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Title: Diverse uncultivated ultra-small bacterial cells in groundwater

Journal Article · · Nature Communications
DOI: https://doi.org/10.1038/ncomms7372 · OSTI ID:1512171
 [1];  [1];  [1];  [2];  [2];  [1];  [1];  [3];  [1]; ORCiD logo [4];  [5];  [5];  [6]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Earth and Planetary Science
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Ecology Dept.
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Geophysics Dept., Earth Sciences Division
  4. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Structural Biology and Imaging Dept., Life Sciences Division
  6. Univ. of California, Berkeley, CA (United States). Dept. of Earth and Planetary Science; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Geophysics Dept., Earth Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Environmental Science, Policy and Management

Bacteria from phyla lacking cultivated representatives are widespread in natural systems and some have very small genomes. Here we test the hypothesis that these cells are small and thus might be enriched by filtration for coupled genomic and ultrastructural characterization. Metagenomic analysis of groundwater that passed through a ~0.2-μm filter reveals a wide diversity of bacteria from the WWE3, OP11 and OD1 candidate phyla. Cryogenic transmission electron microscopy demonstrates that, despite morphological variation, cells consistently have small cell size (0.009±0.002 μm3). Ultrastructural features potentially related to cell and genome size minimization include tightly packed spirals inferred to be DNA, few densely packed ribosomes and a variety of pili-like structures that might enable inter-organism interactions that compensate for biosynthetic capacities inferred to be missing from genomic data. The results suggest that extremely small cell size is associated with these relatively common, yet little known organisms.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1512171
Journal Information:
Nature Communications, Vol. 6, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 240 works
Citation information provided by
Web of Science

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