Multiple evolutionary origins of prochlorophytes, the chlorophyllb-containing prokaryotes

@article{Palenik1992MultipleEO,
  title={Multiple evolutionary origins of prochlorophytes, the chlorophyllb-containing prokaryotes},
  author={Brian Palenik and Robert Haselkorn},
  journal={Nature},
  year={1992},
  volume={355},
  pages={265-267}
}
PROCHLOROPHYTES are prokaryotes that carry out oxygenic photosynthesis using chlorophylls a and b, but lack phycobili-proteins as light-harvesting pigments1. These characteristics distinguish them from cyanobacteria, which contain phycobiliproteins, but no chlorophyll b. Three prochlorophyte genera have been described: Prochloron1–3,Prochlorothrix4andProchlorococcus5,6. The prochlorophytes share their pigment characteristics with green plant and euglenoid chloroplasts, which has led to a debate… 
Multiple evolutionary origins of prochlorophytes within the cyanobacterial radiation
TLDR
The results from 16S ribosomal RNA sequence comparisons indicate that prochlorophytes are polyphyletic within the cyanobacterial radiation, and suggest that none of the known species is specifically related to chloroplasts.
Prochlorophyte Evolution and the Origin of Chloroplasts: Morphological and Molecular Evidence
TLDR
Current evidence from both kinds of investigations is summarized, to reconcile the morphological and molecular sequence data with a coherent picture of prochlorophyte and chloroplast evolution.
The Photosynthetic Apparatus of Chlorophyll b- and d-Containing Oxyphotobacteria
TLDR
This chapter shows that the main trait linking these prokaryotes is the similar nature of their antenna proteins, called Pcbs for ‘prochlorophy te chlorophyll b-binding’ proteins, which closely resemble iron-stress induced proteins, used for light-harvesting by Photosystem I in some cyanobacteria when iron-starved.
The prochlorophytes: are they more than just chlorophyll a/b-containing cyanobacteria?
TLDR
It is proposed that the structure of the light-harvesting complexes (LHC) from prochlorophytes is very different from those of chloroplast systems, and is evolutionarily very ancient.
Chlorophyll b and phycobilins in the common ancestor of cyanobacteria and chloroplasts
TLDR
Phylogenetic analyses show that the chlorophyll b synthesis genes (chlorophyll a oxygenase) from two prochlorophytes and from major groups of chlorophytes share a common evolutionary origin, which indicates that the progenitors of oxygenic photosynthetic bacteria, including the ancestor of chloroplasts, had both chlorophyLL b and phycobilins.
The photosynthetic machinery in prochlorophytes: Structural properties and ecological significance
TLDR
It is proposed that the structure of the light-harvesting complexes from Prochlorophytes is very different from those of chloroplast systems, and is evolutionarily very ancient.
Prochlorophytes: The ‘Other’ Cyanobacteria?
TLDR
Given the identification of a number of distinctive differences in the organization of the photosynthetic apparatus in these two types of procaryotes performing oxygenic photosynthesis it would be appropriate to support and extend the suggestion of Gibbons and Murray (1978) and Florenzano et al. (1986) to institute two orders—i.e., Cyanobacteria and Oxychlorobacteria—within the class of the Oxyphotobacteria.
Cyanobacteria of the Genus Prochlorothrix†
TLDR
The evolutionary scenario for green cyanobacteria is suggested taking into account their possible role in the origin of simple chloroplast and the growing evidence for naturally occurring Prochlorothrix.
The Prochlorophytes - An Algal Enigma
TLDR
The history of the discovery of Prochlorophytes is presented and the shift in focus that each new species has brought along is discussed, together with the contribution which each has made to widely different areas such as molecular phylogeny, photosynthesis and biological oceanography.
Phycoerythrins of the oxyphotobacterium Prochlorococcus marinus are associated to the thylakoid membrane and are encoded by a single large gene cluster
TLDR
Experiments show that the Prochlorococcus PEs are specifically associated to the thylakoid membrane and that the protein level does not significantly vary as a function of light irradiance or growth phase.
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The results from 16S ribosomal RNA sequence comparisons indicate that prochlorophytes are polyphyletic within the cyanobacterial radiation, and suggest that none of the known species is specifically related to chloroplasts.
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TLDR
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