Characterization and influence factors of Fe(III) reduction of Shewanella cinica D14T]

This is the first time to described the dissimilatory Fe(III) reducing characteristics of Shewanella cinica D14T. The effects of O2, light, temperature and pH on dissimilatory Fe(III) reduction were examined. The results suggested that the rate of Fe(III) reduction decreased with increasing Fe(III) concentration. Fe(III) reduction was partially inhibited by the presence of either O2 or light. The optimum temperature for Fe(III) reduction is 37 degrees C. At pH 6.0-10.0, strain D14T can reduce Fe(III). The soluble Fe(III) is more easy to be reduced than the insoluble one. Results of protein denaturants SDS and OGP suggest that the Fe(III) reduction activity of S. cinica is mostly localized to the soluble outer membrane fraction. The azo dye decolorization and Fe(III) reduction in strain D14T were enhanced in the presence of Fe(III) and dye.