Organization of Plant Photosystem II and Photosystem I Supercomplexes

• Published in: Sub-cellular biochemistry Vol. 87; p. 259
• Main Authors: Kouřil, Roman, Nosek, Lukáš, Semchonok, Dmitry, Boekema, Egbert J, Ilík, Petr
• Format: Journal Article
• Language: English
• Published: United States 01.01.2018
• Subjects: Photosynthesis - physiology; Photosystem I Protein Complex - chemistry; Photosystem I Protein Complex - metabolism; Photosystem II Protein Complex - chemistry; Photosystem II Protein Complex - metabolism; Thylakoids - enzymology; Photosystem I; Supercomplex; Photosystem II; Megacomplex; Electron microscopy; Clear native gel electrophoresis
• ISSN: 0306-0225
• DOI: 10.1007/978-981-10-7757-9_9

In nature, plants are continuously exposed to varying environmental conditions. They have developed a wide range of adaptive mechanisms, which ensure their survival and maintenance of stable photosynthetic performance. Photosynthesis is delicately regulated at the level of the thylakoid membrane of chloroplasts and the regulatory mechanisms include a reversible formation of a large variety of specific protein-protein complexes, supercomplexes or even larger assemblies known as megacomplexes. Revealing their structures is crucial for better understanding of their function and relevance in photosynthesis. Here we focus our attention on the isolation and a structural characterization of various large protein supercomplexes and megacomplexes, which involve Photosystem II and Photosystem I, the key constituents of photosynthetic apparatus. The photosystems are often attached to other protein complexes in thylakoid membranes such as light harvesting complexes, cytochrome b f complex, and NAD(P)H dehydrogenase. Structural models of individual supercomplexes and megacomplexes provide essential details of their architecture, which allow us to discuss their function as well as physiological significance.