کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10796119 | 1052694 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Entropy-assisted stacking of thylakoid membranes
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کلمات کلیدی
PSIThylakoid stackingChlPSIIRuBisCOHEPESribulose 1,5-bisphosphate carboxylase/oxygenase - 1،5-bisphosphate carboxylase / oxygenase گیاه ریوبولوزBSA - BSAAdenosine Triphosphate - آدنوزین تری فسفاتATP - آدنوزین تری فسفات یا ATPbovine serum albumin - آلبومین سرم گاوEntropy - آنتروپیMacromolecular crowding - اغتشاش زیادChloroplast ultrastructure - اولتراسونیک کلرفلستDepletion attraction - جاذبه ضعفChlorophyll - سبزینه یا کلروفیلphotosystem I - عکس سیستم منPhotosystem II - فتوسیستم 2Grana - گرانا
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Chloroplasts in plants and some green algae contain a continuous thylakoid membrane system that is structurally differentiated into stacked granal membranes interconnected by unstacked thylakoids, the stromal lamellae. Experiments were conducted to test the hypothesis that the thermodynamic tendency to increase entropy in chloroplasts contributes to thylakoid stacking to form grana. We show that the addition of bovine serum albumin or dextran, two very different water-soluble macromolecules, to a suspension of envelope-free chloroplasts with initially unstacked thylakoids induced thylakoid stacking. This novel restacking of thylakoids occurred spontaneously, accompanied by lateral segregation of PSII from PSI, thereby mimicking the natural situation. We suggest that such granal formation, induced by the macromolecules, is partly explained as a means of generating more volume for the diffusion of macromolecules in a crowded stromal environment, i.e., greater entropy overall. This mechanism may be relevant in vivo where the stroma has a very high concentration of enzymes of carbon metabolism, and where high metabolic fluxes are required.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - Bioenergetics - Volume 1708, Issue 2, 30 June 2005, Pages 187-195
Journal: Biochimica et Biophysica Acta (BBA) - Bioenergetics - Volume 1708, Issue 2, 30 June 2005, Pages 187-195
نویسندگان
Eun-Ha Kim, Wah Soon Chow, Peter Horton, Jan M. Anderson,