Microbial carbon use efficiency predicted from genome-scale metabolic models.

Abstract:

:Respiration by soil bacteria and fungi is one of the largest fluxes of carbon (C) from the land surface. Although this flux is a direct product of microbial metabolism, controls over metabolism and their responses to global change are a major uncertainty in the global C cycle. Here, we explore an in silico approach to predict bacterial C-use efficiency (CUE) for over 200 species using genome-specific constraint-based metabolic modeling. We find that potential CUE averages 0.62 ± 0.17 with a range of 0.22 to 0.98 across taxa and phylogenetic structuring at the subphylum levels. Potential CUE is negatively correlated with genome size, while taxa with larger genomes are able to access a wider variety of C substrates. Incorporating the range of CUE values reported here into a next-generation model of soil biogeochemistry suggests that these differences in physiology across microbial taxa can feed back on soil-C cycling.

journal_name

Nat Commun

journal_title

Nature communications

authors

Saifuddin M,Bhatnagar JM,Segrè D,Finzi AC

doi

10.1038/s41467-019-11488-z

subject

Has Abstract

pub_date

2019-08-08 00:00:00

pages

3568

issue

1

issn

2041-1723

pii

10.1038/s41467-019-11488-z

journal_volume

10

pub_type

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