Reducing cadmium accumulation in shrimp using Escherichia coli with surface-displayed peptide

作者：Liu, Minrui^*; Qi, Xing-e; Han, Jiangyuan; Ni, Hongyuhang; Zhao, Shuqin

来源：Ecotoxicology and Environmental Safety, 2023, 256: 114858.

DOI：10.1016/j.ecoenv.2023.114858

• Cadmium adsorption
• Cell surface display
• Shrimp
• Gut microbiota

Cadmium (Cd) is a hazardous metal that can accumulate in aquatic organisms and endanger human health via the food chain. In this study, genetic engineering was used to display a peptide with Cd-binding potential on the surface of Escherichia coli cells. This whole-cell adsorbent exhibited high affinity for Cd ions (Cd2+) in the so-lution. The Cd2+ adsorption capacity of the whole-cell adsorbent was three-fold that of the control cells in a 20 mu M Cd2+ solution, and 97.2% +/- 2.38% of the Cd2+ was removed. The whole-cell adsorbent was fed to shrimp (Neocaridina denticulata), and the surface-engineered E. coli successfully colonized the shrimp intestine, which showed significantly less Cd accumulation than the group not fed surface-engineered E. coli. The whole-cell adsorbent evidently protected shrimp from the toxicity of Cd2+ by adsorbing it. Moreover, the whole-cell adsorbent mitigated the changes in microbial community structure in the shrimp gut caused by the exposure of Cd2+. These findings suggest that this strategy is effective for controlling the contamination of Cd2+ in shrimp.