Journal
3 BIOTECH
Volume 9, Issue 3, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s13205-019-1641-8
Keywords
EPS; Pseudochrobactrum saccharolyticum LY10; Cr(VI) reduction; Subcellular distribution; Soft X-ray spectromicroscopy
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Funding
- Hangzhou Science & Technology Planning Program [20120433B46]
- National High-Tech Research and Development Program of China [2009AA063101]
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A better understanding of the Cr(VI) reduction position and mechanisms by a Cr(VI)-reducing strain is important for the bioremediation of Cr pollution in the environment. In the present study, we were interested in figuring out the role of extracellular polymeric substances (EPS) as the main area for Cr(VI) reduction in the newly reported strain of Pseudochrobactrum saccharolyticum LY10. We investigated the subcellular distribution and reduction capability of each cellular component as the main area of Cr(VI) reduction by scanning electron microscopy and soft X-ray spectromicroscopy. The results suggested that most of Cr was presented in the supernatants as Cr(III) after reduction. In the cells, Cr was mostly distributed in the EPS and cell wall, while the EPS had the maximum Cr(VI) reduction rate (81.5%) as compared with the cell wall (30.1%). Soft X-ray spectromicroscopy analysis indicated that Cr accumulated more in the EPS. Therefore, the results suggested that the EPS were the main area for Cr(VI) reduction in the bacteria of P. saccharolyticum LY10.
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