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Applied and Environmental Microbiology, August 2001, p. 3564-3576, Vol. 67, No. 8
0099-2240/01/$04.00+0 DOI: 10.1128/AEM.67.8.3564-3576.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Sequence Analysis and Molecular
Characterization of the Lactococcus lactis Temperate
Bacteriophage BK5-T
Chitladda
Mahanivong,1
John D.
Boyce,1,
Barrie E.
Davidson,1 and
Alan J.
Hillier2,3,*
Russell Grimwade School of
Biochemistry and Molecular Biology, The University of
Melbourne, Parkville, Victoria 3010,1 and
Food Science Australia2 and
Department of Food Science and Agribusiness, The University
of Melbourne,3 Werribee, Victoria 3030, Australia
Received 8 December 2000/Accepted 20 April 2001
The Lactococcus lactis temperate bacteriophage
BK5-T is one of twelve type phages that define L. lactis phage species. This paper describes the nucleotide
sequence and analysis of a 21-kbp region of the BK5-T genome and
completes the nucleotide sequence of the genome of this phage. The
40,003-nucleotide linear genome encodes 63 open reading frames.
Sequence runoff experiments showed that the cohesive ends of the BK5-T
genome contained a 12-bp 3' single-stranded overhang with the
sequence 5'-CACACACATAGG-3'. Two major BK5-T
structural proteins, of approximately 30 and 20 kDa, were
identified, and N-terminal sequence analysis determined that they were
encoded by orf7 and orf12, respectively. A
169-bp fragment containing a 37-bp direct repeat and several smaller repeat sequences conferred resistance to BK5-T infection when introduced in trans to the host cell and is likely a part
of the BK5-T origin of replication (ori).
*
Corresponding author. Mailing address: Food Science
Australia, Private Bag 16, Werribee, Victoria 3030, Australia.
Phone: 61 3 9731 3268. Fax: 61 3 9731 3254. E-mail:
alan.hillier{at}foodscience.afisc.csiro.au.

This report is dedicated to the memory of Barrie E. Davidson, who
passed away in July
2000.

Present address: Department of Microbiology, Monash University,
Clayton, Victoria 3800,
Australia.
Applied and Environmental Microbiology, August 2001, p. 3564-3576, Vol. 67, No. 8
0099-2240/01/$04.00+0 DOI: 10.1128/AEM.67.8.3564-3576.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
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