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      Draft Genome Sequence of a Heterotrophic Facultative Anaerobic Thermophilic Bacterium, Ardenticatena maritima Strain 110S T

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          Abstract

          Ardenticatena maritima strain 110S T is a filamentous bacterium isolated from an iron-rich coastal hydrothermal field, and it is a unique isolate capable of dissimilatory iron or nitrate reduction among the members of the bacterial phylum Chloroflexi. Here, we report the draft genome sequence comprising 3,569,367 bp, containing 3,355 predicted coding sequences (CDSs).

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          Membrane protein architects: the role of the BAM complex in outer membrane protein assembly.

          The folding of transmembrane proteins into the outer membrane presents formidable challenges to Gram-negative bacteria. These proteins must migrate from the cytoplasm, through the inner membrane and into the periplasm, before being recognized by the beta-barrel assembly machinery, which mediates efficient insertion of folded beta-barrels into the outer membrane. Recent discoveries of component structures and accessory interactions of this complex are yielding insights into how cells fold membrane proteins. Here, we discuss how these structures illuminate the mechanisms responsible for the biogenesis of outer membrane proteins.
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            Ardenticatena maritima gen. nov., sp. nov., a ferric iron- and nitrate-reducing bacterium of the phylum 'Chloroflexi' isolated from an iron-rich coastal hydrothermal field, and description of Ardenticatenia classis nov.

            A novel thermophilic, chemoheterotrophic, Gram-negative-staining, multicellular filamentous bacterium, designated strain 110S(T), was isolated from an iron-rich coastal hydrothermal field in Japan. The isolate is facultatively aerobic and chemoheterotrophic. Phylogenetic analysis using 16S rRNA gene sequences nested strain 110S(T) in a novel class-level clone cluster of the phylum 'Chloroflexi'. The isolate grows by dissimilatory iron- and nitrate-reduction under anaerobic conditions, which is the first report of these abilities in the phylum 'Chloroflexi'. The organism is capable of growth with oxygen, ferric iron and nitrate as a possible electron acceptor, has a wide range of growth temperatures, and tolerates higher NaCl concentrations for growth compared to the other isolates in the phylum. Using phenotypic and phylogenetic data, strain 110S(T) (= JCM 17282(T) = NBRC 107679(T) = DSM 23922(T) = KCTC 23289(T) = ATCC BAA-2145(T)) is proposed as the type strain of a novel species in a new genus, Ardenticatena maritima gen. nov., sp. nov. In addition, as strain 110S(T) apparently constitutes a new class of the phylum 'Chloroflexi' with other related uncultivated clone sequences, we propose Ardenticatenia classis nov. and the subordinate taxa Ardenticatenales ord. nov. and Ardenticatenaceae fam. nov.
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              Cell envelope architecture in the Chloroflexi: a shifting frontline in a phylogenetic turf war.

              It is important that attempts to understand bacterial phylogeny take into account fundamental bacterial characteristics such as cell envelope composition and organization. Several prominent phylogenetic studies have assumed that the cell envelopes of members of the phylum Chloroflexi are 'gram-negative' (diderm, i.e. defined by both an inner plasma membrane and an outer membrane) and some of these studies have placed the branch leading to the extant Chloroflexi near the root of the bacterial phylogenetic tree. This Correspondence summarizes the compelling evidence that the Chloroflexi are in fact monoderm, i.e. have only a single cellular membrane. The phylogenetic implications of this conclusion are discussed. The data reviewed also shed interesting light on the distribution of protein secretion systems in diderm bacteria.
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                Author and article information

                Journal
                Genome Announc
                Genome Announc
                ga
                ga
                GA
                Genome Announcements
                American Society for Microbiology (1752 N St., N.W., Washington, DC )
                2169-8287
                1 October 2015
                Sep-Oct 2015
                : 3
                : 5
                : e01145-15
                Affiliations
                [a ]Center for Sustainable Resource Science, Biofunctional Catalyst Research Team, RIKEN, Wako, Saitama, Japan
                [b ]Laboratory of Marine Microbiology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
                Author notes
                Address correspondence to Satoshi Kawaichi, satoshi.kawaichi@ 123456riken.jp , or Yoshihiko Sako, sako@ 123456kais.kyoto-u.ac.jp .
                Article
                genomeA01145-15
                10.1128/genomeA.01145-15
                4591325
                26430053
                c922cea7-fc95-4974-b811-2884970e1670
                Copyright © 2015 Kawaichi et al.

                This is an open-access article distributed under the terms of the Creative Commons Attribution 3.0 Unported license.

                History
                : 18 August 2015
                : 19 August 2015
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 9, Pages: 2, Words: 1075
                Categories
                Prokaryotes
                Custom metadata
                September/October 2015
                free

                Genetics
                Genetics

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