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  4. Acetic and citric acids effect the type II secretion system and decrease the metabolic activities of salmon spoilage-related Rahnella aquatilis KM05
 
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Acetic and citric acids effect the type II secretion system and decrease the metabolic activities of salmon spoilage-related Rahnella aquatilis KM05

Type
Journal article
Language
English
Date issued
2024
Author
Myszka, Kamila 
Wolko, Łukasz 
Borkowska, Monika 
Faculty
Wydział Nauk o Żywności i Żywieniu
Wydział Rolnictwa, Ogrodnictwa i Biotechnologii
Journal
World Journal of Microbiology and Biotechnology
ISSN
0959-3993
DOI
10.1007/s11274-024-04101-z
Web address
https://link.springer.com/article/10.1007/s11274-024-04101-z
Volume
40
Pages from-to
art. 294
Abstract (EN)
Rahnella aquatilis causes seafoods to spoil by metabolizing sulfur-containing amino acids and/or proteins, producing H2S in products. The type II secretion system (T2SS) regulates the transport of proteases from the cytoplasm to the surrounding environment and promotes bacterial growth at low temperatures. To prevent premature fish spoilage, new solutions for inhibiting the T2SS of bacteria should be researched. In this study, global transcriptome sequencing was used to analyze the spoilage properties of R. aquatilis KM05. Two of the mapped genes/coding sequences (CDSs) were matched to the T2SS, namely, qspF and gspE, and four of the genes/CDSs, namely, ftsH, rseP, ptrA and pepN, were matched to metalloproteases or peptidases in R. aquatilis KM05. Subinhibitory concentrations of citric (18 µM) and acetic (41 µM) acids caused downregulation of T2SS-related genes (range from − 1.0 to -4.5) and genes involved in the proteolytic activities of bacteria (range from − 0.5 to -4.0). The proteolytic activities of R. aquatilis KM05 in vitro were reduced by an average of 40%. The in situ experiments showed the antimicrobial properties of citric and acetic acids against R. aquatilis KM05; the addition of an acidulant to salmon fillets limited microbial growth. Citric and acetic acids extend the shelf life of fish-based products and prevent food waste.
Keywords (EN)
  • Spoilage of seafoods

  • Rahnella aquatilis

  • RNA-seq

  • Citric acid

  • Acetic acid

  • T2SS

License
cc-bycc-by CC-BY - Attribution
Open access date
August 8, 2024
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