Resonance Raman studies of dioxygen adducts of cobalt-substituted heme proteins and model compounds. Vibrationally coupled dioxygen and the issues of multiple structures and distal side hydrogen bonding
作者:Alan. Bruha、James R. Kincaid
DOI:10.1021/ja00226a014
日期:1988.8
dioxygen is hydrogen bonded to the distal histidylimidazole in these protein systems. However, the present interpretation argues that the frequency shifts of u ( ~ ~ O ' ~ O ) observed upon replacement of H20 by D20 cannot be taken as evidence for this distal side hydrogen bonding. Finally, it is suggested that the spectroscopic consequences of such coupling not only complicate the interpretation of oxygen
钴取代血红素蛋白的氧加合物的共振拉曼 (RR) 光谱已在氧-氧拉伸区域进行了仔细研究。研究中包括肌红蛋白 (Mb,)、血红蛋白 (Hbco) 的钴类似物及其分离的亚基 (ace 和 pc0) 以及铁/钴混合血红蛋白杂化物,l 6 0 , , IsO2 的光谱, 和扰氧 (1602:160-'80:'802, 1:2:1) 加合物在正常 (H2O) 和氘化 (D20) 缓冲液中对每种蛋白质进行了测量。H 2 0 溶液中位于 -1 135、-1098 和 -1065 cm-' 处的强带用 v ( '~O'~O) 、~ ( ' ~ 0 ' ~ 0 ) 和 V ( ~ ~ O ' ~ O ) ,分别。这些带在 D20 溶液中的位移和特定同位素氧加合物光谱中较弱特征的选择性出现被解释为 v ( 0 0 ) 与近端和/或远端组氨咪唑的内部模式振动耦合的结果。这种解释的合理性得到了在模型复合系统中观察到