A predator-prey interaction between a marine Pseudoalteromonas sp. and Gram-positive bacteria

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 and Yu-Zhong Zhang ()
Additional contact information
Bai-Lu Tang: Shandong University
Jie Yang: Shandong University
Xiu-Lan Chen: Shandong University
Peng Wang: Shandong University
Hui-Lin Zhao: Shandong University
Hai-Nan Su: Shandong University
Chun-Yang Li: Ocean University of China
Yang Yu: Shandong University
Shuai Zhong: Shandong University
Lei Wang: Shandong University
Ian Lidbury: University of Warwick
Haitao Ding: Polar Research Institute of China
Min Wang: Ocean University of China
Andrew McMinn: Ocean University of China
Xi-Ying Zhang: Shandong University
Yin Chen: Ocean University of China
Yu-Zhong Zhang: Shandong University

Nature Communications, 2020, vol. 11, issue 1, 1-14

Abstract: Abstract 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.

Date: 2020
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DOI: 10.1038/s41467-019-14133-x

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