Search for dissertations about: "TRANSMEMBRANE ELECTRON-TRANSFER"

Showing result 1 - 5 of 8 swedish dissertations containing the words TRANSMEMBRANE ELECTRON-TRANSFER.

2. 1. Kinetics of proton and electron transfer in heme-copper oxidases

   Author : Peter Lachmann; Pia Ädelroth; Örjan Hansson; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Heme-copper oxidase; electron transfer; proton transfer; nitric oxide reductase; ba3 oxidase; flow-flash; laser-flash photolysis; Biochemistry; biokemi;

   Abstract : Heme-copper oxidases are transmembrane proteins that are found in aerobic and anaerobic respiratory chains. During aerobic respiration, these enzymes reduce dioxygen to water. The energy released in the reaction is used to transport protons across a biological membrane. READ MORE

4. 2. Regulation of proton-coupled electron transfer in cytochrome c oxidase : The role of membrane potential, proton pathways and ATP

   Author : Markus Björck; Peter Brzezinski; Thorsten Friedrich; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; cytochrome c oxidase; charge transfer; membrane potential; membrane protein; mitochondria; ATP; proton pump; Biochemistry; biokemi;

   Abstract : Cytochrome c oxidase (CytcO) is the final electron acceptor of the respiratory chain. In this chain a current of electrons, derived from degradation of nutrients, along with protons, are used to reduce oxygen to water. The reaction is exergonic and the excess energy is used to pump protons across the membrane. READ MORE

5. 3. Studies of the two redox active tyrosines in Photosystem II

   Author : Nigar Ahmadova; Fikret Mamedov; Stenbjörn Styring; Robert Burnap; Uppsala universitet; []
   Keywords : Photosystem II; Tyrosine Z and D; proton-coupled electron transfer;

   Abstract : Photosystem II is a unique enzyme which catalyzes light induced water oxidation. This process is driven by highly oxidizing ensemble of four Chl molecules, PD1, PD2, ChlD1 and ChlD2 called, P680. Excitation of one of the Chls in P680 leads to the primary charge separation, P680+Pheo-. READ MORE

6. 4. Quinone reduction sites and the role of heme in succinate:quinone reductase. Studies in Bacillus subtilis and Paracoccus denitrificans

   Author : Mikael Matsson; Biologiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; carboxin; cytochrome b; electron transport; heme; quinone; Paracoccus denitrificans; Bacillus subtilis; Succinate:quinone reductase; succinate dehydrogenase; Microbiology; bacteriology; virology; mycology; Mikrobiologi; bakteriologi; virologi; mykologi;

   Abstract : Succinate:quinone reductase (SQR) is an enzyme in the respiratory system of aerobic cells. SQR catalyzes two reactions, the oxidation of succinate to fumarate and the reduction of quinone to quinol. These reactions are coupled by electron transfer within the enzyme from the site of succinate oxidation to the site of quinone reduction. READ MORE

7. 5. On the antiporter-like subunits of respiratory chain Complex I - implications for the evolution and coupling mechanism of the NADH:quinone oxidoreductase enzyme complex

   Author : Cecilie Mathiesen; Biokemi och Strukturbiologi; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Metabolism; Biokemi; metabolism; Biochemistry; mrp; electron transport; respiration; membrane protein;

   Abstract : Complex I or NADH:quinone oxidoreductase is the largest enzyme complex, but the least understood energy coupling site in the respiratory chain of mitochondria and bacteria. No high-resolution structural information exists for this enzyme and the molecular mechanism that couples electron transfer and proton pumping is not understood. READ MORE