Inhibitory e¡ect of L-pyroglutamate on extremophiles : correlation with growth temperature and pH

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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. 6 2003 Federation of European Microbiological Societies. Published by Elsevier Science B.V. All rights reserved.
Publisher
Elsevier
Issue Date
2003-04
Keywords

L-Pyroglutamate; Extremophile; Growth inhibition; L-Glutamate

Citation

FEMS Microbiology Letters, Vol.221, pp.187-190

ISSN
0378-1097
DOI
10.1016/S0378-1097(03)00213-1
URI
http://hdl.handle.net/10203/25496
Appears in Collection
MS-Journal Papers(저널논문)

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