Effects of NaCl on gene expression of agmatine deiminase pathway genes of putrescine inLactobacillus delbrueckiiandEscherichia coli

Abstract

Biogenic amines (BAs) are low-molecular-weight nitrogenous organic compounds formed by the decarboxylation of homologous amino acids. Normal metabolic activities in humans, animals, plants and microorganisms both synthesize and degrade BAs, and the amino acid decarboxylases responsible are abundant in spoilage and other food microorganisms (Alvarez & Moreno-Arribas, 2014). Putrescine, a type of BA, is not only the precursor substance of spermine and spermidine, but it can also strengthen the toxic effects of histamine and tyramine (Hernández-Orte et al., 2008), and it reacts with nitrite to generate cancerogenic nitrosamine (Shalaby, 1996). A high