Identity of Major Sulfur-cycle Prokaryotes in Freshwater Lake Ecosystems Revealed by a Comprehensive Phylogenetic Study of the Dissimilatory Adenylylsulfate Reductase

Overview

Journal Sci Rep

Specialty Science

Date 2016 Nov 9

PMID 27824124

Citations 12

Authors

Tomohiro Watanabe

Hisaya Kojima

Manabu Fukui

Affiliations

Soon will be listed here.

Abstract

Adenylylsulfate reductase is a heterodimeric complex of two subunits, AprB and AprA, and is a key enzyme in dissimilatory sulfate reduction and sulfur oxidation. Common use of aprA as a functional marker gene has revealed the diversity of sulfur-cycle prokaryotes in diverse environments. In this study, we established a comprehensive sequence set of apr genes and employed it to reanalyze apr phylogeny, evaluate the coverage of a widely used primer set (AprA-1-FW/AprA-5-RV), and categorize environmental aprA sequences. Phylogenetic tree construction revealed new members of Apr lineage II and several previously unrecognized lateral gene transfer events. Using the established phylogenetic tree, we classified all previously reported aprA sequences amplified from freshwater lakes with the primer pair AprA-1-FW/AprA-5-RV in addition to the aprA sequences newly retrieved from freshwater lakes; the obtained results were complemented by 16S rRNA clone library analysis. Apr-based classifications of some of operational taxonomic units were supported by 16S rRNA-based analysis. This study updates our knowledge on the phylogeny of aprBA and shows the identities of several sulfur-cycle bacteria, which could not be classified to a known taxa until now. The established apr sequence set is publicly available and can be applied to assign environmental sequences to known lineages.

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