Gloeobacter violaceus: primitive reproductive scheme and its significance

Montejano, Gustavo; Becerra-Absalón, Itzel; Gold-Morgan, Michele; Osorio‐Santos, Karina

doi:10.1007/s00606-018-1542-z

Cited by 11 publications

(11 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Researchers have attempted to extract evolutionary information by studying the photosynthetic genus Gloeobacter, which is an outgroup to all other Cyanobacteria [21][22][23][24]. In these studies, traits absent from Gloeobacter species but common in other Cyanobacteria are interpreted to have evolved after the divergence of Gloeobacter.…”

Section: Introductionmentioning

confidence: 99%

“…lack several PSII proteins, including PsbY, PsbZ and Psb27, and others are poorly conserved, including PsbO, PsbU, and PsbV [31]. The absence of the thylakoid membrane, differences in light harvesting, and missing photosynthesis proteins have been used by some researchers to constrain models for the evolution of oxygenic photosynthesis as well as the ecology and photochemistry of ancestral Cyanobacteria [23,24,32].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A phylogenetically novel cyanobacterium most closely related to Gloeobacter

et al. 2020

View full text Add to dashboard Cite

Clues to the evolutionary steps producing innovations in oxygenic photosynthesis may be preserved in the genomes of organisms phylogenetically placed between non-photosynthetic Vampirovibrionia (formerly Melainabacteria) and the thylakoid-containing Cyanobacteria. However, only two species with published genomes are known to occupy this phylogenetic space, both within the genus Gloeobacter. Here, we describe nearly complete, metagenome-assembled genomes (MAGs) of an uncultured organism phylogenetically placed near Gloeobacter, for which we propose the name Candidatus Aurora vandensis {Au'ro.ra. L. fem. n. aurora, the goddess of the dawn in Roman mythology; van.de'nsis. N.L. fem. adj. vandensis of Lake Vanda, Antarctica}. The MAG of A. vandensis contains homologs of most genes necessary for oxygenic photosynthesis including key reaction center proteins. Many accessory subunits associated with the photosystems in other species either are missing from the MAG or are poorly conserved. The MAG also lacks homologs of genes associated with the pigments phycocyanoerethrin, phycoeretherin and several structural parts of the phycobilisome. Additional characterization of this organism is expected to inform models of the evolution of oxygenic photosynthesis.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A phylogenetically novel cyanobacterium most closely related to Gloeobacter

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Photosynthetic organisms have specific pigment–protein complexes called antennas that capture light energy and then send excitation energy to the photosynthetic reaction centers, where the primary photochemical reactions occur. Cyanobacteria are believed to be primordial organisms that perform oxygenic photosynthesis and their antenna systems consist of phycobiliproteins, which form the phycobilisome (PBS) complex, located outside of thylakoid membranes [ 1 , 2 , 3 , 4 , 5 , 6 ]. Cyanobacterial thylakoid membranes contain photosystems I (PSI) and II (PSII), which are universal to all oxyphototrophs but have a lack of typical light-harvesting complexes (LHC) that can only be found in photosynthetically active eukaryotic cells.…”

Section: Introductionmentioning

confidence: 99%

“…The cell membrane contains photosynthetic apparatus with chlorophyll (chl), various types of carotenoids (car), and phycobiliproteins as antenna pigments [ 1 , 36 , 37 , 38 ]. The G. violaceus features mentioned above indicate that this strain belongs to the phylogenetically oldest form of cyanobacteria [ 5 , 6 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

The Role of Selected Wavelengths of Light in the Activity of Photosystem II in Gloeobacter violaceus

Kula-Maximenko

Zieliński

Ślesak

2021

IJMS

View full text Add to dashboard Cite

Gloeobacter violaceus is a cyanobacteria species with a lack of thylakoids, while photosynthetic antennas, i.e., phycobilisomes (PBSs), photosystem II (PSII), and I (PSI), are located in the cytoplasmic membrane. We verified the hypothesis that blue–red (BR) light supplemented with a far-red (FR), ultraviolet A (UVA), and green (G) light can affect the photosynthetic electron transport chain in PSII and explain the differences in the growth of the G. violaceus culture. The cyanobacteria were cultured under different light conditions. The largest increase in G. violaceus biomass was observed only under BR + FR and BR + G light. Moreover, the shape of the G. violaceus cells was modified by the spectrum with the addition of G light. Furthermore, it was found that both the spectral composition of light and age of the cyanobacterial culture affect the different content of phycobiliproteins in the photosynthetic antennas (PBS). Most likely, in cells grown under light conditions with the addition of FR and G light, the average antenna size increased due to the inactivation of some reaction centers in PSII. Moreover, the role of PSI and gloeorhodopsin as supplementary sources of metabolic energy in the G. violaceus growth is discussed.

show abstract

“…Gloeobacteria, on the other hand, is rather enigmatic and has only two species described thus far: Gloeobacter violaceus and G. kilaueensis. Little is known about the ecology and distribution of these two species; G. kilaueensis is only known from a lava cave in Hawaii 7 , and G. violaceus was originally isolated from a limestone rock in the Swiss alps 8 and subsequently reported on waterfall walls in Europe and Mexico 9,10 . The diversity of Gloeobacteria is likely much greater than these two species, as evidenced by a few distinct 16S clades from environmental samples 11 and a recent metagenome-assembled genome (MAG), Candidatus Aurora vandensis, from Lake Vanda, Antarctica 12 .…”

Section: Introductionmentioning

confidence: 99%

Revisiting the early evolution of Cyanobacteria with a new thylakoid-less and deeply diverged isolate from a hornwort

Rahmatpour

Hauser

Nelson

et al. 2021

Preprint

View full text Add to dashboard Cite

Cyanobacteria have played pivotal roles in Earth's geological history especially during the rise of atmospheric oxygen. However, our ability to infer the early transitions in Cyanobacteria evolution has been limited by their extremely lopsided tree of life-the vast majority of extant diversity belongs to Phycobacteria (or "crown Cyanobacteria"), while its sister lineage, Gloeobacteria, is depauperate and contains only two closely related species of Gloeobacter and a metagenome-assembled genome. Here we describe a new culturable member of Gloeobacteria, Anthocerobacter panamensis, isolated from a tropical hornwort. Anthocerobacter diverged from Gloeobacter over 1.4 billion years ago and has low 16S identities with environmental samples. Our ultrastructural, physiological, and genomic analyses revealed that this species possesses a unique combination of traits that are exclusively shared with either Gloeobacteria or Phycobacteria. For example, similar to Gloeobacter, it lacks thylakoids and circadian clock genes, but the carotenoid biosynthesis pathway is typical of Phycobacteria. Furthermore, Anthocerobacter has one of the most reduced gene sets for photosystems and phycobilisomes among Cyanobacteria. Despite this, Anthocerobacter is capable of oxygenic photosynthesis under a wide range of light intensities, albeit with much less efficiency. Given its key phylogenetic position, distinct trait combination, and availability as a culture, Anthocerobacter opens a new window to further illuminate the dawn of oxygenic photosynthesis.

show abstract

Gloeobacter violaceus: primitive reproductive scheme and its significance

Cited by 11 publications

References 42 publications

A phylogenetically novel cyanobacterium most closely related to Gloeobacter

A phylogenetically novel cyanobacterium most closely related to Gloeobacter

The Role of Selected Wavelengths of Light in the Activity of Photosystem II in Gloeobacter violaceus

Revisiting the early evolution of Cyanobacteria with a new thylakoid-less and deeply diverged isolate from a hornwort

Contact Info

Product

Resources

About