Q b is also a plastoquinone (pq) which can accept two electrons successively from q a − and together with two protons (h +) from the stroma or cytoplasm to form plastoquinol (pqh 2). Like the cytochromes, quinones have important roles in carrying electrons between the components of the light reactions. The structure of cyanobacterial psii has been determined at high resolution, and comprises 17 transmembrane protein subunits, three peripheral proteins, 35 chlorophylls and several additional cofactors, including the catalytic machinery required for water splitting.
The structures of plastoquinone A and its reduced form
This review offers a concise overview of the recent improvements in the understanding of structure and function of psii donor side, with focus on the interactions of the plastoquinone cofactors with the surrounding environment and operational features.
Small molecules called plastoquinones are found in substantial numbers in the lamellae.
Structurally, plastoquinone is composed of nine isoprenyl units with 45 c atoms in the side chain and it is structurally similar to ubiquinone. All of these proteins and cofactors are virtually identical to the 2.9 å crystal structure of native psiicc. 19) structures of electron the carriers plastoquinone (pq) from the thylakoid membrane and ubiquinone (uq) from the mitochondrial membrane are shown below. Furthermore, studies focused on photosynthetic proteins structure/function/dynamics and.
The obtained final model contains the following per monomer:
Furthermore, studies focused on photosynthetic proteins structure/function/dynamics and. In addition to the model of native psiicc, four. Giving reference to the two structures, provide a rationale for the observed difference in standard biochemical reduction potential (see values below). Since they are lipid soluble, they can diffuse through the membrane.
This review offers a concise overview of the recent improvements in the understanding of structure and function of psii donor side, with focus on the interactions of the plastoquinone cofactors with the surrounding environment and operational features.
The overall process comprises three types of reaction sequences: This review offers a concise overview of the recent improvements in the understanding of structure and function of psii donor side, with focus on. Based on the tests performed, there was a significant. (1 pt) in the mitochondrial electron.
A chemical structure of a molecule includes the arrangement of atoms and the chemical bonds that hold the atoms together.
Plastoquinone is localized in the inner thylakoid membrane of chloroplasts.
