Time-resolved Raman evidence for energy 'funneling' through propionate side chains in heme 'cooling' upon photolysis of carbonmonoxy myoglobin

被引：32

作者：

Gao, Ying

Koyama, Mai

El-Mashtoly, Samir F.

Hayashi, Takashi

Harada, Katsuyoshi

Mizutani, Yasuhisa

Kitagawa, Teizo

机构：

[1] Grad Univ Adv Studies, Sch Adv Sci, Kanagawa 2400193, Japan

[2] Natl Inst Nat Sci, Okazaki Inst Integrat Biosci, Okazaki, Aichi 4448787, Japan

[3] Kobe Univ, Dept Chem, Grad Sch Sci & Technol, Kobe, Hyogo 6578501, Japan

[4] Osaka Univ, Grad Sch Engn, Suita, Osaka 5650871, Japan

[5] Kobe Univ, Mol Photosci Res Ctr, Kobe, Hyogo 6578501, Japan

来源：

CHEMICAL PHYSICS LETTERS | 2006年 / 429卷 / 1-3期

基金：

日本学术振兴会;

关键词：

D O I：

10.1016/j.cplett.2006.07.085

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：

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.

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收藏

页码：239 / 243

页数：5

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