Raman detection of a peroxy intermediate in the hydroquinone-oxidizing cytochrome aa3 of Bacillus subtilis.
Raman detection of a peroxy intermediate in the hydroquinone-oxidizing cytochrome aa3 of Bacillus subtilis.
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枯草芽孢杆菌氢醌氧化细胞色素 aa3 中过氧中间体的拉曼检测。
DOI:
10.1016/0005-2728(95)00076-u
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发表时间:
1995
期刊:
影响因子:
--
通讯作者:
Wikström,M
中科院分区:
文献类型:
--
作者:
Varotsis,C;Babcock,GT;Lauraeus,M;Wikström,M
When the mixed valence, carbon monoxide-bound form of the hydroquinone-oxidizing cytochrome aa3−600 of Bacillus subtilis is illuminated in the presence of O2, it forms a species that corresponds to ‘Compound C’, first described for the mitochondria) cytochrome c oxidase by Chance, Saronio and Leigh (J. Biol. Chem. 250 (1975) 9226–9237). Resonance Raman spectra of the this species show a mode at 366 cm−1that shifts to 342 cm−1when the experiment is repeated with18O2. The appearance of this mode is insensitive to deuteration exchange within the limits of resolution. High- (1200–1700 cm−1) and low-frequency (200–500 cm−1) data, allow us to assign the 366 cm−1mode to the Fe3+-O stretching vibration of a peroxide adduct where the iron is either low or intermediate spin. This is to our knowledge the first time an18O2-sensitive iron-oxygen stretching mode has been reported for ‘Compound C’, providing strong support for the notion that this species is a peroxide adduct. The observed 366 cm−1ν(Fe3+-O−-O−) frequency is 8 cm−1higher than that previously found for a transient peroxy intermediate in the reaction between the fully reduced mitochondria) enzyme and 02. Our observation indicates that, while similar, the metastable peroxyheme a3 species reported here differs in the fine details of geometry, protonation state, and/or hydrogen bond status.
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影响因子:
2.9
作者:
Larsen,RW;Li,W;Copeland,RA;Witt,SN;Lou,BS;Chan,SI;Ondrias,MR
通讯作者:
Ondrias,MR
DOI:
--
发表时间:
1989
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Han,SW;Ching,YC;Rousseau,DL
通讯作者:
Rousseau,DL
影响因子:
2.9
作者:
M. Lauraeus;Mårten Wikström;C. Varotsis;M. Tecklenburg;Gerald T. Babcock
通讯作者:
M. Lauraeus;Mårten Wikström;C. Varotsis;M. Tecklenburg;Gerald T. Babcock
影响因子:
15
作者:
Sanghwa Han;Y. Ching;D. Rousseau
通讯作者:
D. Rousseau
影响因子:
2.9
作者:
Varotsis,C;Babcock,GT
通讯作者:
Babcock,GT