1xch: Difference between revisions

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== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1xch]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Equus_caballus Equus caballus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1XCH OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1XCH FirstGlance]. <br>
<table><tr><td colspan='2'>[[1xch]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Equus_caballus Equus caballus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1XCH OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1XCH 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>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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]] 1.7&#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>, <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=1xch FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1xch OCA], [https://pdbe.org/1xch PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1xch RCSB], [https://www.ebi.ac.uk/pdbsum/1xch PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1xch 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=1xch FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1xch OCA], [https://pdbe.org/1xch PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1xch RCSB], [https://www.ebi.ac.uk/pdbsum/1xch PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1xch ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[https://www.uniprot.org/uniprot/MYG_HORSE MYG_HORSE]] Serves as a reserve supply of oxygen and facilitates the movement of oxygen within muscles.  
[https://www.uniprot.org/uniprot/MYG_HORSE MYG_HORSE] 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=1xch 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=1xch ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Well-ordered internal amino acids can contribute significantly to the stability of proteins. To investigate the importance of the hydrophobic packing interface between helices G and H in the proximal heme pocket of horse heart myoglobin, the highly conserved amino acid, Leu104, was substituted with asparagine, a polar amino acid of similar size. The Leu104Asn mutant protein and its recombinant wild-type horse heart myoglobin counterpart were expressed from synthetic genes in Escherichia coli. Thermal denaturation of these two recombinant myoglobins, as studied by measurement of circular dichroism ellipticity at 222 nm, revealed that the Leu104Asn mutant had a significantly lower t(m) (71.8 +/- 1 degree C, pH 7.0) than recombinant wild-type myoglobin (81.3 +/- 1 degree C, pH 7.0). To examine the extent to which this 10 degrees C decrease in thermal stability was associated with structural perturbations, X-ray diffraction techniques were used to determine the three-dimensional structures of both the recombinant wild-type and Leu104Asn myoglobins to 0.17 nm resolution. Refinement of these structures gave final crystallographic R-factors of 16.0% and 17.9%, respectively. Structural comparison of the natural and recombinant wild-type myoglobins, together with absorption spectroscopic and electron paramagnetic resonance (EPR) analyses, confirmed the proper expression and folding of the recombinant protein in E. coli. Surprisingly, despite the decreased thermal stability of the Leu104Asn mutant, there are no significant structural differences between the mutant and wild-type myoglobins. EPR and absorption spectroscopic analyses further confirmed the similar nature of the heme iron centres in both proteins. Thus, the introduction of an energetically unfavourable change in side chain polarity at position 104 into a hydrophobic environment that does not support the hydrogen bonding potential of the mutant asparagine appears to perturb important stabilizing helix-helix and heme-protein interactions. The induced structural destabilization is thereby reflected by a significant decrease in the t(m) of horse heart myoglobin.
A myoglobin variant with a polar substitution in a conserved hydrophobic cluster in the heme binding pocket.,Maurus R, Overall CM, Bogumil R, Luo Y, Mauk AG, Smith M, Brayer GD Biochim Biophys Acta. 1997 Aug 15;1341(1):1-13. PMID:9300804<ref>PMID:9300804</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1xch" 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: Equus caballus]]
[[Category: Equus caballus]]
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Brayer, G D]]
[[Category: Brayer GD]]
[[Category: Maurus, R]]
[[Category: Maurus R]]
[[Category: Heme]]
[[Category: Muscle]]
[[Category: Oxygen transport]]
[[Category: Respiratory protein]]

Latest revision as of 11:49, 14 February 2024

MYOGLOBIN (HORSE HEART) MUTANT WITH LEU 104 REPLACED BY ASN (L104N)MYOGLOBIN (HORSE HEART) MUTANT WITH LEU 104 REPLACED BY ASN (L104N)

Structural highlights

1xch is a 1 chain structure with sequence from Equus caballus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.7Å
Ligands:,
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

MYG_HORSE 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

1xch, resolution 1.70Å

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Proteopedia Page Contributors and Editors (what is this?)Proteopedia Page Contributors and Editors (what is this?)

OCA
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