Thermodesulfovibrio autotrophicus sp. nov., the first autotrophic representative of the widespread sulfate-reducing genus Thermodesulfovibrio, and Thermodesulfovibrio obliviosus sp. nov. that has lost this ability

IF 3.3 2区 生物学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Anastasia I. Maltseva , Alexander G. Elcheninov , Alexandra A. Klyukina , Nikolay V. Pimenov , Andrei A. Novikov , Alexander V. Lebedinsky , Evgenii N. Frolov
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引用次数: 0

Abstract

Representatives of the genus Thermodesulfovibrio are widespread thermophilic sulfate-reducing bacteria. The genus currently includes five species with validly published names. Two new Thermodesulfovibrio strains, 3907-1M T and 3462-1T, were isolated with molecular hydrogen as an electron donor, sulfate as an electron acceptor and acetate as the carbon source from hot springs of Kunashir Island and Kamchatka Peninsula. Similar to other Thermodesulfovibrio species, the new isolates grew by reduction of sulfate, thiosulfate or Fe (III) with a limited range of electron donors, such as hydrogen (in the presence of acetate), formate (in the presence of acetate), pyruvate and lactate. Surprisingly, strain 3907-1MT proved to be capable of autotrophic growth as well. Up to now, the genus Thermodesulfovibrio was represented by heterotrophic species only. Genome analysis revealed the presence of a gene cluster encoding enzymes of form III RubisCO-mediated transaldolase variant of the Calvin cycle in both strains, but genes encoding ribulose-1,5-bisphosphate carboxylase and phosphoribulokinase in the genome of the strain 3462-1T contained internal stop codons in their sequences. On the basis of phylogenomic analysis, as well as distinct phenotypic and genomic properties, strain 3907-1MT (=DSM 112797T =JCM 39445T =VKM B-3594T =UQM 41601T) is proposed to be classified as Thermodesulfovibrio autotrophicus sp. nov., and strain 3462-1T (=JCM 39444T =VKM B-3714T =UQM 41602T) – as Thermodesulfovibrio obliviosus sp. nov. Our results demonstrate a chemolithoautotrophic lifestyle in Thermodesulfovibrio representatives, suggesting greater ecological flexibility of this genus than previously assumed.
自养型热去硫弧菌新种(Thermodesulfovibrio autotrophicus sp.nov.)是广泛存在的硫酸盐还原型热去硫弧菌属的第一个自养型代表,而遗忘型热去硫弧菌新种(Thermodesulfovibrio obliviosus sp.nov.)则丧失了这种能力。
嗜热硫酸还原菌属的代表是广泛存在的嗜热硫酸还原菌。该属目前包括五个已公布有效名称的物种。从库纳希尔岛和堪察加半岛的温泉中分离出了两株以分子氢为电子供体、以硫酸盐为电子受体、以醋酸盐为碳源的新热解硫弧菌菌株 3907-1M T 和 3462-1T。与其他热硫化弧菌相似,新分离菌株的生长也是通过还原硫酸盐、硫代硫酸盐或铁(III)与有限范围的电子供体,如氢(在醋酸盐存在的情况下)、甲酸盐(在醋酸盐存在的情况下)、丙酮酸盐和乳酸盐。令人惊讶的是,菌株 3907-1MT 还能自养生长。到目前为止,Thermodesulfovibrio 属只有异养物种。基因组分析表明,两株菌株中都存在编码卡尔文循环中形式 III RubisCO 介导的反醛酸酶变体的基因簇,但 3462-1T 菌株基因组中编码核酮糖-1,5-二磷酸羧化酶和磷酸核糖激酶的基因序列中含有内部终止密码子。根据系统发生组分析以及不同的表型和基因组特性,建议将菌株 3907-1MT (=DSM 112797T =JCM 39445T =VKM B-3594T =UQM 41601T)归类为自养型热硫弧菌(Thermodesulfovibrio autotrophicus sp、和菌株 3462-1T(=JCM 39444T =VKM B-3714T =UQM 41602T)--归类为新产热硫弧菌(Thermodesulfovibrio obliviosus sp.我们的研究结果表明,Thermodesulfovibrio 代表了一种化学溶解自养型的生活方式,这表明该属的生态灵活性比以前假设的要大。
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来源期刊
Systematic and applied microbiology
Systematic and applied microbiology 生物-生物工程与应用微生物
CiteScore
7.50
自引率
5.90%
发文量
57
审稿时长
22 days
期刊介绍: Systematic and Applied Microbiology deals with various aspects of microbial diversity and systematics of prokaryotes. It focuses on Bacteria and Archaea; eukaryotic microorganisms will only be considered in rare cases. The journal perceives a broad understanding of microbial diversity and encourages the submission of manuscripts from the following branches of microbiology:
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