Subsurface Stappia: Success Through Defence, Specialisation and Putative Pressure-Dependent Carbon Fixation.

Abstract:

:Diverse microbial communities living in subsurface coal seams are responsible for important geochemical processes including the movement of carbon between the geosphere, biosphere and atmosphere. Microbial conversion of the organic matter in coal to methane involves a complex assemblage of bacteria and archaea working in syntrophic relationships. Despite the importance and value of this microbial process, very few of the microbial taxa have defined metabolic or ecological roles in these environments. Additionally, the genomic features mediating life in this chemically reduced, energy poor, deep subsurface environment are not well characterised. Here we describe the isolation and genomic and catabolic characterisation of three alphaproteobacterial Stappia indica species from three coal basins across Australia. S. indica genomes from coal seams were compared with those from closely related S. indica isolated from diverse surface waters, revealing a coal seam-specific suite of genes associated with life in the subsurface. These genes are linked to processes including viral defence, secondary metabolite production, polyamine metabolism, polypeptide uptake membrane transporters and putative energy neutral pressure-dependent CO2 fixation. This indicates that subsurface Stappia have diverse metabolisms for biomass recycling and pressure-dependent CO2 fixation and require a suite of defensive and competitive strategies relative to their surface-dwelling relatives.

journal_name

Microb Ecol

journal_title

Microbial ecology

authors

Vick SHW,Greenfield P,Willows RD,Tetu SG,Midgley DJ,Paulsen IT

doi

10.1007/s00248-019-01471-y

subject

Has Abstract

pub_date

2020-07-01 00:00:00

pages

34-46

issue

1

eissn

0095-3628

issn

1432-184X

pii

10.1007/s00248-019-01471-y

journal_volume

80

pub_type

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