Magnetite reducing bacteria

[soungalo]

Hello
I'm interested in microorganisms that are capable of reducing magnetite (Fe3O4) or other iron oxide. I found this rather old article :
http://www.ncbi.nlm.nih.gov/pubmed/11539843
This article centers around the reduction of magnetite by Shewanella, when coupled to oxidation of organic compounds. However, despite my efforts to find additional information about the process, I could not find anything useful. I'm especially interested in studies of the molecular or enzymatic mechanism of reduction.
I would appreciate any hints or references, if anyone here knows anything about this matter. If this is not the right place to ask, please direct me to a more apropriate forum or group.
Thanks a lot !