Journal
SYSTEMATIC AND APPLIED MICROBIOLOGY
Volume 43, Issue 2, Pages -Publisher
ELSEVIER GMBH
DOI: 10.1016/j.syapm.2020.126065
Keywords
Bacteroidetes; Na+-NQR; Alternative complex III; caa(3) Cytochrome oxidase; Gliding; T9SS
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Funding
- Max Planck Society
- Spanish Ministry of Science and Innovation and Universities [CLG2015 66686-C3-1-P, PGC2018-096956-B-C41]
- European Regional Development Fund (FEDER)
- Deep Blue Sea Enterprise S.L
- Max-Planck-Institute for Marine Microbiology
- [PR2015-00008]
- [PRX18/00048]
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To date, the phylum Bacteroidetes comprises more than 1,500 described species with diverse ecological roles. However, there is little understanding of archetypal Bacteroidetes traits at a genomic level. In this study, a representative set of 89 Bacteroidetes genomes was compiled, and pairwise reciprocal best-match gene comparisons and gene syntenies were used to identify common traits that allowed Bacteroidetes evolution and adaptive radiation to be traced. The type IX secretion system (T9SS) was highly conserved among all studied Bacteroidetes. Class-level comparisons furthermore suggested that the ACIII-caa(3) COX super-complex evolved in the ancestral aerobic bacteroidetal lineage, and was secondarily lost in extant anaerobic Bacteroidetes. Another Bacteroidetes-specific respiratory chain adaptation was the sodium-pumping Nqr complex I that replaced the ancestral proton-pumping complex I in marine species. T9SS plays a role in gliding motility and the acquisition of complex macro-molecular organic compounds, and the ACIII-caa(3) COX super-complex allows effective control of electron flux during respiration. This combination likely provided ancestral Bacteroidetes with a decisive competitive advantage to effectively scavenge, uptake and degrade complex organic molecules, and therefore has played a pivotal role in the successful adaptive radiation of the phylum. (C) 2020 Elsevier GmbH. All rights reserved.
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