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Applied and Environmental Microbiology, March 1999, p. 1127-1132, Vol. 65, No. 3
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Diversity of Dissimilatory Bisulfite Reductase
Genes of Bacteria Associated with the Deep-Sea Hydrothermal Vent
Polychaete Annelid Alvinella pompejana
Matthew T.
Cottrell and
S. Craig
Cary*
College of Marine Studies, University of
Delaware, Lewes, Delaware 19958
Received 29 September 1998/Accepted 23 December 1998
A unique community of bacteria colonizes the dorsal integument of
the polychaete annelid Alvinella pompejana, which inhabits the high-temperature environments of active deep-sea hydrothermal vents
along the East Pacific Rise. The composition of this bacterial community was characterized in previous studies by using a 16S rRNA
gene clone library and in situ hybridization with oligonucleotide probes. In the present study, a pair of PCR primers (P94-F and P93-R)
were used to amplify a segment of the dissimilatory bisulfite reductase
gene from DNA isolated from the community of bacteria associated with
A. pompejana. The goal was to assess the presence and
diversity of bacteria with the capacity to use sulfate as a terminal
electron acceptor. A clone library of bisulfite reductase gene PCR
products was constructed and characterized by restriction fragment and
sequence analysis. Eleven clone families were identified. Two of the 11 clone families, SR1 and SR6, contained 82% of the clones. DNA sequence
analysis of a clone from each family indicated that they are
dissimilatory bisulfite reductase genes most similar to the
dissimilatory bisulfite reductase genes of Desulfovibrio vulgaris, Desulfovibrio gigas, Desulfobacterium
autotrophicum, and Desulfobacter latus. Similarities
to the dissimilatory bisulfite reductases of
Thermodesulfovibrio yellowstonii, the sulfide oxidizer Chromatium vinosum, the sulfur reducer
Pyrobaculum islandicum, and the archaeal sulfate reducer
Archaeoglobus fulgidus were lower. Phylogenetic analysis
separated the clone families into groups that probably represent two
genera of previously uncharacterized sulfate-reducing bacteria. The
presence of dissimilatory bisulfite reductase genes is consistent
with recent temperature and chemical measurements that documented
a lack of dissolved oxygen in dwelling tubes of the worm. The diversity
of dissimilatory bisulfite reductase genes in the bacterial community
on the back of the worm suggests a prominent role for anaerobic
sulfate-reducing bacteria in the ecology of A. pompejana.
*
Corresponding author. Mailing address: College of
Marine Studies, University of Delaware, Lewes, DE 19958. Phone: (302)
645-4078. Fax: (302) 645-4007. E-mail: caryc{at}udel.edu.
Applied and Environmental Microbiology, March 1999, p. 1127-1132, Vol. 65, No. 3
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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