Plastocyanin is a single strand protein of the thylakoid membrane, (molecular weight 10,500), that plays an integral part in photosynthesis. This protein has a copper center, consisting of one copper atom bonded to two nitrogen atoms and two sulfur atoms. This tetrahedral geometry is unusual for copper compounds in nature, but seems to minimize energies of oxidation and reduction for the copper atom at high pH. A representation of the 3D structure of myoglobin, showing coloured alpha helices. ... A thylakoid is part of an internal membrane system of chloroplasts folded repeatedly into a stack of disks called grana. ... The molecular mass of a substance (less accurately called molecular weight and abbreviated as MW) is the mass of one molecule of that substance, relative to the unified atomic mass unit u (equal to 1/12 the mass of one atom of carbon-12). ... Leaf. ... General Name, Symbol, Number copper, Cu, 29 Chemical series transition metals Group, Period, Block 11 , 4, d Density, Hardness 8920 kg/m3, 3. ... Properties For alternative meanings see atom (disambiguation). ... General Name, Symbol, Number Nitrogen, N, 7 Chemical series nonmetals Group, Period, Block 15 (VA), 2, p Density 1. ... Properties For alternative meanings see atom (disambiguation). ... General Name, Symbol, Number sulfur, S, 16 Chemical series nonmetals Group, Period, Block 16 (VIA), 3, p Density, Hardness 1960 kg/m3, 2 Appearance Lemon yellow at STP Atomic properties Atomic weight 32. ... A tetrahedron (plural: tetrahedra) is a polyhedron composed of four triangular faces, three of which meet at each vertex. ... The most fundamental reactions in chemistry are the redox processes. ... Reduction or reducing has several meanings: In mathematics, reduction is the process of manipulating a series of equations or matrices into a desired simpler format. ... pH is a measure of the activity of hydrogen ions (H+) in a solution and, therefore, its acidity or alkalinity. ...

Plastocyanin is involved in electron transport. At photosystem I it reacts with the P700+ complex losing one electron in the process. Plastocyanin replaces the electron by accepting one from cytochrome f of the cytochrome b6f complex. The electron transfer chain (also called the electron transport chain, or simply electron transport), is a series of protein complexers and lipid messengers spanning the inner mitochondrial membrane that accepts electrons from electron donors such as NADH or succinate, shuttles these electrons from within the mitochondrial matrix across the inner... In the process of photosynthesis, light is absorbed by a photosystem (ancient Greek: phos = light and systema = assembly) to begin an energy-producing reaction. ... Cytochrome f is the largest subunit of cytochrome b6f complex (plastoquinol—plastocyanin reductase; EC 1. ... The cytochrome b6f complex (plastoquinol—plastocyanin reductase; EC 1. ...