Sigma factor RpoS positively affects the spoilage activity of Shewanella baltica and negatively regulates its adhesion effect.

ABSTRACT: Shewanella baltica is the dominant bacterium that causes spoilage of seafood. RpoS is an alternative sigma factor regulating stress adaptation in many bacteria. However, the detailed regulatory mechanism of RpoS in S. baltica remains unclear. This study aims to investigate the regulatory function of RpoS on spoilage activity and adhesion ability in S. baltica. Results revealed that RpoS had no effect on the growth of S. baltica, but positively regulated the spoilage potential of S. baltica accompanied by a slower decline of total volatile basic nitrogen, lightness, and the sensory score of fish fillets inoculated with rpoS mutant. RpoS negatively regulated the adhesion ability, which was manifested in that the bacterial number of rpoS mutant

SUBMITTER: Zhang C 

PROVIDER: S-EPMC9478337 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature