Dynamics of myoglobin-CO with the proximal histidine removed: Vibrational echo experiments
被引:32
作者:
Rector, KD
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机构:Stanford Univ, Dept Chem, Stanford, CA 94305 USA
Rector, KD
Engholm, JR
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机构:Stanford Univ, Dept Chem, Stanford, CA 94305 USA
Engholm, JR
Hill, JR
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机构:Stanford Univ, Dept Chem, Stanford, CA 94305 USA
Hill, JR
Myers, DJ
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机构:Stanford Univ, Dept Chem, Stanford, CA 94305 USA
Myers, DJ
Hu, R
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机构:Stanford Univ, Dept Chem, Stanford, CA 94305 USA
Hu, R
Boxer, SG
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机构:Stanford Univ, Dept Chem, Stanford, CA 94305 USA
Boxer, SG
Dlott, DD
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机构:Stanford Univ, Dept Chem, Stanford, CA 94305 USA
Dlott, DD
Fayer, MD
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机构:
Stanford Univ, Dept Chem, Stanford, CA 94305 USAStanford Univ, Dept Chem, Stanford, CA 94305 USA
Fayer, MD
[1
]
机构:
[1] Stanford Univ, Dept Chem, Stanford, CA 94305 USA
[2] Stanford Univ, Stanford Free Electron Laser Ctr, Stanford, CA 94305 USA
[3] Univ Illinois, Sch Chem Sci, Urbana, IL 61801 USA
来源:
JOURNAL OF PHYSICAL CHEMISTRY B
|
1998年
/
102卷
/
02期
关键词:
D O I:
10.1021/jp9730048
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
Picosecond infrared vibrational echo measurements from 60 to 300 K on CO bound to the active site of a mutant myoglobin, H93G(N-MeIm), are presented and compared to measurements on native myoglobin and on the mutant H64V. Although in H93G(N-MeIm) (the proximal histidine replaced by glycine, with exogenous N-methylimidazole in the proximal histidine pocket, covalently bound to Fe), the only covalent linkage between heme-CO and the protein is broken, there is no change in the temperature-dependent vibrational pure dephasing time, T-2*. The results demonstrate that severing the only covalent bond between the heme and the globin has little or no effect on the protein dynamics detected by vibration of the CO at the active site of myoglobin.