Molecular and General Genetics MGG

, Volume 235, Issue 2–3, pp 359–364 | Cite as

Isolation of purine auxotrophic mutants of Lactococcus lactis and characterization of the gene hpt encoding hypoxanthine guanine phosphoribosyltransferase

  • Dan Nilsson
  • Anette Ager Lauridsen
Original Articles


Five purine auxotrophic mutants of Lactococcus lactis were isolated. L. lactis was capable of converting adenine, guanine and hypoxanthine to AMP, GMP and IMP, respectively, indicating the existence of adenine phosphoribosyltransferase (APRT) and hypoxanthine guanine phosphoribosyltransferase (HGPRT) activities. A 1.3 kb DNA fragment from L. lactis was cloned by complementation of the hpt mutation in Escherichia coli. Introduction of this fragment into L. lactis resulted in an increase in HGPRT activity. In vitro transcription and translation analysis showed that the fragment coded for a polypeptide with Mr of 22000. The nucleotide sequence of this hpt gene was determined.

Key words

Purine salvage pathways Lactococcus lactis hpt Nucleotide sequence Hypoxanthine guanine phosphoriboxyl transferase (HGPRT) 


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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Dan Nilsson
    • 1
  • Anette Ager Lauridsen
    • 1
  1. 1.Department of GeneticsChr. Hansen's Laboratorium Denmark A/SHørsholmDenmark

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