Importance of Individual Germination Receptor Subunits in the Cooperative Function between GerA and Ynd

Author:

Aspholm Marina1,Borch-Pedersen Kristina1,O’Sullivan Kristin1,Fjellheim Siri2,Aardal Inger-Helene Bjørnson1,Granum Per Einar1,Lindbäck Toril1

Affiliation:

1. Department of Food Safety and Infection Biology, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Oslo, Norway

2. Department of Plant Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Ås, Norway

Abstract

Spore-forming bacteria are problematic for the food industry, as spores can survive decontamination procedures and subsequently revive in food products, with the risk of food spoilage and foodborne disease. The Ynd and GerA germination receptors (GRs) cooperate in triggering efficient germination of Bacillus licheniformis spores when nutrients are present in the surrounding environment. This study shows that the single B subunit of GerA is essential for the cooperative function between Ynd and GerA, while the three B subunits of the Ynd GR are dispensable. The ability of GRs lacking individual subunits to stimulate germination together with other GRs could explain why ger operons lacking GR subunit genes are maintained in genomes of spore-forming species.

Publisher

American Society for Microbiology

Subject

Molecular Biology,Microbiology

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