The elongated Cu-thioether bond appears to destabilise the CuII state thereby enhancing its oxidizing power. Plastocyanin is a small, acidic, blue copper protein found in most oxygenic phototrophs. It was surprising to find these organisms containing the protein plastocyanin because the concentration of copper dissolved in the ocean is usually low (between 0.4 – 50 nM). Plastocyanin consists of amino acid groups in association with a copper molecule which gives this compound a blue colour. These hydrophobic and acidic patches are believed to be the recognition/binding sites for the other proteins involved in electron transfer. The chlorophyll captures energy from the sun and converts it into chemical energy which is stored in adenosine triphosphate and nicotinamide adenine dinucleotide phosphate molecules. A copper-containing protein called plastocyanin (PC) carries electrons at one point in the electron transport chain. The geometry of the copper binding site is described as a ‘distorted trigonal pyramidal’. : a copper-containing protein that acts as an intermediary in photosynthetic electron transport. What is the coordination geometry about each copper ion? Plastocyanin is a copper-binding protein whose function in the Z-scheme of photosynthesis is the catalysis of electron transfer from cytochrome f in the b 6 f complex to P700 + in Photosystem I. What is the subunit composition? Plastocyanin is a soluble copper-containing protein present in the thylakoid lumen, which transfers electrons to photosystem I. Slippery Words Quiz—Changing with the Times. 'Nip it in the butt' or 'Nip it in the bud'. The photosynthetic electron transfer system consists of the electron carriers such as ferredoxin, plastocyanin, cytochromes, plastoquinone, and manganese. In the first step, energy from light is stored in the bonds of adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). Learn a new word every day. Meaning of plastocyanin. 2:57 Plastocyanin in its oxidized (1bxu) and reduced (1bxv) state from Synechococcus sp. This protein has a copper center, consisting of one copper atom surrounded by two nitrogen bonds and two sulfur bonds. Please tell us where you read or heard it (including the quote, if possible). plastocyanin A blue copper-containing protein that is found in chloroplasts and acts as an electron carrier molecule in the light-dependent reactions of photosynthesis (see photophosphorylation). While the molecular surface of the protein near the copper binding site varies slightly, all plastocyanins have a hydrophobic surface surrounding the exposed histidine of the copper binding site. The function of plastocyanin and its interaction with a specific antibody. Plastocyanin (Cu2+Pc) is reduced (an electron is added) by cytochrome f according to the following reaction: After dissociation, Cu+Pc diffuses through the lumen space until recognition/binding occurs with P700+, at which point P700+ oxidizes Cu+Pc according to the following reaction: The redox potential is about 370 mV[5] and the isoelectric pH is about 4. Many cyanobacterial plastocyanins have 107 amino acids. Definition of plastocyanin in the Definitions.net dictionary. The thylakoid lumen contains the oxygen-evolving complex and plastocyanin. The Cu-S (cys) contact is much shorter (207 picometers) than Cu-S (met) (282 pm) bond. Another was to rephrase the function of plastocyanin is that it can facilitate the electron transfer reaction by providing a small reorganization energy, which has been measured to about 16-28 kcal/mol. The most common form of plastoquinone, known as PQ-A or PQ-9, is a 2,3-dimethyl-1,4- benzoquinone molecule with a … Photosynthesis Definition Photosynthesis is the biochemical pathway which converts the energy of light into the bonds of glucose molecules. A cytoplasmic factor, controlled by or interacting with the nucleus, which determines differentiation of a plastid. PCC 7942. Plastocyanin definition: a blue protein found in green plants and in some bacteria | Meaning, pronunciation, translations and examples What does plastocyanin mean? View protein in InterPro IPR000923, BlueCu_1 IPR028871, BlueCu_1_BS IPR001235, Copper_blue_Plastocyanin IPR008972, Cupredoxin IPR002387� Pfam i View protein in Pfam PF00127 , Copper-bind, 1 However, the concentration of copper in the oceans is comparatively higher compared to the concentrations of other metals such as zinc and iron. 'All Intensive Purposes' or 'All Intents and Purposes'? Biology Article. Hauska G, Hurt E, Gabellini N and Lockau W (1983) Comparison of aspects of the quinol-cytochrome c/plastocyanin oxido-reductases. plastocyanin hydrophobic patch impairs electron transfer to photosystem Chlorophyll b-containing oxygenic photosynthetic prokaryotes: oxychlorobacteria (prochlorophytes) In vitro experiment carried out by Kimimura and Katoh [11] confirmed that the heavy metals are able to inhibit plastocyanin , which appears to be an important electron transporter in photosystems. A daily challenge for crossword fanatics. Cytochrome f acts as an electron donor while P700+ accepts electrons from reduced plastocyanin. How to use a word that (literally) drives some pe... Do you know these earlier meanings of words? Plastogene definition is - a submicroscopic factor or determiner reported to be present in the plastids in plant cells and to influence physiological and hereditary phenomena of the plastids. Plastoquinone. Plastocyanin is believed to work less like an enzyme where enzymes decrease the transition energy needed to transfer the electron. Other organisms that live in the ocean, such as phytoplankton, have adapted to where they do not need these low concentration metals (Fe and Zn) to facilitate photosynthesis and grow. Algal plastocyanins, and those from vascular plants in the family Apiaceae, contain similar acidic residues but are shaped differently from those of plant plastocyanins—they lack residues 57 and 58. In plant plastocyanins, acidic residues are located on either side of the highly conserved tyrosine-83. Accessed 25 Jan. 2021. What changes occur during oxidation-reduction reactions? In its essence, photosynthesis is a process that takes water, carbon dioxide, and the energy from sunlight to create glucose molecules while releasing oxygen as a byproduct. The protein is a prototype of the blue copper proteins, a family of intensely blue-colored metalloproteins. 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