کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1943250 | 1052657 | 2008 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Oxygen evolution in the thylakoid-lacking cyanobacterium Gloeobacter violaceus PCC 7421
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
ChlDCMU3-(3,4-Dichlorophenyl)-1,1-dimethylurea - 3- (3،4-Dichlorophenyl) -1،1-dimethylureaoxygen evolution - تکامل اکسیژنChlorophyll - سبزینه یا کلروفیلCyanobacteria - سیانوباکتریهاPhotosystem - سیستم عکسPhotosystem II - فتوسیستم 2Delayed luminescence - لنز دلخواهExtrinsic protein - پروتئین خارجیPlastocyanin - پلاستوسیانینplastoquinone - پلواستیکینون
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The oxygen-evolving reactions of the thylakoid-lacking cyanobacterium Gloeobacter violaceus PCC 7421 were compared with those of Synechocystis sp. PCC 6803. Four aspects were considered: sequence conservation in three extrinsic proteins for oxygen evolution, steady-state oxygen-evolving activity, charge recombination reactions, i.e., thermoluminescence and oscillation patterns of delayed luminescence on a second time scale and delayed fluorescence on the nanosecond time scale at â 196 °C. Even though there were significant differences between the amino acid sequences of extrinsic proteins in G. violaceus and Synechocystis sp. PCC 6803, the oxygen-evolving activities were similar. The delayed luminescence oscillation patterns and glow curves of thermoluminescence were essentially identical between the two species, and the nanosecond delayed fluorescence spectral profiles and lifetimes were also very similar. These results indicate clearly that even though the oxygen-evolving reactions are carried out in the periplasm by components with altered amino acid sequences, the essential reaction processes for water oxidation are highly conserved. In contrast, we observed significant changes on the reduction side of photosystem II. Based on these data, we discuss the oxygen-evolving activity of G. violaceus.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - Bioenergetics - Volume 1777, Issue 4, April 2008, Pages 369-378
Journal: Biochimica et Biophysica Acta (BBA) - Bioenergetics - Volume 1777, Issue 4, April 2008, Pages 369-378
نویسندگان
Kohei Koyama, Hiroyuki Suzuki, Takumi Noguchi, Seiji Akimoto, Tohru Tsuchiya, Mamoru Mimuro,