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Genome Analysis of Planctomycetes Inhabiting Blades of the Red Alga Porphyra umbilicalis

Journal Article · · PLoS ONE
 [1];  [2];  [3];  [3];  [4];  [4];  [3];  [3];  [3];  [3];  [4];  [5];  [6]
  1. Univ. of California, Santa Cruz, CA (United States)
  2. Univ. of Maine, Orono, ME (United States)
  3. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  4. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States); HudsonAlpha Institute for Biotechnology, Huntsville, AL (United States)
  5. East Carolina Univ., Greenville, NC (United States)
  6. Carnegie Inst. for Science, Stanford, CA (United States)
Porphyra is a macrophytic red alga of the Bangiales that is important ecologically and economically. We describe the genomes of three bacteria in the phylum Planctomycetes (designated P1, P2 and P3) that were isolated from blades of Porphyra umbilicalis (P.um.1). These three Operational Taxonomic Units (OTUs) belong to distinct genera; P2 belongs to the genus Rhodopirellula, while P1 and P3 represent undescribed genera within the Planctomycetes. Comparative analyses of the P1, P2 and P3 genomes show large expansions of distinct gene families, which can be widespread throughout the Planctomycetes (e.g., protein kinases, sensors/response regulators) and may relate to specific habitat (e.g., sulfatase gene expansions in marine Planctomycetes) or phylogenetic position. Notably, there are major differences among the Planctomycetes in the numbers and sub-functional diversity of enzymes (e.g., sulfatases, glycoside hydrolases, polysaccharide lyases) that allow these bacteria to access a range of sulfated polysaccharides in macroalgal cell walls. These differences suggest that the microbes have varied capacities for feeding on fixed carbon in the cell walls of P.um.1 and other macrophytic algae, although the activities among the various bacteria might be functionally complementary in situ. Additionally, phylogenetic analyses indicate augmentation of gene functions through expansions arising from gene duplications and horizontal gene transfers; examples include genes involved in cell wall degradation (e.g., κ-carrageenase, alginate lyase, fucosidase) and stress responses (e.g., efflux pump, amino acid transporter). Finally P1 and P2 contain various genes encoding selenoproteins, many of which are enzymes that ameliorate the impact of environmental stresses that occur in the intertidal habitat.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1615260
Journal Information:
PLoS ONE, Journal Name: PLoS ONE Journal Issue: 3 Vol. 11; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Anaerobic Degradation of Sulfated Polysaccharides by Two Novel Kiritimatiellales Strains Isolated From Black Sea Sediment journal February 2019
Phylogenomics Provides New Insights into Gains and Losses of Selenoproteins among Archaeplastida journal June 2019
Short-term succession of marine microbial fouling communities and the identification of primary and secondary colonizers journal May 2019
On the maverick Planctomycetes journal July 2018
Permeability shapes bacterial communities in sublittoral surface sediments: Permeability shapes benthic bacterial communities journal February 2017
A common garden experiment with Porphyra umbilicalis (Rhodophyta) evaluates methods to study spatial differences in the macroalgal microbiome journal August 2018

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