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首页> 外文期刊>Microbiology >Natronincola ferrireducens sp nov., and Natronincola peptidovorans sp nov., new anaerobic alkaliphilic peptolytic iron-reducing bacteria isolated from soda lakes
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Natronincola ferrireducens sp nov., and Natronincola peptidovorans sp nov., new anaerobic alkaliphilic peptolytic iron-reducing bacteria isolated from soda lakes

机译：Natronincola ferrireducens sp nov。和Natronincola peptidovorans sp nov。，从苏打湖中分离出的新型厌氧亲溶肽分解铁的细菌

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摘要

Two novel strains of obligately alkaliphilic (pH 7.5-10.2, optimum pH 8.4-8.8) anaerobic spore-forming rod-shaped bacteria, Z-0511 and Z-7031, were isolated from enrichment cultures obtained from the iron-reducing (Lake Khadyn, Tyva) and cellulolytic (Lake Verkhnee Beloe, Buryatia) bacterial communities, respectively. The organisms ferment peptides and do not ferment proteins and amino acids, with the exception of histidine and glutamate utilized by strain Z-0511. The major fermentation products were acetate and propionate for strain Z-0511 and formate and acetate for strain Z-7031, respectively. Carbohydrates and fermentable organic acids could not serve as substrates, except for pyruvate in the case of strain Z-7031. Nitrogen and sulfur compounds were not utilized as electron acceptors by the strains grown on medium with yeast extract. Strain Z-0511 utilized fumarate, crotonate, and EDTA-Fe(III) as electron acceptors. Anthraquinone-2,6-disulfonate (quinone) and Mn(IV) were utilized by both strains, as well as amorphous ferric hydroxide (AFH), which was reduced to iron sesquioxides and magnetite. The presence of AFH stimulated growth; it enhanced the yield of the fermentation products and changed the quantitative ratios of these products. According to a phylogenetic analysis of the 16S rRNA gene sequences and the phenotypic characteristics of the new strains, they were classified as new species of the genus Natronincola, Natronincola ferrireducens sp. nov. Z-0511(T) (= VKM B-2402, = DSM 18346) and Natronincola peptidovorans sp. nov. Z-7031(T) (= VKM B-2503, = DSM 18979).
机译：从还原铁的富集培养物中分离出两种新的专性嗜碱（pH 7.5-10.2，最适pH 8.4-8.8）厌氧孢子形成杆状细菌Z-0511和Z-7031。 Tyva）和纤维素酶（布里亚特共和国Verkhnee Beloe湖）细菌群落。除菌株Z-0511使用的组氨酸和谷氨酸盐外，该生物体发酵肽而不发酵蛋白质和氨基酸。 Z-0511菌株的主要发酵产物是乙酸盐和丙酸盐，Z-7031菌株的主要发酵产物是甲酸和乙酸盐。碳水化合物和可发酵有机酸不能用作底物，在菌株Z-7031的情况下，除了丙酮酸盐。在带有酵母提取物的培养基上生长的菌株没有将氮和硫的化合物用作电子受体。 Z-0511菌株利用富马酸酯，巴豆酸酯和EDTA-Fe（III）作为电子受体。两种菌株均使用蒽醌-2,6-二磺酸盐（醌）和Mn（IV），以及非晶态氢氧化铁（AFH），后者被还原为三氧化二铁和磁铁矿。 AFH的存在刺激生长;它提高了发酵产品的产量，并改变了这些产品的定量比例。根据16S rRNA基因序列的系统发育分析和新菌株的表型特征，将它们分类为Natronincola ferrireducens sp。的新种。十一月Z-0511（T）（= VKM B-2402，= DSM 18346）和Natronincola peptidovorans sp。十一月Z-7031（T）（= VKM B-2503，= DSM 18979）。

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