Response mechanism of extracellular polymers in the remediation of chromium pollution by carbonate mineralizing bacteria.

ABSTRACT: This study examines the adaptability of carbonate mineralizing bacteria in Cr(iii)-contaminated environments with varying Cr(iii) concentrations and their response mechanism via EPS. Cr(iii) removal efficiency declined with concentrations exceeding 1000 mg L^-1, while the removal amount continued to rise, indicating strong Cr(iii) tolerance in the bacterium. Analysis of dynamic changes in EPS revealed a significant increase in production, with polysaccharides and proteins playing key roles in Cr(iii) binding. A notable increase in mannose in the monosaccharide composition of EPS suggests its involvement in Cr(iii) binding. Moreover, alterations in the protein secondary structure, such as a reduction in α-helix content and an increase in β-sheet and random coil structures,

SUBMITTER: Shen Y 

PROVIDER: S-EPMC12070257 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature