20 - PROKARYOTIC DIVERSITY BIOL 4125 SPRING 2009 LECTURE 20...

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PROKARYOTIC DIVERSITY BIOL 4125 SPRING 2009 LECTURE 20 Deep-branching Bacteria Part II
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The Aquificales are a group of thermophilic, chemolithotrophic and microaerophilic bacteria that are widespread in hydrothermal systems Reysenbach et al. (1994) Appl. Environ. Microbiol. 60:2113-2119; http://www.mbio.ncsu.edu/MB451 Aquifex pyrophilus is the “type strain”; a filamentous bacterium isolated from submarine hot sandy sediment at 106 m depth, Kolbeinsey Ridge north of Iceland. • Thermophilic, growing optimally at 85 o C, up to 95 o C; the most thermophilic bacterium in cultivation. • Microaerophilic - oxidizes H 2 , H 2 S, or S 2 O 3 2- with O 2 or NO 3 2- . • Based on 16S rRNA, they are the most deep branching lineage with the bacterial domain, but this placement remains controversial. • Most thermophiles are either anaerobes or microaerophiles - perhaps because the solubility of oxygen in water is very low at high temperatures. • Most are obligate chemoautotrophs and cannot grow heterotrophically; fix CO 2 via the reverse (reductive) TCA cycle. A few can also use acetate and formate as a C-source.
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Ferrera et al. (2007) Extremophiles 11:57-64 Aquifex , Thermocrinis , and relatives • About 12 characterized genera in this group, but most are represented by only one or a few species. • Members of this group have been isolated from shallow marine and deep sea vents and from terrestrial hot springs. • All are very similar physiologically, and
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This note was uploaded on 08/04/2009 for the course BIOL 4125 taught by Professor Christner during the Spring '08 term at LSU.

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20 - PROKARYOTIC DIVERSITY BIOL 4125 SPRING 2009 LECTURE 20...

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