Nanowires, Capacitors, and Other Novel Outer-Surface Components Involved in Electron Transfer to Fe(III) Oxides in Geobacter Species

Lovley, Derek, R.

关键词: ABUNDANCE;    BIOREMEDIATION;    CAPACITORS;    CYTOCHROMES;    ELECTRON TRANSFER;    ELECTRONS;    GENES;    IRON OXIDES;    MICROORGANISMS;    MONITORING;    OXIDES;    TARGETS;    URANIUM Electron transfer;    Geobacter;   

DOI  :  10.2172/944620
RP-ID  :  DOE/FG/63423
PID  :  OSTI ID: 944620
Others  :  TRN: US201107%%23

学科分类：环境科学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

The overall goal of this project was to better understand the mechanisms by which Geobacter species transfer electrons outside the cell onto Fe(III) oxides. The rationale for this study was that Geobacter species are often the predominant microorganisms involved in in situ uranium bioremediation and the growth and activity of the Geobacter species during bioremediation is primarily supported by electron transfer to Fe(III) oxides. These studies greatly expanded the understanding of electron transfer to Fe(III). Novel concepts developed included the potential role of microbial nanowires for long range electron transfer in Geobacter species and the importance of extracytoplasmic cytochromes functioning as capacitors to permit continued electron transfer during the hunt for Fe(III) oxide. Furthermore, these studies provided target sequences that were then used in other studies to tract the activity of Geobacter species in the subsurface through monitoring the abundance of gene transcripts of the target genes. A brief summary of the major accomplishments of the project is provided.