检索结果-南通市图书馆

THE FUNCTIONAL ROLE OF 23 kD AND 24 kD POLYPEPTIDES OF THYLAKOID IN Mg^(2+)-INDUCED CHANGE OF EXCITATION ENERGY DISTRIBUTION BETWEEN TWO PHOTOSYSTEMS IN THE CHLOROPLASTS FROM Codium fragile

引用

Science China Chemistry 1992年第12期35卷 1453-1462页

作者：李良壁高振泮马红赵鸿儒翟小京马桂芝 Institute of Botany Academia Sinica Beijing 100044 PRC Institute of Oceanology Academia Sinica Qingdao 266071 PRC Institute of Botany Academia Sinica Beijing 100044 PRC In contrast to the chloroplasts from higher plants Mg~(2+)-induced PS--Ⅱfluorescence inten-sity increase does not relate to Mg~(2+)-induced surface charge density decrease of thylakoidin the chloroplasts from Codium fragile. Tbe extraction of the green alga chloroplasts withCa~(2+) to remove the 30--31kD polypeptide (Q_B protein) on the thylakoid surface does notaffect the above Mg~(2+)-induced phenomena. If the Ca~(2+)-treated chloroplasts are further di-gested by trypsin to remove the 23kD and 24kD polypeptides on the membrane surfacethe Mg~(2+)-induced fluorescence effect will completely disappear whereas the property ofMg~(2+)-induced surface charge density changes remains unchanged. These results not onlyshow that the 23kDa and 24kDa polypeptides on the thylakoid surface are the specific act-ing sites of the cation that induce Chla fluorescence change but also demonstrate that thecation-induced change of excitation energy distribution between two photosystems is not con-trolled by the electrostatic property of thylakoid surface in the chloroplasts of Codiumfragile.

In contrast to the chloroplasts from higher plants, Mg2+-induced PS--Ⅱ fluorescence inten-sity increase does not relate to Mg2+-induced surface charge density decrease of thylakoidin the chloroplasts from Codium fragile. Tbe extraction of the green alga chloroplasts withCa2+ to remove the 30--31kD polypeptide （QB protein） on the thylakoid surface does notaffect the above Mg2+-induced phenomena. If the Ca2+-treated chloroplasts are further di-gested by trypsin to remove the 23kD and 24kD polypeptides on the membrane surface,the Mg2+-induced fluorescence effect will completely disappear whereas the property ofMg2+-induced surface charge density changes remains unchanged. These results not onlyshow that the 23kDa and 24kDa polypeptides on the thylakoid surface are the specific act-ing sites of the cation that induce Chla fluorescence change, but also demonstrate that thecation-induced change of excitation energy distribution between two photosystems is not con-trolled by the

关键词： thylakoid photosystem light-harvesting pigment-protein complex

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Component spectroscopic properties of light-harvesting complexes with DFT calculations

引用

BIOCELL 2020年第3期44卷 279-291页

作者： SHYAM BADU SANJAY PRABHAKAR RODERICK MELNIK MS2Discovery Interdisciplinary Research Institute M2Net LabWilfrid Laurier UniversityWaterlooON N3L 3V6Canada Department of Natural Science Gordon State CollegeBarnesvilleGA 30204USA BCAM–Basque Center for Applied Mathematics BilbaoE-48009Spain

Photosynthesis is a fundamental process in biosciences and biotechnology that influences profoundly the research in other *** this paper,we focus on the characterization of fundamental components,present in pigment-protein complexes,in terms of their spectroscopic properties such as infrared spectra,nuclear magnetic resonance,as well as nuclear quadrupole resonance,which are of critical importance for many *** components include chlorophylls and *** on the density functional theory method,we calculate the main spectroscopic characteristics of these components for the Fenna-Matthews-Olson light-harvesting complex,analyze them and compare them with available experimental *** outlook is discussed in the context of current and potential applications of the presented results.

关键词： Photosynthesis Bacteriochlorophylls Light harvesting pigment-protein complexes Density functional theory Complex networks Photocatalysis Biosensing and bioplasmonics

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The photodamage process of pigments and proteins of PSI complexes from Spinacia Oleracea L.

引用

Chinese Science Bulletin 2001年第21期46卷 1812-1816页

作者： WEI Jie YU Hui LI Liangbi KUANG Tingyun WANG Jushuo GONG Yandao ZHAO Nanming Laboratory of Photosynthesis Basic Research Institute of BotanyChinese Academy of SciencesBeijing 100093China Department of Biological Science and Biotechnology Tsinghua UniversityBeijing 100084 China

Purified PSI complexes from Spinacia Oleracea L. were exposed to the strong light (PFD=2300μmol m-2s-1) for various period. Along with the illumination the photo-damage process of pigments and proteins of PSI complexes was investigated using absorption, fluorescence, circular dichroism (CD) spectroscopy and SDS-PAGE. It was found from the optical absorption spectra that the maximal ab-sorbance of PSI complexes decreased and maximal peaks blue-shifted during the illumination, and the forth derivative spectra demonstrated that the absorbance decreasing at red region mainly resulted from the aborbance decreasing of the long wavelength Chla, implying that the long-wavelength Chla was readily to be bleached. The CD signals contributed by LHCI decreased more rapidly than other CD signals con-tributed by Chla and Carotenoid, indicating that the LHCI was more sensitive to light than core complexes. It was observed by SDS-PAGE that some small polypeptides of PSI complexes were damaged earlier than reaction

关键词： PSI pigment-protein complex photodamage LHCI absorption spectra CD spectra.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：