Strain MG, isolated from an acidic pond sediment on the island of Milos (Greece), is proposed as a novel species of ferrous iron- and sulfur-oxidizing Acidithiobacillus. Currently, four of the eight validated species of this genus oxidize ferrous iron, and strain MG shares many key characteristics with these four, including the capacities for catalyzing the oxidative dissolution of pyrite and for anaerobic growth via ferric iron respiration. Strain MG also grows aerobically on hydrogen and anaerobically on hydrogen coupled to ferric iron reduction. While the 16S rRNA genes of the iron-oxidizing Acidi-thiobacillus species (and strain MG) are located in a distinct phylogenetic clade and are closely related (98–99% 16S rRNA gene identity), genomic relatedness indexes (ANI/dDDH) revealed strong genomic divergence between strain MG and all sequenced type strains of the taxon, and placed MG as the first cultured representative of an ancestral phylotype of iron oxidizing acidithiobacilli. Strain MG is proposed as a novel species, Acidithiobacillus ferrianus sp. nov. The type strain is MG^T (= DSM 107098^T = JCM 33084^T). Similar strains have been found as isolates or indicated by cloned 16S rRNA genes from several mineral sulfide mine sites.

中文翻译：

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Ferrianus嗜酸硫杆菌 十一月：祖先极嗜酸性和兼性厌氧的化学自养生物

MG菌株是从米洛斯岛（希腊）的酸性池塘沉积物中分离出来的，被认为是亚铁氧化硫和硫氧化的酸性硫杆菌的新种。目前，该属的八种经过验证的物种中的四种会氧化亚铁，而MG菌株与这四种具有许多关键特征，包括催化黄铁矿氧化溶解的能力以及通过三价铁呼吸产生厌氧性生长的能力。MG菌株在氢上还需氧生长，在与三价铁还原反应结合的氢上需氧厌氧生长。而铁氧化的酸性硫杆菌的16S rRNA基因物种（和MG菌株）位于不同的系统发育进化枝中，并且密切相关（98-99％的16S rRNA基因同一性），基因组相关性指数（ANI / dDDH）显示MG菌株与该菌株的所有测序类型菌株之间存在强烈的基因组差异。分类单位，并将MG作为铁氧化酸性硫杆菌的祖先系统型的第一个培养代表。MG菌株被提议为新物种，嗜酸酸性硫杆菌。十一月 类型应变为MG ^T（= DSM 107098 ^T  = JCM 33084 ^T）。已经发现相似的菌株是分离株，或者由来自几个矿物硫化物矿点的克隆的16S rRNA基因指示。