Hydrogen bonding of sulfur ligands in blue copper and iron-sulfur proteins: detection by resonance Raman spectroscopy.
Hydrogen bonding of sulfur ligands in blue copper and iron-sulfur proteins: detection by resonance Raman spectroscopy.
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蓝铜和铁硫蛋白中硫配体的氢键:通过共振拉曼光谱检测。
DOI:
10.1021/bi00399a006
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发表时间:
1987
期刊:
影响因子:
2.9
通讯作者:
Sanders-Loehr,J
中科院分区:
文献类型:
--
作者:
Mino,Y;Loehr,TM;Wada,K;Matsubara,H;Sanders-Loehr,J
Department of Chemical and Biological Sciences, Oregon Graduate Center, Beaverton, Oregon 97006-1999, and Department of Biology, Faculty of Science, OsakaUniversity, Toyonaka, Osaka 560, Japan Received May 14, 1987; Revised Manuscript Received July 30, 1987 abstract: The resonance Raman spectrum of the blue copper protein azurin from Alcaligenes denitrificans exhibits nine vibrational modes between 330 and 460 cm-1, seven of which shift 0.4-3.0 cm-1 to lower energy after incubation of the protein in D20. These deuterium-dependent shifts have been previously ascribed to exchangeable protons on imidazole ligands [Nestor, L, Larrabee, J. A., Woolery, G., Reinhammar, B., & Spiro, TG (1984) Biochemistry 23, 1084] or to exchangeable protons on amide groups which are hydrogen bonded to the cysteine thiolate ligands (a feature common to all bluecopper proteins of known structure). In order to distinguish between these two possibilities, a systematic investigation of Fe2S2 (Cys) 4-containing proteins was undertaken. Extensive hydrogen bonding between sulfur ligands and the polypeptide backbone had been observed in the crystal structure of ferredoxin from Spirulina platensis. The resonance Raman spectrum of this protein is typical of a chloroplast-type ferredoxin and exhibits deuterium-dependent shifts of-0.3 to-0.5 cm'1 in theFe-S modes at 283, 367, and 394 cm" 1 (assigned to the bridging sulfurs) and-0.6 to-0.8 cm" 1 in the Fe-S modes at 328 and 341 cm" 1 (assigned to the terminal cysteine thiolates).Considerably greater deuterium sensitivity is observed in the Raman spectra of spinach ferredoxin and bovine adrenodoxin, particularly for the symmetric stretchingvibration of the Fe2S2 moiety at~ 390 cm" 1. This feature decreases by 0.8 and 1.1 cm" 1, respectively, for the two oxidized proteins inD20 and by 1.8 cm" 1 for reduced adrenodoxin inD20. These results suggest that the bridging sulfido groups may be more extensively hydrogen bonded in spinach ferredoxin and adrenodoxin than in S. platensis ferredoxin, with a further increase in hydrogen-bond strength in the reduced form of adrenodoxin. The similarity of the deuterium effects in the iron-sulfur and blue copper
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影响因子:
15
作者:
J. Larrabee;T. Spiro
通讯作者:
T. Spiro
影响因子:
2.9
作者:
L. Nestor;J. Larrabee;G. Woolery;B. Reinhammar;T. Spiro
通讯作者:
T. Spiro
DOI:
--
发表时间:
1986
期刊:
影响因子:
--
作者:
W. Maret;A. K. Shiemke;W. D. Wheeler;T. Loehr;J. Sanders
通讯作者:
J. Sanders
DOI:
10.1016/s0021-9258(18)34807-5
发表时间:
1982
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
R. Magliozzo;B. McIntosh;W. Sweeney
通讯作者:
W. Sweeney
影响因子:
2.9
作者:
T. Loehr;W. Keyes;P. Pincus
通讯作者:
P. Pincus