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Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
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Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
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The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
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Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...
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Natural Transformation, Protein Expression, and Cryoconservation of the Filamentous Cyanobacterium Phormidium lacuna
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Paulinella chromatophora.

Luis Macorano1, Eva C M Nowack1

  • 1Institute for Microbial Cell Biology, Biology Department, Heinrich Heine University Düsseldorf, Düsseldorf, Germany.

Current Biology : CB
|September 14, 2021
PubMed
Summary

The study overviews Paulinella chromatophora, a unique amoeba with a chromatophore organelle. This organism represents a rare instance of primary endosymbiosis between a eukaryote and a photosynthetic bacterium, offering insights into early symbiotic stages.

Area of Science:

  • Eukaryotic cell biology
  • Microbiology
  • Symbiosis research

Background:

  • Paulinella chromatophora is a filose amoeba.
  • It harbors a unique organelle, the chromatophore.
  • This represents a rare case of primary endosymbiosis.

Purpose of the Study:

  • To provide an overview of Paulinella chromatophora.
  • To highlight its significance as a model for studying early endosymbiosis.
  • To explore the dynamics of a young eukaryote-cyanobacteria relationship.

Main Methods:

  • Literature review and synthesis of existing research.
  • Comparative analysis of endosymbiotic events.
  • Phylogenetic and genomic data interpretation.

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Main Results:

  • Paulinella chromatophora harbors a photosynthetic bacterial endosymbiont within a specialized organelle (chromatophore).
  • This endosymbiotic event is a relatively recent evolutionary occurrence.
  • The organism provides a unique window into the initial stages of organelle establishment.

Conclusions:

  • Studying Paulinella chromatophora is crucial for understanding the fundamental processes of primary endosymbiosis.
  • This model system can elucidate the genetic and cellular mechanisms driving the integration of endosymbionts.
  • Further research on this organism will advance our knowledge of eukaryote evolution.