title: Analysis of dissimilatory sulfite reductase and 16S rRNA gene fragments from deep-sea hydrothermal sites of the Suiyo Seamount, Izu-Bonin Arc, Western Pacific.
abstract: This study describes the occurrence of unique dissimilatory sulfite reductase (DSR) genes at a depth of 1,380 m from the deep-sea hydrothermal vent field at the Suiyo Seamount, Izu-Bonin Arc, Western Pacific, Japan. The DSR genes were obtained from microbes that grew in a catheter-type in situ growth chamber deployed for 3 days on a vent and from the effluent water of drilled holes at 5 degrees C and natural vent fluids at 7 degrees C. DSR clones SUIYOdsr-A and SUIYOdsr-B were not closely related to cultivated species or environmental clones. Moreover, samples of microbial communities were examined by PCR-denaturing gradient gel electrophoresis (DGGE) analysis of the 16S rRNA gene. The sequence analysis of 16S rRNA gene fragments obtained from the vent catheter after a 3-day incubation revealed the occurrence of bacterial DGGE bands affiliated with the Aquificae and gamma- and epsilon-Proteobacteria as well as the occurrence of archaeal phylotypes affiliated with the Thermococcales and of a unique archaeon sequence that clustered with "Nanoarchaeota." The DGGE bands obtained from drilled holes and natural vent fluids from 7 to 300 degrees C were affiliated with the delta-Proteobacteria, genus Thiomicrospira, and Pelodictyon. The dominant DGGE bands retrieved from the effluent water of casing pipes at 3 and 4 degrees C were closely related to phylotypes obtained from the Arctic Ocean. Our results suggest the presence of microorganisms corresponding to a unique DSR lineage not detected previously from other geothermal environments.
authors.affiliation: Department of Biological Science, Graduate School of Science, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan.
authors.forename: Tatsunori
authors.initials: T
authors.lastname: Nakagawa
authors.forename: Jun-Ichiro
authors.initials: J
authors.lastname: Ishibashi
authors.forename: Akihiko
authors.initials: A
authors.lastname: Maruyama
authors.forename: Toshiro
authors.initials: T
authors.lastname: Yamanaka
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Morimoto
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kimura
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Urabe
authors.forename: Manabu
authors.initials: M
authors.lastname: Fukui
mesh_terms: D000595:Amino Acid Sequence; D001105:Archaea / Q000145:classification / Q000201:enzymology / Q000235:genetics* / Q000302:isolation & purification; D001483:Base Sequence; D019641:DNA, Archaeal / Q000032:analysis; D004269:DNA, Bacterial / Q000032:analysis; D004275:DNA, Ribosomal / Q000032:analysis; D004586:Electrophoresis / Q000379:methods; D020459:Genes, rRNA; D006358:Hot Temperature; D008969:Molecular Sequence Data; D050862:Oxidoreductases Acting on Sulfur Group Donors / Q000737:chemistry / Q000235:genetics*; D010140:Pacific Ocean; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D020560:Proteobacteria / Q000145:classification / Q000201:enzymology / Q000235:genetics* / Q000302:isolation & purification; D012336:RNA, Ribosomal, 16S / Q000235:genetics*; D012623:Seawater / Q000382:microbiology*; D017422:Sequence Analysis, DNA; D019709:Thermococcales / Q000145:classification / Q000201:enzymology / Q000235:genetics
chemical_list: D019641:DNA, Archaeal; D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D012336:RNA, Ribosomal, 16S; D050862:Oxidoreductases Acting on Sulfur Group Donors