MODE-SELECTIVE ENERGY LOCALIZATION DURING PHOTOEXCITATION OF DEOXYHEMOGLOBIN AND HEME MODEL COMPLEXES

被引：27

作者：

SCHNEEBECK, MC ^{[1
]}

VIGIL, LE ^{[1
]}

ONDRIAS, MR ^{[1
]}

机构：

[1] UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131

来源：

CHEMICAL PHYSICS LETTERS | 1993年 / 215卷 / 1-3期

关键词：

D O I：

10.1016/0009-2614(93)89296-T

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：

Vibrational energy redistribution may be important in regulating the function of hemes and related macrocycles. Transient resonance Raman experiments reveal a non-Boltzmann vibrational energy distribution among the heme normal modes of photoexcited deoxyhemoglobin. Within 10 ns excitation pulses, v4 exhibits flux-dependent anti-Stokes peak position, Stokes and anti-Stokes linewidths, and anti-Stokes:Stokes ratios corresponding to temperatures as high as 600 K. Other modes, most notably v7, do not behave in this manner. Spectra of protoporphyrin IX-2-methyl-imidazole obtained under the same conditions indicate that specific heme-protein interactions cannot be entirely responsible for this behavior.

引用

页码：251 / 256

页数：6

共 37 条

[21]

KHUNDKAR LR, 1990, ANNU REV PHYS CHEM, V41, P15

[22]

KHUNDKAR LR, 1990, ANNU REV PHYS CHEM, V41, P41

[23] PROBING PICOSECOND PROCESSES WITH NANOSECOND LASERS - ELECTRONIC AND VIBRATIONAL-RELAXATION DYNAMICS OF HEME-PROTEINS [J].