Integrated analyses of characterization and transcriptome reveal the adaptive response mechanism of Bacillus cereus FCHN 7-1 in cadmium adsorption

文献类型： 外文期刊

第一作者： Chen, Yinyan

作者： Chen, Yinyan;Fang, Zhijia;Ye, Jianzhi;Pan, Xiaowei;Liang, Yaohui;Chen, Yinyan;Fang, Zhijia;Iddrisu, Lukman;Ye, Jianzhi;Gooneratne, Ravi

作者机构：

关键词： Bacillus cereus; Adsorption; Cadmium; Extracellular polymeric substances (EPS); Adaptive response

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：11.3； 五年影响因子：12.4 ）

ISSN： 0304-3894

年卷期： 2025 年 489 卷

页码：

收录情况： SCI

摘要： Cadmium (Cd2+) pollution is a pressing environmental issue that seriously threatens human health. In recent years, microbial extracellular polymeric substances (EPS) have been developed as an eco-friendly and effective solution for heavy metal bioremediation. In this study, Bacillus cereus FCHN 7-1, which was isolated from highly Cd-polluted soils in Hunan Province, China, has strong resistance to Cd2+ and excellent Cd2+ adsorptive capacity. Microscopic analyses showed that B. cereus FCHN 7-1 mainly adsorbed Cd2+ on the surface of EPS via the formation of granule deposits. The Freundlich isotherm was proven to better describe the sorption data with a higher R2 of 0.958, and the pseudo-second-order model fitted the sorption kinetic processes well, with an adsorption capacity of 66.128 mg/g. The variations in zeta potential indicated the occurrence of electrostatic attraction during the Cd2+ adsorption process. XRD, FTIR, 3D-EEM, and XPS analyses revealed that the func- tional groups of the EPS involved in Cd2+ adsorption were mainly C--O, N-H, and COO- groups of proteins in the EPS, which greatly facilitated the adsorption of Cd2+ by forming EPS-metal complexes. Transcriptome sequencing analysis showed that an adaptive response to Cd2+ increased the expression of genes involved in amino acid biosynthesis and metabolism (asnB, alsS, ablA), and ABC transporter pathways (brnQ, abc-f, U2I57_RS23145), which promoted the synthesis of proteins and secretion of abundant EPS. This study pro- vides new insights into the biosorption of Cd2+ for future applications.

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