Nucleic Acids Research, Vol 27, Issue 10 2145-2155, Copyright © 1999 by Oxford University Press
MC Smith, RN Burns, SE Wilson and MA Gregory
The completed genome sequence of the temperate Streptomyces phage straight
phiC31 is reported. straight phiC31 contains genes that are related by
sequence similarities to several other dsDNA phages infecting many diverse
bacterial hosts, including Escherichia, Arthrobacter, Mycobacterium,
Rhodobacter, Staphylococcus, Bacillus, Streptococcus, Lactobacillus and
Lactococcus. These observations provide further evidence that dsDNA phages
from diverse bacterial hosts are related and have had access to a common
genetic pool. Analysis of the late genes was particularly informative. The
sequences of the head assembly proteins (portal, head protease and major
capsid) were conserved between straight phiC31, coliphage HK97,
staphylococcal phage straight phiPVL, two Rhodobacter capsulatus prophages
and two Mycobacterium tuberculosis prophages. These phages and prophages
(where non-defective) from evolutionarily diverse hosts are, therefore,
likely to share a common head assembly mechanism i.e. that of HK97. The
organisation of the tail genes in straight phiC31 is highly reminiscent of
tail regions from other phage genomes. The unusual organisation of the
putative lysis genes in straight phiC31 is discussed, and speculations are
made as to the roles of some inessential early gene products. Similarities
between certain phage gene products and eukaryotic dsDNA virus proteins
were noted, in particular, the primase/helicases and the terminases (large
subunits). Furthermore, the complete sequence clarifies the overall
transcription map of the phage during lytic growth and the positions of
elements involved in the maintenance of lysogeny.
ARTICLES
The complete genome sequence of the Streptomyces temperate phage straight phiC31: evolutionary relationships to other viruses
Institute of Genetics, University of Nottingham, Queen's Medical Centre, Nottingham NG7 2UH, UK. maggie.smith@nottingham.ac.uk
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