Theory of Electron Transport in Disordered Systems: The Nearly Free‐Electron and Nearly Bound‐Electron Limits

1969 ◽  
Vol 51 (8) ◽  
pp. 3352-3360 ◽  
Author(s):  
Sighart Fischer ◽  
Stuart A. Rice
Keyword(s):  
Electron Transport ◽  
Free Electron ◽  
Disordered Systems ◽  
Bound Electron

Electron Transport to Assimilatory Nitrate Reductase in A zotobacter vinelandii

1981 ◽  
Vol 36 (11-12) ◽  
pp. 1030-1035 ◽  
Author(s):  
Hermann Bothe ◽  
Klaus-Peter Häger
Keyword(s):  
Electron Transport ◽  
Nitrate Reductase ◽  
Nitrate Reduction ◽  
Azotobacter Vinelandii ◽  
Additive Effects ◽  
Electron Carrier ◽  
Transport Chain ◽  
Solubilized Enzyme ◽  
Electron Carriers ◽  
Bound Electron

Abstract Assimilatory nitrate reductase was particle-bound in extracts from Azotobacter vinelandii. Nitrate reduction by particle fractions was dependent on NADPH and a particle-bound electron carrier. When the enzyme was solubilized from the particles by treatment with detergents, the particle-bound electron carrier could be substituted by ferredoxin or flavodoxin. Flavodoxin reduced at the expense of photoreduced deazaflavin was much more efficient than ferredoxin in transferring electrons to nitrate reductase. The addition of both ferredoxin and flavodoxin to the assays with photoreduced deazaflavin gave additive effects. With the solubilized enzyme, NADPH only poorly supported nitrate reduction even after the addition of electron carriers. The experiments indicate that A. vinelandii utilizes an electron transport chain between NADPH and nitrate reductase with some properties similar to those described for the generation of reductants to nitrogenase.

scholarly journals Function of Ech Hydrogenase in Ferredoxin-Dependent, Membrane-Bound Electron Transport in Methanosarcina mazei

2009 ◽  
Vol 192 (3) ◽  
pp. 674-678 ◽  
Author(s):  
Cornelia Welte ◽  
Verena Kallnik ◽  
Marcel Grapp ◽  
Gunes Bender ◽  
Steve Ragsdale ◽  
...  
Keyword(s):  
Electron Transport ◽  
Transport Activity ◽  
Heterodisulfide Reductase ◽  
Lower Growth ◽  
Methanosarcina Mazei ◽  
Electron Transport Activity ◽  
Lower Growth Rate ◽  
Membrane Bound ◽  
Integral Proteins ◽  
Bound Electron

ABSTRACT Reduced ferredoxin is an intermediate in the methylotrophic and aceticlastic pathway of methanogenesis and donates electrons to membrane-integral proteins, which transfer electrons to the heterodisulfide reductase. A ferredoxin interaction has been observed previously for the Ech hydrogenase. Here we present a detailed analysis of a Methanosarcina mazei Δech mutant which shows decreased ferredoxin-dependent membrane-bound electron transport activity, a lower growth rate, and faster substrate consumption. Evidence is presented that a second protein whose identity is unknown oxidizes reduced ferredoxin, indicating an involvement in methanogenesis from methylated C1 compounds.

scholarly journals Inhibition of membrane-bound electron transport of the methanogenic archaeonMethanosarcina mazeiGö1 by diphenyleneiodonium

1999 ◽  
Vol 259 (1-2) ◽  
pp. 218-224 ◽  
Author(s):  
Jens Brodersen ◽  
, Sebastian Bäumer ◽  
, Hans-Jörg Abken ◽  
, Gerhard Gottschalk ◽  
Uwe Deppenmeier
Keyword(s):  
Electron Transport ◽  
Membrane Bound ◽  
Bound Electron

Membrane-bound, Electron Transport-linked,d-Glucose Dehydrogenase ofPseudomonas fluorescens. Interaction of the Purified

1982 ◽  
Vol 46 (4) ◽  
pp. 1007-1011
Author(s):  
Kazunobu Matsushita ◽  
Yasue Ohno ◽  
Emiko Shinagawa ◽  
Osao Adachi ◽  
Minoru Ameyama
Keyword(s):  
Electron Transport ◽  
Glucose Dehydrogenase ◽  
Membrane Bound ◽  
Bound Electron
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