Inhibitory effect of L-pyroglutamate on extremophiles: correlation with growth temperature and pH

L-Pyroglutamate (PGA) is naturally occurring from L-glutamate solution with accelerated formation rate under high temperature and low pH. Even though PGA has been identified as a neurotoxic agent on brain cells, the effect of PGA on the growth of microorganisms is rarely known. Here various kinds of...

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Bibliographic Details
Published inFEMS microbiology letters Vol. 221; no. 2; pp. 187 - 190
Main Authors Park, Chan Beum, Ryu, Dewey D.Y, Lee, Sun Bok
Format Journal Article
LanguageEnglish
Published Oxford, UK Elsevier B.V 25.04.2003
Blackwell Publishing Ltd
Blackwell
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Summary:L-Pyroglutamate (PGA) is naturally occurring from L-glutamate solution with accelerated formation rate under high temperature and low pH. Even though PGA has been identified as a neurotoxic agent on brain cells, the effect of PGA on the growth of microorganisms is rarely known. Here various kinds of microorganisms differing in their optimal growth temperature, pH, phylogeny, and isolated biotope were investigated for the effect of PGA. We found that growth of thermoacidophiles, including both archaea and bacteria, was seriously inhibited by the presence of PGA, and the extent of the inhibitory effect was closely related with growth temperature and pH. Interestingly, only microbes that grow at high temperature and low pH are inhibited by PGA, while this compound may stimulate growth rates of organisms that live at neutral pH and low temperature.
Bibliography:Department of Chemical and Materials Engineering, Arizona State University, Tempe, AZ 85287, USA.
ObjectType-Article-2
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ISSN:0378-1097
1574-6968
DOI:10.1016/S0378-1097(03)00213-1