کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1942130 | 1052578 | 2015 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Redox changes accompanying inorganic carbon limitation in Synechocystis sp. PCC 6803
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کلمات کلیدی
2PGα-KGRuBisCONADPHRuBPCBBCEFCO2 concentrating mechanismCCm - CCMLinear electron flow - جریان الکتریکی خطیCyclic electron flow - جریان الکتریکی سیسیکPhotosynthetic electron transport - حمل و نقل الکترونی فتوسنتزribulose bisphosphate carboxylase/oxygenase - ریبولوز بیسفسفات کربوکسیلاز / اکسیژنازribulose bisphosphate - ریوبولوز بیسفسفاتCyanobacteria - سیانوباکتریهاPhotosynthesis - فتوسنتزFluorescence - فلورسنسLef - لفcarbon concentrating mechanism - مکانیسم تمرکز کربنplastoquinone - پلواستیکینونGly - گلیGlycolaldehyde - گلیکولالدئید
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Inorganic carbon (Ci) is the major sink for photosynthetic reductant in organisms capable of oxygenic photosynthesis. In the absence of abundant Ci, the cyanobacterium Synechocystis sp. strain PCC6803 expresses a high affinity Ci acquisition system, the CO2-concentrating mechanisms (CCM), controlled by the transcriptional regulator CcmR and the metabolites NADP+ and α-ketoglutarate, which act as co-repressors of CcmR by modulating its DNA binding. The CCM thus responds to internal cellular redox changes during the transition from Ci-replete to Ci-limited conditions. However, the actual changes in the metabolic state of the NADPH/NADP+ system that occur during the transition to Ci-limited conditions remain ill-defined. Analysis of changes in the redox state of cells experiencing Ci limitation reveals systematic changes associated with physiological adjustments and a trend towards the quinone and NADP pools becoming highly reduced. A rapid and persistent increase in F0 was observed in cells reaching the Ci-limited state, as was the induction of photoprotective fluorescence quenching. Systematic changes in the fluorescence induction transients were also observed. As with Chl fluorescence, a transient reduction of the NADPH pool ('M' peak), is assigned to State 2â State 1 transition associated with increased electron flow to NADP+. This was followed by a characteristic decline, which was abolished by Ci limitation or inhibition of the Calvin -Benson-Bassham (CBB) cycle and is thus assigned to the activation of the CBB cycle. The results are consistent with the proposed regulation of the CCM and provide new information on the nature of the Chl and NADPH fluorescence induction curves.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - Bioenergetics - Volume 1847, Issue 3, March 2015, Pages 355-363
Journal: Biochimica et Biophysica Acta (BBA) - Bioenergetics - Volume 1847, Issue 3, March 2015, Pages 355-363
نویسندگان
Steven C. Holland, Anthony D. Kappell, Robert L. Burnap,