By a News Reporter-Staff News Editor at Life Science Weekly -- Researchers detail new data in Supramolecular Research. According to news originating from Shanghai, People's Republic of China, by NewsRx correspondents, research stated, "It is well known that disassembly of PSIILHCII complexes is required for chlorophyll degradation and D1 repair. We discovered that a pH-dependent Lhcb-interacting protein THF1 plays a dual role in regulation of PSIILHCII complexes in excess light and leaf senescence.In higher plants, photosystem II (PSII) is a large pigmentprotein supramolecular complex composed of the PSII core complex and the plant-specific peripheral light-harvesting complexes (LHCII)."
Our news journalists obtained a quote from the research from the Institute of Plant Physiology, "PSIILHCII complexes are highly dynamic in their quantity and macro-organization to various environmental conditions. In this study, we reported a critical factor, the Arabidopsis Thylakoid Formation 1 (THF1) protein, which controls PSIILHCII dynamics during dark-induced senescence and light acclimation. Loss-of-function mutations in THF1 lead to a stay-green phenotype in pathogen-infected and senescent leaves. Both LHCII and PSII core subunits are retained in dark-induced senescent leaves of thf1, indicative of the presence of PSIILHCII complexes. Blue native (BN)-polyacrylamide gel electrophoresis (PAGE) and immunoblot analysis showed that, in dark- and high-light-treated thf1 leaves, a type of PSIILHCII megacomplex is selectively retained while the stability of PSIILHCII supercomplexes significantly decreased, suggesting a dual role of THF1 in dynamics of PSIILHCII complexes. We showed further that THF1 interacts with Lhcb proteins in a pH-dependent manner and that the stay-green phenotype of thf1 relies on the presence of LHCII complexes."
According to the news editors, the research concluded: "Taken together, the data suggest that THF1 is required for dynamics of PSIILHCII supramolecular organization in higher plants."
For more information on this research see: Arabidopsis Thylakoid Formation 1 Is a Critical Regulator for Dynamics of PSII-LHCII Complexes in Leaf Senescence and Excess Light. Molecular Plant, 2013;6(5):1673-1691. Molecular Plant can be contacted at: Oxford Univ Press, Great Clarendon St, Oxford OX2 6DP, England. (Oxford University Press - www.oup.com/; Molecular Plant - mplant.oxfordjournals.org)
The news correspondents report that additional information may be obtained from W.H. Huang, Chinese Academy Sci, Shanghai Inst Biol Sci, Inst Plant Physiol & Ecol, Natl Key Lab Plant Mol Genet, Shanghai 200032, People's Republic of China. Additional authors for this research include Q.B. Chen, Y. Zhu, F.H. Hu, L.G. Zhang, Z.X. Ma, Z.H. He and J.R. Huang (see also Supramolecular Research).
Keywords for this news article include: Asia, Shanghai, Nanotechnology, Emerging Technologies, Supramolecular Research, People's Republic of China
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