1mcy: Difference between revisions

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[[Image:1mcy.jpg|left|200px]]<br /><applet load="1mcy" size="~~450~~" color="white" frame="true" align="right" spinBox="true"

[[Image:1mcy.jpg|left|200px]]<br /><applet load="1mcy" size="350" color="white" frame="true" align="right" spinBox="true"

caption="1mcy, resolution 1.7Å" />

'''SPERM WHALE MYOGLOBIN (MUTANT WITH INITIATOR MET AND WITH HIS 64 REPLACED BY GLN, LEU 29 REPLACED BY PHE'''<br />

==Overview==

The functional, spectral, and structural properties of elephant myoglobin, and the L29F/H64Q mutant of sperm whale myoglobin have been compared in, detail by conventional kinetic techniques, infrared and resonance Raman, spectroscopy, 1H NMR, and x-ray crystallography. There is a striking, correspondence between the properties of the naturally occurring elephant, protein and those of the sperm whale double mutant, both of which are, quite distinct from those of native sperm whale myoglobin and the single, H64Q mutant. These results and the recent crystal structure determination, by Bisig et al. (Bisig, D. A., Di Iorio, E. E., Diederichs, K., Winterhalter, K. H., and Piontek, K. (1995) J. Biol. Chem. 270, 20754-20762) confirm that a Phe residue is present at position 29 (B10) in, elephant myoglobin, and not a Leu residue as is reported in the published, amino acid sequence. The single Gln64(E7) substitution lowers oxygen, affinity approximately 5-fold and increases the rate of autooxidation, 3-fold. These unfavorable effects are reversed by the Phe29(B10), replacement in both elephant myoglobin and the sperm whale double mutant., The latter, genetically engineered protein was originally constructed to, be a blood substitute prototype with moderately low O2 affinity, large, rate constants, and increased resistance to autooxidation. Thus, the same, distal pocket combination that we designed rationally on the basis of, proposed mechanisms for ligand binding and autooxidation is also found in, nature.

The functional, spectral, and structural properties of elephant myoglobin and the L29F/H64Q mutant of sperm whale myoglobin have been compared in detail by conventional kinetic techniques, infrared and resonance Raman spectroscopy, 1H NMR, and x-ray crystallography. There is a striking correspondence between the properties of the naturally occurring elephant protein and those of the sperm whale double mutant, both of which are quite distinct from those of native sperm whale myoglobin and the single H64Q mutant. These results and the recent crystal structure determination by Bisig et al. (Bisig, D. A., Di Iorio, E. E., Diederichs, K., Winterhalter, K. H., and Piontek, K. (1995) J. Biol. Chem. 270, 20754-20762) confirm that a Phe residue is present at position 29 (B10) in elephant myoglobin, and not a Leu residue as is reported in the published amino acid sequence. The single Gln64(E7) substitution lowers oxygen affinity approximately 5-fold and increases the rate of autooxidation 3-fold. These unfavorable effects are reversed by the Phe29(B10) replacement in both elephant myoglobin and the sperm whale double mutant. The latter, genetically engineered protein was originally constructed to be a blood substitute prototype with moderately low O2 affinity, large rate constants, and increased resistance to autooxidation. Thus, the same distal pocket combination that we designed rationally on the basis of proposed mechanisms for ligand binding and autooxidation is also found in nature.

==About this Structure==

1MCY is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Physeter_catodon Physeter catodon] with SO4, HEM and CMO as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://~~ispc~~.weizmann.ac.il/oca-bin/ocashort?id=1MCY OCA].

1MCY is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Physeter_catodon Physeter catodon] with <scene name='pdbligand=SO4:'>SO4</scene>, <scene name='pdbligand=HEM:'>HEM</scene> and <scene name='pdbligand=CMO:'>CMO</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MCY OCA].

==Reference==

Line 13:

[[Category: Physeter catodon]]

[[Category: Single protein]]

[[Category: Jr., G.N.Phillips.]]

[[Category: Jr., G N.Phillips.]]

[[Category: Li, T.]]

[[Category: CMO]]

Line 22:

[[Category: respiratory protein]]

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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:54:00 2008''

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@@ Line 1: / Line 1: @@
-[[Image:1mcy.jpg|left|200px]]<br /><applet load="1mcy" size="450" color="white" frame="true" align="right" spinBox="true"
+[[Image:1mcy.jpg|left|200px]]<br /><applet load="1mcy" size="350" color="white" frame="true" align="right" spinBox="true"
 caption="1mcy, resolution 1.7&Aring;" />
 '''SPERM WHALE MYOGLOBIN (MUTANT WITH INITIATOR MET AND WITH HIS 64 REPLACED BY GLN, LEU 29 REPLACED BY PHE'''<br />
 ==Overview==
-The functional, spectral, and structural properties of elephant myoglobin, and the L29F/H64Q mutant of sperm whale myoglobin have been compared in, detail by conventional kinetic techniques, infrared and resonance Raman, spectroscopy, 1H NMR, and x-ray crystallography. There is a striking, correspondence between the properties of the naturally occurring elephant, protein and those of the sperm whale double mutant, both of which are, quite distinct from those of native sperm whale myoglobin and the single, H64Q mutant. These results and the recent crystal structure determination, by Bisig et al. (Bisig, D. A., Di Iorio, E. E., Diederichs, K., Winterhalter, K. H., and Piontek, K. (1995) J. Biol. Chem. 270, 20754-20762) confirm that a Phe residue is present at position 29 (B10) in, elephant myoglobin, and not a Leu residue as is reported in the published, amino acid sequence. The single Gln64(E7) substitution lowers oxygen, affinity approximately 5-fold and increases the rate of autooxidation, 3-fold. These unfavorable effects are reversed by the Phe29(B10), replacement in both elephant myoglobin and the sperm whale double mutant., The latter, genetically engineered protein was originally constructed to, be a blood substitute prototype with moderately low O2 affinity, large, rate constants, and increased resistance to autooxidation. Thus, the same, distal pocket combination that we designed rationally on the basis of, proposed mechanisms for ligand binding and autooxidation is also found in, nature.
+The functional, spectral, and structural properties of elephant myoglobin and the L29F/H64Q mutant of sperm whale myoglobin have been compared in detail by conventional kinetic techniques, infrared and resonance Raman spectroscopy, 1H NMR, and x-ray crystallography. There is a striking correspondence between the properties of the naturally occurring elephant protein and those of the sperm whale double mutant, both of which are quite distinct from those of native sperm whale myoglobin and the single H64Q mutant. These results and the recent crystal structure determination by Bisig et al. (Bisig, D. A., Di Iorio, E. E., Diederichs, K., Winterhalter, K. H., and Piontek, K. (1995) J. Biol. Chem. 270, 20754-20762) confirm that a Phe residue is present at position 29 (B10) in elephant myoglobin, and not a Leu residue as is reported in the published amino acid sequence. The single Gln64(E7) substitution lowers oxygen affinity approximately 5-fold and increases the rate of autooxidation 3-fold. These unfavorable effects are reversed by the Phe29(B10) replacement in both elephant myoglobin and the sperm whale double mutant. The latter, genetically engineered protein was originally constructed to be a blood substitute prototype with moderately low O2 affinity, large rate constants, and increased resistance to autooxidation. Thus, the same distal pocket combination that we designed rationally on the basis of proposed mechanisms for ligand binding and autooxidation is also found in nature.
 ==About this Structure==
-MCY is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Physeter_catodon Physeter catodon] with SO4, HEM and CMO as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1MCY OCA].
+MCY is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Physeter_catodon Physeter catodon] with <scene name='pdbligand=SO4:'>SO4</scene>, <scene name='pdbligand=HEM:'>HEM</scene> and <scene name='pdbligand=CMO:'>CMO</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MCY OCA].
 ==Reference==
@@ Line 13: / Line 13: @@
 [[Category: Physeter catodon]]
 [[Category: Single protein]]
-[[Category: Jr., G.N.Phillips.]]
+[[Category: Jr., G N.Phillips.]]
 [[Category: Li, T.]]
 [[Category: CMO]]
@@ Line 22: / Line 22: @@
 [[Category: respiratory protein]]
-''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 21:20:09 2007''
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:54:00 2008''