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Applied and Environmental Microbiology, March 2005, p. 1655-1658, Vol. 71, No. 3
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.3.1655-1658.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Genetic Diversity in the Lactose Operons of Lactobacillus helveticus Strains and Its Relationship to the Role of These Strains as Commercial Starter Cultures

M. J. Callanan, T. P. Beresford, and R. P. Ross*

Teagasc, Dairy Products Research Centre, Moorepark, Fermoy, County Cork, Ireland

Received 19 May 2004/ Accepted 7 October 2004

ABSTRACT

Two novel insertion sequence elements, ISLhe1 and ISLhe15, were located upstream of the genes encoding the ß-galactosidase enzyme in Lactobacillus helveticus commercial starter strains. Strains with the IS982 family element, ISLhe1, demonstrated reduced ß-galactosidase activity compared to the L. helveticus type strain, whereas strains with the ISLhe15 element expressed ß-galactosidase in the absence of lactose.

* Corresponding author. Mailing address: Dairy Products Research Centre, Moorepark, Fermoy, Co. Cork, Ireland. Phone: 353 25 42229. Fax: 353 25 42340. E-mail: pross{at}moorepark.teagasc.ie.

Applied and Environmental Microbiology, March 2005, p. 1655-1658, Vol. 71, No. 3
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.3.1655-1658.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

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  • Di Cagno, R., De Angelis, M., Limitone, A., Fox, P. F., Gobbetti, M. (2006). Response of Lactobacillus helveticus PR4 to Heat Stress during Propagation in Cheese Whey with a Gradient of Decreasing Temperatures.. Appl. Environ. Microbiol. 72: 4503-4514 [Abstract] [Full Text]  
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