کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10796151 | 1052697 | 2005 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Sequential assembly of photosynthetic units in Rhodobacter sphaeroides as revealed by fast repetition rate analysis of variable bacteriochlorophyll a fluorescence
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کلمات کلیدی
PSIIICMLH2LH1Membrane developmentBChl acore light-harvesting complexbc1 Complex - bc1 مجتمعbacteriochlorophyll a - باکتری کلروفیل aminimal fluorescence yield - حداقل عملکرد فلورسانسmaximal fluorescence yield - حداکثر عملکرد فلورسانسIntracytoplasmic membrane - غشای داخل تراشهCytoplasmic membrane - غشای سیتوپلاسمیphotosynthetic membrane - غشای فتوسنتزیPhotosystem II - فتوسیستم 2Light-harvesting complex - مجتمع جمع آوری نور
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Sequential assembly of photosynthetic units in Rhodobacter sphaeroides as revealed by fast repetition rate analysis of variable bacteriochlorophyll a fluorescence Sequential assembly of photosynthetic units in Rhodobacter sphaeroides as revealed by fast repetition rate analysis of variable bacteriochlorophyll a fluorescence](/preview/png/10796151.png)
چکیده انگلیسی
The development of functional photosynthetic units in Rhodobacter sphaeroides was followed by near infra-red fast repetition rate (IRFRR) fluorescence measurements that were correlated to absorption spectroscopy, electron microscopy and pigment analyses. To induce the formation of intracytoplasmic membranes (ICM) (greening), cells grown aerobically both in batch culture and in a carbon-limited chemostat were transferred to semiaerobic conditions. In both aerobic cultures, a low level of photosynthetic complexes was observed, which were composed of the reaction center and the LH1 core antenna. Interestingly, in the batch cultures the reaction centers were essentially inactive in forward electron transfer and exhibited low photochemical yields FV/FM, whereas the chemostat culture displayed functional reaction centers with a rather rapid (1-2 ms) electron transfer turnover, as well as a high FV/FM of â¼0.8. In both cases, the transfer to semiaerobiosis resulted in rapid induction of bacteriochlorophyll a synthesis that was reflected by both an increase in the number of LH1-reaction center and peripheral LH2 antenna complexes. These studies establish that photosynthetic units are assembled in a sequential manner, where the appearance of the LH1-reaction center cores is followed by the activation of functional electron transfer, and finally by the accumulation of the LH2 complexes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - Bioenergetics - Volume 1706, Issue 3, 17 February 2005, Pages 220-231
Journal: Biochimica et Biophysica Acta (BBA) - Bioenergetics - Volume 1706, Issue 3, 17 February 2005, Pages 220-231
نویسندگان
Michal KoblÃzek, Joseph D. Shih, Seth I. Breitbart, Emma C. Ratcliffe, Zbigniew S. Kolber, C. Neil Hunter, Robert A. Niederman,