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Journal of Bacteriology, March 2005, p. 2203-2208, Vol. 187, No. 6
0021-9193/05/$08.00+0 doi:10.1128/JB.187.6.2203-2208.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
Lateral Gene Transfer of Dissimilatory (Bi)Sulfite Reductase Revisited
Vladimir Zverlov,1,2
Michael Klein,1
Sebastian Lücker,3
Michael W. Friedrich,4
Josef Kellermann,5
David A. Stahl,6
Alexander Loy,3 and
Michael Wagner3*
Department of Microbiology, Technical University of Munich, Freising,1
Max-Planck-Institute for Terrestrial Microbiology, Marburg,4
Max-Planck-Institute for Biochemistry, Martinsried, Germany,5
Russian Academy of Science, Institute of Molecular Genetics, Kurchatov Square, Moscow, Russia,2
Department of Microbial Ecology, Institute of Ecology and Conservation Biology, University of Vienna, Vienna, Austria,3
Department of Civil and Environmental Engineering, University of Washington, Seattle, Washington6
Received 9 September 2004/
Accepted 24 November 2004

ABSTRACT
In contrast to previous findings, we demonstrate that the dissimilatory
(bi)sulfite reductase genes (
dsrAB) of
Desulfobacula toluolica were vertically inherited. Furthermore,
Desulfobacterium anilini and strain mXyS1 were identified, by
dsrAB sequencing of 17
reference strains, as members of the donor lineage for those
gram-positive
Desulfotomaculum species which laterally acquired
dsrAB.

TEXT
Dissimilatory (bi)sulfite reductase catalyzes the energy-generating
step during the anaerobic respiration of sulfite or sulfate
and thus represents a key enzyme of all sulfite- and sulfate-reducing
prokaryotes (
11,
22,
34). Recently, the genes encoding the alpha-
and beta-subunits of this enzyme (
dsrAB) have been used to infer
the evolutionary history of dissimilatory (bi)sulfite reductases.
For this purpose, a
dsrAB database containing 75 entries for
described sulfate-reducing prokaryotes (SRPs) (representing
all known major evolutionary lineages of this guild) and four
for sulfite-reducing microorganisms has been established (
9,
12,
14-
17,
23,
24,
28,
32,
33). Comparison of 16S rRNA- and
DsrAB-based phylogenetic trees revealed congruent topologies
for many SRP lineages, suggesting an ancient origin of dissimilatory
(bi)sulfite reductase (
33). This finding is consistent with
isotopic evidence for biological sulfate reduction at 3.47 Gyr
ago (
31). However, we now recognize that the distribution of
dsrAB among sulfate-reducing species reflects a combination
of divergence through speciation (vertical descent) and acquisition
via lateral gene transfer from distantly related prokaryotes
(
15). The archaeal SRPs of the genus
Archaeoglobus, the deep-branching
thermophilic SRPs of the genus
Thermodesulfobacterium, as well
as a large number of thermophilic gram-positive
Desulfotomaculum species, possess laterally-acquired (bi)sulfite reductases.
In addition, the deltaproteobacterial SRP
Desulfobacula toluolica was postulated to have laterally acquired its (bi)sulfite reductase
relatively recently, since its
dsrAB genes differed significantly
from those of its close relatives, including
Desulfobacter latus,
which have vertically transmitted (bi)sulfite reductase genes.
In the DsrAB tree, the putative DsrAB sequence of
D. toluolica formed a well-supported monophyletic cluster with the laterally
acquired DsrAB sequences of
Desulfotomaculum species. Therefore,
it was speculated that
D. toluolica and the
Desulfotomaculum species received their
dsrAB from a common but so far unidentified
deltaproteobacterial donor lineage (
15). However, no information
on transfer mechanism or donor lineages is available for any
of the recognized
dsrAB lateral gene transfer events.
In an attempt to determine which additional genes might have been cotransferred with the dsrAB genes of D. toluolica and to reveal genetic traces indicative of the responsible transfer mechanism, the dsr operon (and flanking regions) of this SRP was sequenced. In a first step, a digoxigenin (DIG)-labeled 152-bp polynucleotide probe targeting dsrA was generated from D. toluolica DNA by using the primers DsrA415F (5'-TATCARGATGAGCTKCATCGYCC-3') and DsrA542R(5'-ACYGCDTCCTGATCAATVCGGATAT-3') and thePCR DIG probe synthesis kit (Roche, Mannheim, Germany). Using this probe, it was demonstrated by Southern hybridization of DNA restriction fragments from D. toluolica at low stringency that this organism contains a single dsrA in its genome (data not shown). After cloning of genomic DNA of D. toluolica into a lambda vector, phages containing the dsrA gene were identified by plaque hybridization with the polynucleotide probe (29). An 8.9-kb insert of D. toluolica DNA in a phage clone which hybridized with the dsrA polynucleotide probe was sequenced by primer walking (GenBank accession no. AJ457136). Gene sequence comparison revealed that this fragment contained the dsr operon consisting of the genes dsrA, dsrB, dsrD, and dsrN (Fig. 1A). The dsrABDN operon structure of D. toluolica has previously been detected in other deltaproteobacterial SRPs (Fig. 1B). Surprisingly, comparative sequence analysis of dsrA and dsrB of D. toluolica revealed that these genes were clearly different (less than 66% nucleic acid similarity) from the dsrAB gene fragments of this organism which were previously published (15). Sequence analysis of the target sites of the PCR primers used for D. toluolica dsrAB gene fragment amplification by Klein et al. (15) revealed that dsrA has three mismatches with primer DSR1F and dsrB has one mismatch with primer DSR4R. Therefore, the dsrAB gene fragment of D. toluolica could not be amplified with these primers (data not shown). Thus, the dsrAB sequence which was previously reported (15) most likely originated from a laboratory contamination and the dsr operon sequence reported in the present paper is the actual dsr sequence of D. toluolica. The newly determined dsrAB sequence of D. toluolica phylogenetically clusters together with dsrAB sequences of the genus Desulfobacter (Fig. 2) independently from the treeing method applied (15, 19). Since this affiliation is consistent with the respective 16S rRNA gene tree topology, D. toluolica contains a vertically transmitted dsr operon. Two additional experiments were undertaken to further support this finding. First, the sequence of a 1.9-kb dsrAB PCR fragment of Desulfobacula phenolica, the closest known relative of D. toluolica, was determined and found to be almost identical (97.5% and 99.5% dsrA and dsrB nucleic acid similarity, respectively) to the respective gene sequences of D. toluolica (Fig. 2). Second, the DsrA and DsrB enzyme subunits were purified from cell extracts (7) of D. toluolica (Fig. 3) and N-terminal sequencing (6) of the DsrA subunit (N-terminal sequencing of DsrB failed) revealed 100% accordance with the respective amino acid stretch (AKHETPFL) predicted from the dsrA sequence. All predicted N-terminal amino acid sequences of DsrA from other SRPs differ in at least one amino acid from this sequence.
The sequence of
D. toluolica extends the number of available
complete
dsrAB sequences from reference cultures to 11. These
sequences can be used to validate the suitability of the commonly
used PCR primers for
dsrAB amplification from SRP pure cultures
and from environmental or clinical samples (Table
1). With the
exception of the
dsrAB of
D. toluolica and
Desulfotalea psychrophila (
28), the primers DSR1F and DSR4R (
33) and their recently published
variants (
19) perfectly match the available complete
dsrAB genes.
For improved coverage of SRPs in future experiments, it is recommended
that primer pairs DSR1Fc-DSR4Rd and DSR1Fd-DSR4Re, targeting
dsrAB of
D. toluolica and
D. psychrophila, respectively, are
added to the primer variant mixture (Table
1). Furthermore,
PCR annealing stringency should be kept low in environmental
dsrAB diversity surveys (e.g., references
1-
5,
8,
13,
20,
25,
and
26) because it is likely that additional sequence variants
in the
dsrAB PCR primer binding sites exist.
View this table:
[in this window]
[in a new window]
|
TABLE 1. DSR1F and DSR4R primer binding sites as recognized from completely sequenced dsrAB genes of SRPs and B. wadsworthia
|
In the DsrAB tree, none of the SRPs which received the genes
for this enzyme by lateral transfer group with species possessing
vertically transmitted enzyme genes. This suggests that the
dsrAB donor lineages have yet to be described or, alternatively,
are no longer extant. In order to more fully describe the evolutionary
history of the dissimilatory (bi)sulfite reductase, PCR-amplified
dsrAB gene fragments (
19,
33) of 15 SRPs and the syntrophic
gram-positive bacterium
Sporotomaculum hydroxybenzoicum were
cloned, sequenced, and phylogenetically analyzed (Fig.
2). The
identity of the analyzed reference cultures was confirmed by
comparative 16S rRNA gene sequence analysis (
27).
Interestingly, the DsrAB sequences of the deltaproteobacterial SRPs Desulfobacterium anilini (30) and strain mXyS1 (10) formed a well-supported monophyletic branch with the laterally acquired sulfite reductases of the gram-positive Desulfotomaculum species (Fig. 2). This affiliation, which is consistently inferred by different treeing methods, suggests that D. anilini and strain mXyS1 either acquired their (bi)sulfite reductase genes from the same unknown donor lineage as the gram-positive SRPs or that these two organisms are members of the dsrAB lineage, which served as donor for the gram-positive SRPs. Since D. anilini and strain mXyS1, which are marine mesophilic bacteria, form an independent lineage within the "Deltaproteobacteria" in the 16S rRNA and DsrAB trees (with the exception of the gram-positive bacteria with the laterally acquired dsrAB) (Fig. 2), this lineage is the most parsimonious dsrAB donor candidate for the gram-positive SRPs.
As S. hydroxybenzoicum forms a monophyletic branch in the 16S rRNA tree together with Desulfotomaculum species known to have received deltaproteobacterial dsrAB, it was not unexpected that S. hydroxybenzoicum also contains laterally acquired dsrAB. Similarly, Archaeoglobus veneficus possesses, like the other two species of this genus, laterally transferred dsrAB. The phylogenetic affiliations of the 12 remaining novel dsrAB sequences were found to be largely congruent with the respective 16S rRNA phylogeny of the organisms (Fig. 2). This observation further supports our current perception that the dissimilatory (bi)sulfite reductase is an ancient enzyme whose evolutionary history is largely consistent with vertical transmission but has also been influenced by periodic lateral gene transfer events. To avoid publication of incorrectly assigned dsrAB sequences in the future, we recommend careful checking of the purity of reference cultures. Furthermore, PCR-independent control experiments (e.g., Southern hybridization with genomic DNA using a dsrAB-targeted highly specific oligonucleotide probe) should be implemented for those reference cultures whose DsrAB sequences do not phylogenetically cluster with DsrAB sequences of recognized close relatives (as inferred from phylogenetic 16S rRNA trees).

ACKNOWLEDGMENTS
We thank Natuschka Lee for database maintenance, Gerda Harms
for valuable discussion, and Michael Taylor for critical review
of the manuscript. Christian Baranyi, Stephan Duller, and Sibylle
Schadhauser are acknowledged for their excellent technical assistance.
This research was supported by grants of the bmb+f (01 LC 0021 subproject 2 in the framework of the BIOLOG program) and of the DFG (in the framework of the project "Degradation of marine pollutants by cyanobacterial matsan interdisciplinary approach") to M.W. and by a Marie Curie Intra-European Fellowship (VENTSULFURMICDIV) within the 6th European Community Framework Programme to A.L. D.A.S. was supported by grant DEB-0213186 from the U.S. National Science Foundation.

FOOTNOTES
* Corresponding author. Mailing address: Department für Mikrobielle Ökologie, Institut für Ökologie und Naturschutz, Universität Wien, Althanstr. 14, A-1090 Vienna, Austria. Phone: 43 1 4277 54390. Fax: 43 1 4277 54389. E-mail:
wagner{at}microbial-ecology.net.


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Journal of Bacteriology, March 2005, p. 2203-2208, Vol. 187, No. 6
0021-9193/05/$08.00+0 doi:10.1128/JB.187.6.2203-2208.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
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