Time-resolved Raman evidence for energy 'funneling' through propionate side chains in heme 'cooling' upon photolysis of carbonmonoxy myoglobin
Time-resolved Raman evidence for energy 'funneling' through propionate side chains in heme 'cooling' upon photolysis of carbonmonoxy myoglobin
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DOI：
10.1016/j.cplett.2006.07.085
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发表时间：
2006-09-29
影响因子：
2.8
通讯作者：
Kitagawa, Teizo
中科院分区：
文献类型：
--
作者：
Gao, Ying;Koyama, Mai;Kitagawa, Teizo
用皮秒时间分辨反斯托克斯拉曼光谱研究了血红素在CO光解后的“冷却”过程。两种修饰Mb的振动激发态的布居衰减时间常数明显大于天然Mb。这是第一个实验证据，每个血红素丙酸侧链的振动能量转移从血红素到周围环境的可观的贡献。(c)2006 Elsevier B.V.保留所有权利。
The heme 'cooling' following CO photolysis was investigated with picosecond time-resolved anti-Stokes Raman spectroscopy on modified myoglobins (Mb), in which the 6- or 7-propionate is selectively replaced by a methyl group. The time constants of population decay of vibrationally excited states for two modified Mbs became significantly larger compared with those of native Mb. This is the first experimental evidence for appreciable contribution of each heme-propionate side chain to the vibrational energy transfer from the heme to the surroundings. (c) 2006 Elsevier B.V. All rights reserved.