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Moorella humiferrea sp. nov., a thermophilic, anaerobic bacterium capable of growth via electron shuttling between humic acid and Fe(III).

Abstract：

:An anaerobic, thermophilic, spore-forming bacterium (strain 64-FGQ(T)) was isolated from a terrestrial hydrothermal spring from the Kamchatka peninsula, Russia. This strain utilized lactate as an electron donor, insoluble poorly crystalline Fe(III) oxide incorporated into alginate beads as a potential electron acceptor and 9,10-anthraquinone-2,6-disulfonate (AQDS) as an electron-shuttling compound. Vegetative cells of strain 64-FGQ(T) were Gram-stain-positive, peritrichously flagellated, motile, straight rods, 0.3-0.5 µm in diameter and 2.0-5.0 µm long, growing singly or forming short chains. Cells formed round refractive endospores in terminal swollen sporangia. The temperature range for growth was 46-70 °C, with an optimum at 65 °C. The pH range for growth was 5.5-8.5, with an optimum at pH 7.0. The substrates utilized by strain 64-FGQ(T) in the presence of AQDS as an electron acceptor included lactate, malate, succinate, glycerol and yeast extract. The strain fermented galactose, fructose, maltose, sucrose, pyruvate and peptone. Strain 64-FGQ(T) used AQDS, humic acid, thiosulfate, nitrate and perchlorate as electron acceptors for growth. Fe(III) was not directly reduced, but strain 64-FGQ(T) was able to grow and reduce Fe(III) oxide in the presence of small amounts of AQDS or humic acid as electron-shuttling compounds. The G+C content of the DNA of strain 64-FGQ(T) was 51 mol%. 16S rRNA gene sequence analysis placed the isolate in the genus Moorella, with the type strain of Moorella glycerini as its closest relative (97.2% similarity). Based on phylogenetic analysis and physiological characteristics, strain 64-FGQ(T) is considered to represent a novel species of the genus Moorella, for which the name Moorella humiferrea sp. nov. is proposed; the type strain is 64-FGQ(T) (=DSM 23265(T)=VKM B-2603(T)).

journal_name

Int J Syst Evol Microbiol

journal_title

International journal of systematic and evolutionary microbiology

authors

Nepomnyashchaya YN,Slobodkina GB,Baslerov RV,Chernyh NA,Bonch-Osmolovskaya EA,Netrusov AI,Slobodkin AI

doi

10.1099/ijs.0.029009-0

subject

Has Abstract

pub_date

2012-03-01 00:00:00

pages

613-617

issue

Pt 3

eissn

1466-5026

issn

1466-5034

journal_volume

pub_type

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Moorella humiferrea sp. nov., a thermophilic, anaerobic bacterium capable of growth via electron shuttling between humic acid and Fe(III).