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1yca

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Revision as of 06:45, 25 April 2018

DISTAL POCKET POLARITY IN LIGAND BINDING TO MYOGLOBIN: DEOXY AND CARBONMONOXY FORMS OF A THREONINE68 (E11) MUTANT INVESTIGATED BY X-RAY CRYSTALLOGRAPHY AND INFRARED SPECTROSCOPY

Structural highlights

1yca is a 2 chain structure with sequence from Pig. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
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.

Publication Abstract from PubMed

The crystal structures of the deoxy and carbonmonoxy forms of a distal pocket myoglobin mutant in which valine68(E11) is replaced by threonine have been solved to 2.1- and 2.2-A resolution, respectively. This substitution has been shown previously to cause large decreases in the rate of oxygen binding and to lower the equilibrium association constants for O2 and CO. The synchrotron Laue method was used for the rapid acquisition of X-ray diffraction data to overcome problems caused by the very rapid rate of autooxidation of the mutant protein. The refined deoxy structure shows that the noncoordinated water molecule in the distal pocket is in a position to form strong hydrogen bonds with both the N epsilon-H of the distal histidine64 and O gamma of threonine68 with no other unexpected alterations in the protein structure. In the carbonmonoxy form, the bound ligand is well-defined and inclined away from the two hydrogen-bonding groups, refining to a position in which the Fe-C-O angle is 162 degrees. This value is very close to that previously observed in recombinant wild-type and position-64 (E7) mutants of sperm whale myoglobin (160-170 degrees). The similarity of the CO conformations contrasts with the 150-fold range in equilibrium binding constants (KCO) among the distal pocket myoglobin mutants and indicates that CO affinities cannot be predicted from the coordination geometry of the bound ligand. Furthermore, a comparison of the infrared stretching frequencies of CO in wild-type, valine64 and threonine68 single mutant, and valine64-threonine68 double mutant pig carbonmonoxymyoglobins shows a lack of correlation between KCO and vCO. These effects can be understood in terms of the stability of noncovalently bound water in deoxymyoglobin and electrostatic interactions between bound ligands and the distal pocket residues.

Distal pocket polarity in ligand binding to myoglobin: deoxy and carbonmonoxy forms of a threonine68(E11) mutant investigated by X-ray crystallography and infrared spectroscopy.,Cameron AD, Smerdon SJ, Wilkinson AJ, Habash J, Helliwell JR, Li T, Olson JS Biochemistry. 1993 Dec 7;32(48):13061-70. PMID:8241160^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Cameron AD, Smerdon SJ, Wilkinson AJ, Habash J, Helliwell JR, Li T, Olson JS. Distal pocket polarity in ligand binding to myoglobin: deoxy and carbonmonoxy forms of a threonine68(E11) mutant investigated by X-ray crystallography and infrared spectroscopy. Biochemistry. 1993 Dec 7;32(48):13061-70. PMID:8241160

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1yca"

@@ Line 1: / Line 1: @@
 ==DISTAL POCKET POLARITY IN LIGAND BINDING TO MYOGLOBIN: DEOXY AND CARBONMONOXY FORMS OF A THREONINE68 (E11) MUTANT INVESTIGATED BY X-RAY CRYSTALLOGRAPHY AND INFRARED SPECTROSCOPY==
 <StructureSection load='1yca' size='340' side='right' caption='[[1yca]], [[Resolution|resolution]] 2.90&Aring;' scene=''>
@@ Line 4: / Line 5: @@
 <table><tr><td colspan='2'>[[1yca]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Pig Pig]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1YCA OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1YCA FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CMO:CARBON+MONOXIDE'>CMO</scene>, <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'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1yca FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1yca OCA], [http://pdbe.org/1yca PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1yca RCSB], [http://www.ebi.ac.uk/pdbsum/1yca 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=1yca FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1yca OCA], [http://pdbe.org/1yca PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1yca RCSB], [http://www.ebi.ac.uk/pdbsum/1yca PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1yca ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 12: / Line 13: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/yc/1yca_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/yc/1yca_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>

1yca

From Proteopedia

Revision as of 06:45, 25 April 2018

DISTAL POCKET POLARITY IN LIGAND BINDING TO MYOGLOBIN: DEOXY AND CARBONMONOXY FORMS OF A THREONINE68 (E11) MUTANT INVESTIGATED BY X-RAY CRYSTALLOGRAPHY AND INFRARED SPECTROSCOPY

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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