Uptake of self-secreted flavins as bound cofactors for extracellular electron transfer in Geobacter species

Energy Environ. Sci., 2014,7, 1357-1361.

Akihiro Okamoto,a   Koichiro Saito,a   Kengo Inoue,b  Kenneth H. Nealson,c   Kazuhito Hashimoto*a , Ryuhei Nakamura*d   

a- Department of Applied Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Japan E-mail: [email protected]kyo.ac.jp 

b- Interdisciplinary Research Organization, University of Miyazaki, 5200 Kihara, Kiyotake, Japan 

c -Departments of Earth Sciences and Biological Sciences, University of Southern California, Los Angeles, USA 

d-Biofunctional Catalysts Research Team, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Japan ,E-mail: ryuhei.nakamura @riken.ac.jp

 

Abstract

 

Geobacter species are among the most efficient current-producing bacterial species, yet their electron-transfer mechanisms have been scarcely investigated at the molecular level. Here, we provide evidence that Geobacter cells secrete and utilize riboflavin as a bound-cofactor in outer-membrane c-type cytochromes. This finding highlights the potential roles of riboflavin as a major electron carrier in current production.

 

Go To  Journal

 

Additional Information

 

Geobacter species are among the most efficient current-producing bacterial species, drawing keen attention as a model micro-organism for the research of microbial fuel cells and bioremediation technology. However, their electron-transfer mechanisms have been scarcely investigated at the molecular level. Here, we provide evidence that Geobacter cells secrete and utilize riboflavin as a bound-cofactor in outer-membrane c-type cytochromes. This highlights the potential roles of riboflavin as a major electron carrier in current production.

 

 

2

Check Also

Bimetallic Cu-Ni catalysts supported on MCM-41 and Ti-MCM-41 porous materials- renewable energy global innovations

Bimetallic Cu-Ni catalysts supported on MCM-41 and Ti-MCM-41 porous materials for hydrodeoxygenation of lignin model compound into transportation fuels