1cpw: Difference between revisions
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==RECOMBINANT SPERM WHALE MYOGLOBIN L104W MUTANT (MET)== | ==RECOMBINANT SPERM WHALE MYOGLOBIN L104W MUTANT (MET)== | ||
<StructureSection load='1cpw' size='340' side='right' caption='[[1cpw]], [[Resolution|resolution]] 2.20Å' scene=''> | <StructureSection load='1cpw' size='340' side='right' caption='[[1cpw]], [[Resolution|resolution]] 2.20Å' scene=''> | ||
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<table><tr><td colspan='2'>[[1cpw]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Phycd Phycd]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CPW OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1CPW FirstGlance]. <br> | <table><tr><td colspan='2'>[[1cpw]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Phycd Phycd]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CPW OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1CPW FirstGlance]. <br> | ||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><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'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1cpw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cpw OCA], [http://pdbe.org/1cpw PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1cpw RCSB], [http://www.ebi.ac.uk/pdbsum/1cpw PDBsum]</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=1cpw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cpw OCA], [http://pdbe.org/1cpw PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1cpw RCSB], [http://www.ebi.ac.uk/pdbsum/1cpw PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1cpw ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Function == | == Function == | ||
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Check<jmol> | Check<jmol> | ||
<jmolCheckbox> | <jmolCheckbox> | ||
<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/cp/1cpw_consurf.spt"</scriptWhenChecked> | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/cp/1cpw_consurf.spt"</scriptWhenChecked> | ||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | ||
<text>to colour the structure by Evolutionary Conservation</text> | <text>to colour the structure by Evolutionary Conservation</text> | ||
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</div> | </div> | ||
<div class="pdbe-citations 1cpw" style="background-color:#fffaf0;"></div> | <div class="pdbe-citations 1cpw" style="background-color:#fffaf0;"></div> | ||
== References == | == References == | ||
<references/> | <references/> | ||
Revision as of 11:20, 6 December 2017
RECOMBINANT SPERM WHALE MYOGLOBIN L104W MUTANT (MET)RECOMBINANT SPERM WHALE MYOGLOBIN L104W MUTANT (MET)
Structural highlights
Function[MYG_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 PubMedThe ability of myoglobin to bind oxygen reversibly depends critically on retention of the heme prosthetic group. Globin side chains at the Leu(89)(F4), His(97)(FG3), Ile(99)(FG5), and Leu(104)(G5) positions on the proximal side of the heme pocket strongly influence heme affinity. The roles of these amino acids in preventing heme loss have been examined by determining high resolution structures of 14 different mutants at these positions using x-ray crystallography. Leu(89) and His(97) are important surface amino acids that interact either sterically or electrostatically with the edges of the porphyrin ring. Ile(99) and Leu(104) are located in the interior region of the proximal pocket beneath ring C of the heme prosthetic group. The apolar amino acids Leu(89), Ile(99), and Leu(104) "waterproof" the heme pocket by forming a barrier to solvent penetration, minimizing the size of the proximal cavity, and maintaining a hydrophobic environment. Substitutions with smaller or polar side chains at these positions result in exposure of the heme to solvent, the appearance of crystallographically defined water molecules in or near the proximal pocket, and large increases in the rate of hemin loss. Thus, the naturally occurring amino acid side chains at these positions serve to prevent hydration of the His(93)-Fe(III) bond and are highly conserved in all known myoglobins and hemoglobins. Waterproofing the heme pocket. Role of proximal amino acid side chains in preventing hemin loss from myoglobin.,Liong EC, Dou Y, Scott EE, Olson JS, Phillips GN Jr J Biol Chem. 2001 Mar 23;276(12):9093-100. Epub 2000 Nov 17. PMID:11084036[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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