Review article

Catabolism of Amino Acids in the Cells of Lactic Acid Bacteria

Nuša Jelovac ; Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb
Anamarija Perković ; Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb
Marina Pupovac ; Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb
Antonija Trontel ; Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb
Anita Slavica orcid.org/0000-0003-3891-787X ; Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb

Abstract

Lactic acid bacteria are auxotrophic industrial microorganisms usually cultivated in complex growth media. Among other ingredients, in the media for cultivation of the bacteria, particular amino acids need to be added. Branched-chain amino acids, leucine, isoleucine and valine, have to be added in the media in which lactic acid bacteria are expected to grow. Requirement for the rest of amino acids depends on the species and strain of the bacteria that have been used in defi ned bioprocess. During transport of amino acids in the lactic acid bacteria cells and degradation of this nitrogen and carbon sources, electrochemical gradient is formed, metabolic energy is yielded, enzyme cofactors are regenerated, effect of
produced lactic acid i.e. reduction of pH value is moderated, the cells are adapted to osmotic shock as well as to stationary growth phase conditions. Amino acids and/or (intermediate) compounds generated during their catabolism represent precursors for production of: other aminoacids and fatty acids, which can be incorporated in membranes; α-keto acids and α-hydroxy acids, which can also act as siderophores; lactones; nucleic acids; lypides and polyamines. Amino acids catabolism in lactic acid bacteria cells is not known enough and it is mainly investigated in order to reduce concentration of undesired amines in fermented food.

Keywords

amino acids; lactic acid bacteria; catabolism; metabolic energy-yielding; regulation of pH value; cofactor reoxidation; osmotic shock

Hrčak ID:

70726

URI

https://hrcak.srce.hr/70726

Publication date:

30.6.2011.

Article data in other languages: croatian

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