1mnk: Difference between revisions

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<StructureSection load='1mnk' size='340' side='right'caption='[[1mnk]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
<StructureSection load='1mnk' size='340' side='right'caption='[[1mnk]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1mnk]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Pig Pig]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MNK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1MNK FirstGlance]. <br>
<table><tr><td colspan='2'>[[1mnk]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Sus_scrofa Sus scrofa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MNK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1MNK FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.2&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</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=1mnk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mnk OCA], [https://pdbe.org/1mnk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1mnk RCSB], [https://www.ebi.ac.uk/pdbsum/1mnk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1mnk ProSAT]</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=1mnk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mnk OCA], [https://pdbe.org/1mnk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1mnk RCSB], [https://www.ebi.ac.uk/pdbsum/1mnk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1mnk ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[https://www.uniprot.org/uniprot/MYG_PIG MYG_PIG]] Serves as a reserve supply of oxygen and facilitates the movement of oxygen within muscles.  
[https://www.uniprot.org/uniprot/MYG_PIG MYG_PIG] Serves as a reserve supply of oxygen and facilitates the movement of oxygen within muscles.
== Evolutionary Conservation ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
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</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=1mnk ConSurf].
</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=1mnk ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Site-directed mutations have been introduced singly and in combination at residues lysine/arginine45 (CD3), histidine64 (E7), threonine67 (E10), and valine68 (E11) in pig and sperm whale myoglobins. The mutations probe the roles of these key distal pocket residues and represent attempts to mimic the heme environment of Aplysia limacina myoglobin which achieves moderately high O2 affinity in the absence of a distal histidine. In the mollusc myoglobin, arginine-E10 is believed to swing into the heme pocket and provide a hydrogen bond to the bound O2. The association and dissociation rate constants for oxygen and carbon monoxide binding to H64V, T67A, T67V, T67E, T67R, V68I, V68T, H64V-T67R, H64V-V68T, H64V-V68I, and H64V-T67R-V68I pig myoglobin mutants and T67R, H64V-T67R, and R45D-H64V-T67R mutants of sperm whale myoglobin have been measured using stopped-flow rapid mixing and flash photolysis techniques. Replacement of histidine-E7 with valine in either pig or sperm whale myoglobin drastically lowers O2 affinity while increasing CO affinity. Two second-site mutations, T67R and V68T, increase O2 affinity in the H64V mutant, even though when introduced singly these mutations have no effect or lower KO2, respectively. However, the oxygen affinities of the H64V-T67R mutants are 5-10-fold lower than that of A. limacina myoglobin. The crystal structure of the pig H64V-T67R double mutant reveals that the valine-E7 side chain is approximately 1 A closer to the heme plane than in the mollusc protein which may restrict access of the arginine-E10 side chain into the heme pocket. The O2 affinity of the H64V-T67R double mutant is not altered by the R45D replacement but is reduced 10-fold by the V68I mutation. The interactive effects of the T67R, V68I, and V68T mutations with the H64V substitution are discussed in terms of O2, CO, and N3-binding and the crystal structures of the H64V-T67R, H64V-V68I, and H64V-V68T double-mutant proteins. In many instances, the effects of second-site mutations in the valine64 background are the opposite of those observed for the corresponding single mutations in the wild type background. These results can be understood in terms of the changes in the rate-determining steps for ligand association and dissociation and the loss of distal pocket water molecules which follow replacement of histidine64 by valine.
Interactions among residues CD3, E7, E10, and E11 in myoglobins: attempts to simulate the ligand-binding properties of Aplysia myoglobin.,Smerdon SJ, Krzywda S, Brzozowski AM, Davies GJ, Wilkinson AJ, Brancaccio A, Cutruzzola F, Allocatelli CT, Brunori M, Li T, et al. Biochemistry. 1995 Jul 11;34(27):8715-25. PMID:7612611<ref>PMID:7612611</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1mnk" style="background-color:#fffaf0;"></div>


==See Also==
==See Also==
*[[Myoglobin 3D structures|Myoglobin 3D structures]]
*[[Myoglobin 3D structures|Myoglobin 3D structures]]
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Pig]]
[[Category: Sus scrofa]]
[[Category: Krzywda, S]]
[[Category: Krzywda S]]
[[Category: Wilkinson, A J]]
[[Category: Wilkinson AJ]]
[[Category: Oxygen storage]]

Latest revision as of 10:46, 14 February 2024

INTERACTIONS AMONG RESIDUES CD3, E7, E10 AND E11 IN MYOGLOBINS: ATTEMPTS TO SIMULATE THE O2 AND CO BINDING PROPERTIES OF APLYSIA MYOGLOBININTERACTIONS AMONG RESIDUES CD3, E7, E10 AND E11 IN MYOGLOBINS: ATTEMPTS TO SIMULATE THE O2 AND CO BINDING PROPERTIES OF APLYSIA MYOGLOBIN

Structural highlights

1mnk is a 2 chain structure with sequence from Sus scrofa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2.2Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

MYG_PIG 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.

See Also

1mnk, resolution 2.20Å

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