Volume contraction on photoexcitation of the reaction center from Rhodobacter sphaeroides R-26: internal probe of dielectrics.
Volume contraction on photoexcitation of the reaction center from Rhodobacter sphaeroides R-26: internal probe of dielectrics.
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球形红细菌 R-26 反应中心光激发时的体积收缩：电介质的内部探针。
DOI：
10.1016/s0006-3495(95)80185-2
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发表时间：
1995
影响因子：
3.4
通讯作者：
Zhang,JW
中科院分区：
文献类型：
--
作者：
Mauzerall,DC;Gunner,MR;Zhang,JW
反应中心的Rhodobacter sphaeroides经过大约20 A3 /摩尔体积收缩在< 50激发后ns。体积的迅速变化暂时归因于电致伸缩。从其大小可以推断，如果反应中心的可压缩性与球状蛋白相似，则有效介电系数为10-15。体积收缩对其他醌取代QA位点的天然泛醌或占用QB位点不敏感。压力对反应中心造成的猝灭很可能发生在比电子转移更快的时间尺度上。
Reaction centers of Rhodobacter sphaeroides undergo a approximately 20 A3/mole volume contraction in < 50 ns after excitation. The rapid volume change is tentatively assigned to electrostriction. From its magnitude, we infer that the effective dielectric coefficient is 10–15 if the compressibility of the reaction center is similar to that of globular proteins. The volume contraction is not sensitive to replacement of the natural ubiquinone at the QA site by other quinones or to the occupancy of the QB site. The quenching caused by pressure on the reaction centers most likely occurs on a faster time scale than that of electron transfer.