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A small predatory core genome in the divergent marine Bacteriovorax marinus SJ and the terrestrial Bdellovibrio bacteriovorus
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A small predatory core genome in the divergent marine Bacteriovorax marinus SJ and the terrestrial Bdellovibrio bacteriovorus
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Journal Article
A small predatory core genome in the divergent marine Bacteriovorax marinus SJ and the terrestrial Bdellovibrio bacteriovorus
2013
Overview
Bacteriovorax marinus
SJ is a predatory delta-proteobacterium isolated from a marine environment. The genome sequence of this strain provides an interesting contrast to that of the terrestrial predatory bacterium
Bdellovibrio bacteriovorus
HD100. Based on their predatory lifestyle,
Bacteriovorax
were originally designated as members of the genus
Bdellovibrio
but subsequently were re-assigned to a new genus and family based on genetic and phenotypic differences.
B. marinus
attaches to Gram-negative bacteria, penetrates through the cell wall to form a bdelloplast, in which it replicates, as shown using microscopy.
Bacteriovorax
is distinct, as it shares only 30% of its gene products with its closest sequenced relatives. Remarkably, 34% of predicted genes over 500 nt in length were completely unique with no significant matches in the databases. As expected,
Bacteriovorax
shares several characteristic loci with the other delta-proteobacteria. A geneset shared between
Bacteriovorax
and
Bdellovibrio
that is not conserved among other delta-proteobacteria such as
Myxobacteria
(which destroy prey bacteria externally
via
lysis), or the non-predatory
Desulfo-bacteria
and
Geobacter
species was identified. These 291 gene orthologues common to both
Bacteriovorax
and
Bdellovibrio
may be the key indicators of host-interaction predatory-specific processes required for prey entry. The locus from
Bdellovibrio bacteriovorus
is implicated in the switch from predatory to prey/host-independent growth. Although the locus is conserved in
B. marinus
, the sequence has only limited similarity. The results of this study advance understanding of both the similarities and differences between
Bdellovibrio
and
Bacteriovorax
and confirm the distant relationship between the two and their separation into different families.
Publisher
Nature Publishing Group UK,Oxford University Press,Nature Publishing Group
Subject
/ Bacteria
/ Bacterial Proteins - genetics
/ Bacterial Proteins - metabolism
/ Bdellovibrio - classification
/ Biomedical and Life Sciences
/ Deltaproteobacteria - classification
/ Deltaproteobacteria - genetics
/ Deltaproteobacteria - physiology
/ Ecology
/ Gene Expression Regulation, Bacterial
/ Genomes
/ Microbial Genetics and Genomics
/ Original
/ Plasmids
/ Prey
