Correlation of paramagnetic states and molecular structure in bacterial photosynthetic reaction centers: the symmetry of the primary electron donor in Rhodopseudomonas viridis and Rhodobacter sphaeroides R-26.
Correlation of paramagnetic states and molecular structure in bacterial photosynthetic reaction centers: the symmetry of the primary electron donor in Rhodopseudomonas viridis and Rhodobacter sphaeroides R-26.
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细菌光合反应中心顺磁态与分子结构的相关性：绿色红假单胞菌和球形红细菌R-26中初级电子供体的对称性。
DOI：
10.1073/pnas.86.12.4335
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发表时间：
1989
影响因子：
11.1
通讯作者：
Schiffer,M
中科院分区：
文献类型：
--
作者：
Norris,JR;Budil,DE;Gast,P;Chang,CH;el-Kabbani,O;Schiffer,M
在光合反应中心的单晶中测量的初级电子供体三重态的主轴的取向相比，细菌Rhodobacter（Rb）的X射线结构。sphaeroides R-26和红球藻Rhodoptera（Rps.）绿色的Rps的主要供体。viridis与Rb有显著差异。sphaeroides测量的轴的方向表明，三重激发几乎完全本地化的L-亚基一半的二聚体在Rps。viridis，但在Rb的二聚体供体上分布更对称（约63%在特殊对的L半上，约37%在M半上）。sphaeroides R-26。零场分裂参数相对于单体细菌叶绿素三重态在体外的大幅度降低表明两种生物体的特殊对三重态中不对称电荷转移电子构型的显著参与（在Rps中约为23%）。viridis和Rb中约13%。sphaeroides）。
The orientation of the principal axes of the primary electron donor triplet state measured in single crystals of photosynthetic reaction centers is compared to the x-ray structures of the bacteria Rhodobacter (Rb.) sphaeroides R-26 and Rhodopseudomonas (Rps.) viridis. The primary donor of Rps. viridis is significantly different from that of Rb. sphaeroides. The measured directions of the axes indicate that triplet excitation is almost completely localized on the L-subunit half of the dimer in Rps. viridis but is more symmetrically distributed (approximately 63% on the L half of the special pair and approximately 37% on the M half) on the dimeric donor in Rb. sphaeroides R-26. The large reduction of the zero field splitting parameters relative to monomeric bacteriochlorophyll triplet in vitro suggests significant participation of asymmetrical charge transfer electronic configurations in the special pair triplet state of both organisms (approximately 23% in Rps. viridis and approximately 13% in Rb. sphaeroides).