Soret Band of the Gas-Phase Ferri-Cytochrome c.

Soret Band of the Gas-Phase Ferri-Cytochrome c.
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气相铁细胞色素的 Soret 带 c.

DOI:
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发表时间:
2012
影响因子:
5.7
通讯作者:
P. Dugourd
P. Dugourd
中科院分区:
化学2区
文献类型:
--
作者:
C. Brunet;R. Antoine;J. Lemoine;P. Dugourd

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我们报告的第一个可见光谱的血红素蛋白在气相中。本工作的目的是提供一个参考的光吸收的一个分离的血红素蛋白质,以更好地了解蛋白质的构象和波动,以及溶剂对其光学性质的影响。激光照射气相细胞色素c后,观察到电子发射。电子光剥离产率的细胞色素c 6-被记录在该地区的Soret带的卟啉基团,在410 nm处显示出最大值。我们的结果进行了比较,气相血红素和溶液中的细胞色素c的光谱。我们讨论了多肽链和溶剂对Soret带的位置和加宽的影响。气相细胞色素c的吸收光谱与天然细胞色素c在溶液中的吸收光谱相近,表明多肽链能有效地保护血红素基团不受溶剂的影响,并且溶液和气相中两个基团之间的相互作用相似。
We report the first visible spectrum of a heme-protein in the gas phase. The aim of this work was to provide a reference for the optical absorption of an isolated heme-protein to better understand the influence of protein conformation and fluctuation and of solvent on its optical properties. After laser irradiation of gas-phase cytochrome c (cyt c), electron emission is observed. Electron photodetachment yield of cyt c 6- was recorded in the region of the Soret band of the porphyrin group, showing a maximum at 410 nm. Our results are compared with optical spectra of gas-phase heme and of cyt c in solution. We discuss the influence of the polypeptide chain and of the solvent on both the position and the broadening of the Soret band. Action spectrum of gas-phase cyt c is close to the absorption of native cyt c in solution, suggesting an efficient protection of the heme group from solvent accessibility by the polypeptide chain and similar interactions between the two moieties in solution and the gas phase.
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