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“Pomacytosis” - Semi-extracellular phagocytosis of cyanobacteria by the smallest marine algae

“Pomacytosis” - Semi-extracellular phagocytosis of cyanobacteria by the smallest marine algae
“Pomacytosis” - Semi-extracellular phagocytosis of cyanobacteria by the smallest marine algae
The smallest algae, less than 3 μm in diameter, are the most abundant eukaryotes of the World Ocean. Their feeding on planktonic bacteria of similar size is globally important but physically enigmatic. Tiny algal cells tightly packed with the voluminous chloroplasts, nucleus, and mitochondria appear to have insufficient organelle-free space for prey internalization. Here, we present the first direct observations of how the 1.3-μm algae, which are only 1.6 times bigger in diameter than their prey, hold individual Prochlorococcus cells in their open hemispheric cytostomes. We explain this semi-extracellular phagocytosis by the cell size limitation of the predatory alga, identified as the Braarudosphaera haptophyte with a nitrogen (N2)–fixing endosymbiont. Because the observed semi-extracellular phagocytosis differs from all other types of protistan phagocytosis, we propose to name it “pomacytosis” (from the Greek πώμα for “plug”).
1544-9173
Kamennaya, Nina A.
a4845866-c1da-4d89-b3a1-4994efb9f5fe
Kennaway, Gabrielle
579e590c-556a-46da-8547-ce372f8aed80
Fuchs, Bernhard M.
dfa49acc-93b0-4d04-87af-52ec11fa6b0e
Zubkov, Mikhail V.
b1dfb3a0-bcff-430c-9031-358a22b50743
Kamennaya, Nina A.
a4845866-c1da-4d89-b3a1-4994efb9f5fe
Kennaway, Gabrielle
579e590c-556a-46da-8547-ce372f8aed80
Fuchs, Bernhard M.
dfa49acc-93b0-4d04-87af-52ec11fa6b0e
Zubkov, Mikhail V.
b1dfb3a0-bcff-430c-9031-358a22b50743

Kamennaya, Nina A., Kennaway, Gabrielle, Fuchs, Bernhard M. and Zubkov, Mikhail V. (2018) “Pomacytosis” - Semi-extracellular phagocytosis of cyanobacteria by the smallest marine algae. PLoS Biology, 16 (1). (doi:10.1371/journal.pbio.2003502).

Record type: Article

Abstract

The smallest algae, less than 3 μm in diameter, are the most abundant eukaryotes of the World Ocean. Their feeding on planktonic bacteria of similar size is globally important but physically enigmatic. Tiny algal cells tightly packed with the voluminous chloroplasts, nucleus, and mitochondria appear to have insufficient organelle-free space for prey internalization. Here, we present the first direct observations of how the 1.3-μm algae, which are only 1.6 times bigger in diameter than their prey, hold individual Prochlorococcus cells in their open hemispheric cytostomes. We explain this semi-extracellular phagocytosis by the cell size limitation of the predatory alga, identified as the Braarudosphaera haptophyte with a nitrogen (N2)–fixing endosymbiont. Because the observed semi-extracellular phagocytosis differs from all other types of protistan phagocytosis, we propose to name it “pomacytosis” (from the Greek πώμα for “plug”).

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More information

Accepted/In Press date: 15 December 2017
e-pub ahead of print date: 5 January 2018
Published date: 5 January 2018

Identifiers

Local EPrints ID: 416770
URI: https://eprints.soton.ac.uk/id/eprint/416770
ISSN: 1544-9173
PURE UUID: 8d1a0e06-4382-4121-a98a-02baa7a2077b

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Date deposited: 10 Jan 2018 17:30
Last modified: 26 Mar 2018 16:31

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Contributors

Author: Nina A. Kamennaya
Author: Gabrielle Kennaway
Author: Bernhard M. Fuchs
Author: Mikhail V. Zubkov

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