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Strains of Streptococcus lactis which contain β-galactosidase

Published online by Cambridge University Press:  01 June 2009

John A. E. Farrow  and
Ellen I. Garvie
John A. E. Farrow
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, R02 9AT
Ellen I. Garvie
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, R02 9AT
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Summary

In the past the classification of ATCC 7962 as a strain of Streptococcus lactis has been questioned because it contains β-galactosidase and not β-phosphogalactosidase, and because all extracts do not react with group N antiserum. A comparison was made between ATCC 7962 and known strains of Str. lactis using physiological properties, some of the properties of the lactate dehydrogenases and percent guanine plus cytosine in the DNA. ATCC 7962 was distinguished only by its ability to ferment pentoses. The degree of hydribization between the DNA of ATCC 7962 and that of a typical strain of Str. lactis was 67 %. ATCC 7962 is an atypical strain of Str. lactis. The properties of a wild strain of Str. lactis isolated from radishes in Brunei which contains β-galactosidase and β-phosphogalactosidase, are given also. This strain ferments pentoses.

Type
Original Articles
Information
Journal of Dairy Research , Volume 46 , Issue 1 , January 1979 , pp. 121 - 125
Copyright
Copyright © Proprietors of Journal of Dairy Research 1979

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