Composition of archaeal, bacterial, and eukaryal RuBisCO genotypes in three Western Pacific arc hydrothermal vent systems
We studied the diversity of all forms of the RuBisCO large subunit-encoding gene cbbL in three RuBisCO uncharacterized hydrothermal vent communities. This diversity included the archaeal cbbL and the forms IC and ID, which have not previously been studied in the deep-sea environment, in addition to the forms IA, IB and II. Vent plume sites were Fryer and Pika in the Mariana arc and the Suiyo Seamount, Izu-Bonin, Japan. The cbbL forms were PCR amplified from plume bulk microbial DNA and then cloned and sequenced. Archaeal cbbL was detected in the Mariana samples only. Both forms IA and II were amplified from all samples, while the form IC was amplified only from the Pika and Suiyo samples. Only the Suiyo sample showed amplification of the form ID. The form IB was not recorded in any sample. Based on rarefaction analysis, nucleotide diversity and average pairwise difference, the archaeal cbbL was the most diverse form in Mariana samples, while the bacterial form IA was the most diverse form in the Suiyo sample. Also, the Pika sample harbored the highest diversity of cbbL phylogenetic lineages. Based on pairwise reciprocal library comparisons, the Fryer and Pika archaeal cbbL libraries showed the most significant difference, while Pika and Suiyo showed the highest similarity for forms IA and II libraries. This suggested that the Fryer supported the most divergent sequences. All archaeal cbbL sequences formed unique phylogenetic lineages within the branches of anaerobic thermophilic archaea of the genera Pyrococcus, Archaeoglobus, and Methanococcus. The other cbbL forms formed novel phylogenetic clusters distinct from any recorded previously in other deep-sea habitats. This is the first evidence for the diversity of archaeal cbbL in environmental samples.
KeywordsDeep-sea hydrothermal vents RuBisCO cbbL Archaea Bacteria Eukarya Statistical analyses Phylogenetic analyses
We deeply thank Professor Urabe, Tokyo University, for providing physicochemical data on studied vents. We thank the operations team of the DSV Shinkai 6500 and Shinkai 2000, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), for their help in the collection of samples. This work was supported by the Special Coordination Fund “Archaean Park Project: International Research Project on Interaction between Sub-vent Biosphere and Geo-environments” from the Japan Science and Technology Agency (JST); and Grants-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS).
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