Reduction of Fe(III), Mn(IV), and Toxic Metals at 100°C by Pyrobaculum islandicum

Reduction of Fe(III), Mn(IV), and Toxic Metals at 100°C by Pyrobaculum islandicum

Characterization of extracellular minerals produced during dissimilatory Fe(III) and U(VI) reduction at 100 degrees C by Pyrobaculum islandicum.

In order to gain insight into the significance of biotic metal reduction and mineral formation in hyperthermophilic environments, metal mineralization as a result of the dissimilatory reduction of poorly crystalline Fe(III) oxide, and U(VI) reduction at 100 degrees C by Pyrobaculum islandicum was investigated. When P. islandicum was grown in a medium with poorly crystalline Fe(III) oxide as an ...

Insight into thermostability of a UDP-glucose dehydrogenase from the hyperthermophilic archaeon Pyrobaculum islandicum

Haruhiko Sakuraba*, Kazunari Yoneda, Toshihisa Ohshima 1 Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, 2393 Ikenobe, Miki-cho, Kita-gun, Kagawa761-0795, Japan Department of Bioscience, School of Agriculture, Tokai University, Kumamoto, Japan Department of Biomedical Engineering, Faculty of Engineering, Osaka Institute of Technology, 5-16-1 Omiya Asahi-ku, ...

Purification and characterization of a [3Fe-4S][4Fe-4S] type ferredoxin from hyperthermophilic archaeon, Pyrobaculum islandicum.

A ferredoxin was purified from the hyperthermophilic archaeon, Pyrobaculum islandicum. EPR spectra and metal content analyses suggested that the ferredoxin molecule contained one [3Fe-4S] and one [4Fe-4S] cluster. The ferredoxin was rapidly reduced by 2-oxoglutarate: ferredoxin oxidoreductase purified from P. islandicum, indicating that it functions physiologically as an electron sink for the r...

Preferential reduction of FeIII over fumarate by Geobacter sulfurreducens.

The presence of Fe(III), but not that of Fe(II), resulted in ca. 20-fold-lower levels of mRNA for fumarate reductase, inhibiting fumarate reduction and favoring utilization of fumarate as an electron donor in chemostat cultures of Geobacter sulfurreducens, despite the fact that growth yield with fumarate was 3-fold higher than with Fe(III).