, frozen protein, from where they subsequently rebind by thermally activated barrier crossing. Upon photodissociation above 180 K, ligands escape from the distal pocket, aided by protein fluctuations that transiently open exit channels. We recover most of the ligands in a cavity on the opposite side of the haem group. | |||
Ligand binding and conformational motions in myoglobin.,Ostermann A, Waschipky R, Parak FG, Nienhaus GU Nature. 2000 Mar 9;404(6774):205-8. PMID:10724176<ref>PMID:10724176</ref> | |||
== | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | |||
<div class="pdbe-citations 1do7" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Myoglobin 3D structures|Myoglobin 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Physeter catodon]] | [[Category: Physeter catodon]] | ||
[[Category: Nienhaus GU]] | |||
[[Category: Nienhaus | [[Category: Ostermann A]] | ||
[[Category: Ostermann | [[Category: Parak FG]] | ||
[[Category: Parak | [[Category: Waschipky R]] | ||
[[Category: Waschipky | |||
Latest revision as of 09:32, 30 October 2024
CARBONMONOXY-MYOGLOBIN (MUTANT L29W) REBINDING STRUCTURE AFTER PHOTOLYSIS AT T< 180KCARBONMONOXY-MYOGLOBIN (MUTANT L29W) REBINDING STRUCTURE AFTER PHOTOLYSIS AT T< 180K
Structural highlights
FunctionMYG_PHYMC Serves as a reserve supply of oxygen and facilitates the movement of oxygen within muscles. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedMyoglobin, a small globular haem protein that binds gaseous ligands such as O2, CO and NO reversibly at the haem iron, serves as a model for studying structural and dynamic aspects of protein reactions. Time-resolved spectroscopic measurements after photodissociation of the ligand revealed a complex ligand-binding reaction with multiple kinetic intermediates, resulting from protein relaxation and movements of the ligand within the protein. To observe the structural changes induced by ligand dissociation, we have carried out X-ray crystallographic investigations of carbon monoxy-myoglobin (MbCO mutant L29W) crystals illuminated below and above 180 K, complemented by time-resolved infrared spectroscopy of CO rebinding. Here we show that below 180 K photodissociated ligands migrate to specific sites within an internal cavity--the distal haem pocket--of an essentially immobilized, frozen protein, from where they subsequently rebind by thermally activated barrier crossing. Upon photodissociation above 180 K, ligands escape from the distal pocket, aided by protein fluctuations that transiently open exit channels. We recover most of the ligands in a cavity on the opposite side of the haem group. Ligand binding and conformational motions in myoglobin.,Ostermann A, Waschipky R, Parak FG, Nienhaus GU Nature. 2000 Mar 9;404(6774):205-8. PMID:10724176[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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