کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5760197 | 1623797 | 2017 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Modeling the light-induced electric potential difference (ÎΨ), the pH difference (ÎpH) and the proton motive force across the thylakoid membrane in C3 leaves
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کلمات کلیدی
OATPQA, QBCOSPCytb6fΔpHCalvin-Benson cyclePSI, PSIIFNRNPQCBCGHKNADPHPFDPMFOECΔψ - ΔρAdenosine Triphosphate - آدنوزین تری فسفاتATP - آدنوزین تری فسفات یا ATPLET - اجازه دهیدopen probability - احتمال باز بودنCyclic electron transport - انتقال الکترون سیسیلlinear electron transport - انتقال الکتریکی خطیOxygen evolving complex - اکسیژن تکامل یافته پیچیده استCET - اینphoton flux density - تراکم شار فوتونElectrochromic shift - تغییر الکتروکرومیcytochrome b6f - سیتوکروم b6fBuffer capacity - ظرفیت بافرPhotosynthesis - فتوسنتزFerredoxin - فریدوکسیینlight harvesting complexes - مجتمع های برداشت کم نورproton motive force - نیروی حرکتی پروتونPlastocyanin - پلاستوسیانینplastoquinone - پلواستیکینونreduced nicotinamide adenine dinucleotide phosphate - کاهش نیکوتین آمید آدنین دینکلوتید فسفاتsingle turnover - گردش مالی تک
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم کشاورزی و بیولوژیک (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A model was constructed which includes electron transport (linear and cyclic and Mehler type reaction) coupled to proton translocation, counter ion movement, ATP synthesis, and Calvin-Benson cycle. The focus is on modeling of the light-induced total electric potential difference (ÎΨ) which in this model originates from the bulk phase electric potential difference (ÎΨb), the localized electric potential difference (ÎΨc), as well as the surface electric potential difference (ÎΨs). The measured dual wavelength transmittance signal (ÎA515-560 nm, electrochromic shift) was used as a proxy for experimental ÎΨ. The predictions for theoretical ÎΨ vary with assumed contribution of ÎΨs, which might imply that the measured ÎA515-560 nm trace on a long time scale reflects the interplay of the ÎΨ components. Simulations also show that partitioning of proton motive force (pmf) to ÎΨb and ÎpH components is sensitive to the stoichiometric ratio of H+/ATP, energy barrier for ATP synthesis, ionic strength, buffer capacity and light intensity. Our model shows that high buffer capacity promotes the establishment of ÎΨb, while the formation of pHi minimum is not 'dissipated' but 'postponed' until it reaches the same level as that for low buffer capacity. Under physiologically optimal conditions, the output of the model shows that at steady state in light, the ÎpH component is the main contributor to pmf to drive ATP synthesis while a low ÎΨb persists energizing the membrane. Our model predicts 11 mV as the resting electric potential difference across the thylakoid membrane in dark. We suggest that the model presented in this work can be integrated as a module into a more comprehensive model of oxygenic photosynthesis.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Theoretical Biology - Volume 413, 21 January 2017, Pages 11-23
Journal: Journal of Theoretical Biology - Volume 413, 21 January 2017, Pages 11-23
نویسندگان
Hui Lyu, DuÅ¡an Lazár,