PLANCTOBACTERIA is a taxon created by
Cavalier-Smith , specifically a
division (phylum ). However, it is not followed by the larger
Cavalier-Smith postulated that the
In the Cavalier-Smith bacterial megaclassification, it is within the bacterial Gracilicutes infrakingdom and comprises the phyla Chlamydiae , Lentisphaerae , Planctomycetes , Verrucomicrobia . It has been hypothesised that a member of the PVC clade might have been the host cell in the endosymbiotic event that gave rise to the first proto-eukaryotic cell.
These three groups in the traditional molecular phylogeny view are considered as phyla and also cluster together in what is referred to as the PVC SUPERPHYLUM, along with the candidate phyla OP3 and the Poribacteria. An important molecular marker in the form of a conserved signature protein has been found to be consistently shared by PVC members, with the exception of Poribacteria . The conserved signature protein may be a marker that represents a synapomorphic quality and a means to distinguish this bacterial group. Recent studies have characterized this protein and it has been attributed to play an important housekeeping function in DNA/RNA binding. This observation not only provides a means to demarcate the PVC superphylum, but it supports strongly supports an evolutionary relationship shared by this clade that is distinct from other bacteria.
Conserved signature indels
Additional lines of evidence for the existence of this clade have been found. These include the presence of membrane coat-like proteins, tubulin , sterol synthesis, and the presence of condensed DNA.
* ^ Historically bacteria were considered plants consequently the usage of "division" over "phylum" was brought over when the kingdom Monera was established. The bacteriological code has since imposed that the rank should be phylum and not division. Nevertheless, Cavalier-Smith adopts the term division.
* ^ Cavalier-Smith, T (1987). "The origin of eukaryote and archaebacterial cells". Annals of the New York Academy of Sciences. 503: 17–54. doi :10.1111/j.1749-6632.1987.tb40596.x . PMID 3113314 .
* ^ Krieg, N.R.; Ludwig, W.; Whitman, W.B.; Hedlund, B.P.; Paster,
B.J.; Staley, J.T.; Ward, N.; Brown, D.; Parte, A. (November 24, 2010)
. George M. Garrity, ed. The Bacteroidetes, Spirochaetes, Tenericutes
(Mollicutes), Acidobacteria, Fibrobacteres, Fusobacteria, Dictyoglomi,
Gemmatimonadetes, Lentisphaerae, Verrucomicrobia, Chlamydiae, and
Planctomycetes. Bergey's Manual of Systematic Bacteriology. 4 (2nd
ed.). New York: Springer. p. 908. ISBN 978-0-387-95042-6 . British
Library no. GBA561951.
* ^ A B Cavalier-Smith, T (2002). "The neomuran origin of
archaebacteria, the negibacterial root of the universal tree and
bacterial megaclassification". International Journal of Systematic and
Evolutionary Microbiology. 52 (Pt 1): 7–76. doi
:10.1099/00207713-52-1-7 . PMID 11837318 .
Cavalier-Smith T (2006). "Rooting the tree of life by
transition analyses". Biol. Direct. 1 (1): 19. doi
:10.1186/1745-6150-1-19 . PMC 1586193 . PMID 16834776 .
* ^ Forterre, Patrick (January 2011). "A new fusion hypothesis for
the origin of Eukarya: better than previous ones, but probably also
wrong". Research in Microbiology. 162 (1): 77–91. doi
* ^ Baum, David A; Baum, Buzz (28 October 2014). "An inside-out
origin for the eukaryotic cell". BMC Biology. 12 (1). doi
* ^ Rappe, M. S.; Giovannoni, S. J. (2003). "The Uncultured
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* ^ Woese, C. R. (1987). "Bacterial evolution" . Microbiological
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* ^ Wagner, M.; Horn, M. (2006). "The Planctomycetes,
* v * t * e
G- / OM
Terra-/ Glidobacteria (BV1 )
Sphingobacteria (FCB group)
* Chlorobiales * Ignavibacteriales
Planctobacteria/ (PVC group)
* Lentisphaerales * Oligosphaerales * Victivallales
* Phycisphaerales * Planctomycetales
* Puniceicoccales * Opitutales * Chthoniobacterales * Verrucomicrobiales
* " Poribacteria "
* Acidobacteriales * Acanthopleuribacterales * Holophagales * Solibacterales
* Armatimonadales * Chthonomonadales * Fimbriimonadales
G+ / no OM