Heterotrophic Thaumarchaea with Small Genomes Are Widespread in the Dark Ocean

Author:

Aylward Frank O.1ORCID,Santoro Alyson E.2ORCID

Affiliation:

1. Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia, USA

2. Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, California, USA

Abstract

It has been known for many years that marine Thaumarchaeota are abundant constituents of dark ocean microbial communities, where their ability to couple ammonia oxidation and carbon fixation plays a critical role in nutrient dynamics. In this study, we describe an abundant group of putatively heterotrophic marine Thaumarchaeota (HMT) in the ocean with physiology distinct from those of their ammonia-oxidizing relatives. HMT lack the ability to oxidize ammonia and fix carbon via the 3-hydroxypropionate/4-hydroxybutyrate pathway but instead encode a form III-a RuBisCO and diverse PQQ-dependent dehydrogenases that are likely used to conserve energy in the dark ocean. Our work expands the scope of known diversity of Thaumarchaeota in the ocean and provides important insight into a widespread marine lineage.

Publisher

American Society for Microbiology

Subject

Computer Science Applications,Genetics,Molecular Biology,Modelling and Simulation,Ecology, Evolution, Behavior and Systematics,Biochemistry,Physiology,Microbiology

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