小球藻光合反应中质体醌的研究
A Study of Plastoquinones in Photochemical Reactions in the Chloroplasts of Euglena gracilis Strain Z.
机构信息
Department of Chemistry, Western Washington State College, Bellingham, Washington 98225.
出版信息
Plant Physiol. 1968 Oct;43(10):1661-5. doi: 10.1104/pp.43.10.1661.
Plastoquinone-9 (PQ-9) was isolated from the chloroplasts of Euglena gracilis Strain Z and spinach. The functional involvement and the structural specificity of PQ-9 in photochemical reactions was investigated in the isolated chloroplasts of Euglena gracilis. It was found that PQ-9 was required for both photoreduction of ferricyanide and photosynthetic phosphorylation in Euglena chloroplasts. The structural integrity of PQ-9 was not required to the same degree in the 2 photochemical reactions. Photosynthetic phosphorylation seemed to require the entire molecular structure of PQ-9 for the activity, whereas shortening in isoprenoid chain and modification of quinoid nucleus of PQ-9 do not seem to alter the photoreduction activity significantly. Addition of PQ-9 to the lyophilized Euglena chloroplasts inhibited the photoreduction of ferricyanide significantly, while it stimulated photosynthetic phosphorylation activity.
质体醌-9（PQ-9）从眼虫和菠菜的叶绿体中分离出来。在分离的眼虫叶绿体中研究了 PQ-9 在光化学反应中的功能参与和结构特异性。结果发现，PQ-9 是眼虫叶绿体中铁氰化物光还原和光合磷酸化所必需的。在这两种光化学反应中，PQ-9 的结构完整性不需要达到相同的程度。光合磷酸化似乎需要 PQ-9 的整个分子结构才能发挥活性，而 PQ-9 的异戊二烯链缩短和醌核修饰似乎不会显著改变光还原活性。向冻干的眼虫叶绿体中添加 PQ-9 可显著抑制铁氰化物的光还原，同时刺激光合磷酸化活性。
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