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A predator-prey interaction between a marine Pseudoalteromonas sp. and Gram-positive bacteria.
Nature Communications ( IF 12.121 ) Pub Date : 2020-01-15 , DOI: 10.1038/s41467-019-14133-x
Bai-Lu Tang,Jie Yang,Xiu-Lan Chen,Peng Wang,Hui-Lin Zhao,Hai-Nan Su,Chun-Yang Li,Yang Yu,Shuai Zhong,Lei Wang,Ian Lidbury,Haitao Ding,Min Wang,Andrew McMinn,Xi-Ying Zhang,Yin Chen,Yu-Zhong Zhang

Predator-prey interactions play important roles in the cycling of marine organic matter. Here we show that a Gram-negative bacterium isolated from marine sediments (Pseudoalteromonas sp. strain CF6-2) can kill Gram-positive bacteria of diverse peptidoglycan (PG) chemotypes by secreting the metalloprotease pseudoalterin. Secretion of the enzyme requires a Type II secretion system. Pseudoalterin binds to the glycan strands of Gram positive bacterial PG and degrades the PG peptide chains, leading to cell death. The released nutrients, including PG-derived D-amino acids, can then be utilized by strain CF6-2 for growth. Pseudoalterin synthesis is induced by PG degradation products such as glycine and glycine-rich oligopeptides. Genes encoding putative pseudoalterin-like proteins are found in many other marine bacteria. This study reveals a new microbial interaction in the ocean.
更新日期:2020-01-15

 

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