Alphaproteobacteria

Alphaproteobacteria
Transmission electron micrograph of Wolbachia within an insect cell.
Credit:Public Library of Science / Scott O'Neill
Scientific classification
Domain: Bacteria
Kingdom: Pseudomonadati
Phylum: Pseudomonadota
Class:
Garrity et al. 2006
Subclasses and orders[1][2][3][4]

And see text

Synonyms[5]
  • Caulobacteria Cavalier-Smith 2020
  • Anoxyphotobacteria (Gibbons and Murray 1978) Murray 1988
  • Photobacteria Gibbons and Murray 1978 (Approved Lists 1980)
  • Alphabacteria Cavalier-Smith 2002

Alphaproteobacteria or α-proteobacteria, also called α-Purple bacteria in earlier literature, is a class of bacteria in the phylum Pseudomonadota (also called "Proteobacteria").[6] The Magnetococcales and Mariprofundales are considered basal or sister to the Alphaproteobacteria.[7][1] The Alphaproteobacteria are highly diverse and possess few commonalities, but nevertheless share a common ancestor. Like all proteobacteria, its members are gram-negative, although some of its intracellular parasitic members lack peptidoglycan and are consequently gram variable.[6][8]

  1. ^ a b Hördt A, López MG, Meier-Kolthoff JP, Schleuning M, Weinhold LM, Tindall BJ, et al. (7 April 2020). "Analysis of 1,000+ Type-Strain Genomes Substantially Improves Taxonomic Classification of 'Alphaproteobacteria'". Frontiers in Microbiology. 11: 468. doi:10.3389/fmicb.2020.00468. PMC 7179689. PMID 32373076.
  2. ^ Ferla MP, Thrash JC, Giovannoni SJ, Patrick WM (2013). "New rRNA gene-based phylogenies of the Alphaproteobacteria provide perspective on major groups, mitochondrial ancestry and phylogenetic instability". PLOS ONE. 8 (12): e83383. Bibcode:2013PLoSO...883383F. doi:10.1371/journal.pone.0083383. PMC 3859672. PMID 24349502.
  3. ^ Alphaproteobacteria in LPSN; Parte, Aidan C.; Sardà Carbasse, Joaquim; Meier-Kolthoff, Jan P.; Reimer, Lorenz C.; Göker, Markus (1 November 2020). "List of Prokaryotic names with Standing in Nomenclature (LPSN) moves to the DSMZ". International Journal of Systematic and Evolutionary Microbiology. 70 (11): 5607–5612. doi:10.1099/ijsem.0.004332.
  4. ^ taxonomy. "Taxonomy browser (Alphaproteobacteria)". www.ncbi.nlm.nih.gov. Retrieved 2025-07-17.
  5. ^ Alphaproteobacteria in LPSN; Parte, Aidan C.; Sardà Carbasse, Joaquim; Meier-Kolthoff, Jan P.; Reimer, Lorenz C.; Göker, Markus (1 November 2020). "List of Prokaryotic names with Standing in Nomenclature (LPSN) moves to the DSMZ". International Journal of Systematic and Evolutionary Microbiology. 70 (11): 5607–5612. doi:10.1099/ijsem.0.004332.
  6. ^ a b Brenner DJ, Krieg NR, Staley T (July 26, 2005) [1984(Williams & Wilkins)]. Garrity GM (ed.). The Proteobacteria. Bergey's Manual of Systematic Bacteriology. Vol. 2C (2nd ed.). New York: Springer. p. 1388. ISBN 978-0-387-24145-6. British Library no. GBA561951.
  7. ^ Cite error: The named reference DM was invoked but never defined (see the help page).
  8. ^ Alphaproteobacteria in LPSN; Parte, Aidan C.; Sardà Carbasse, Joaquim; Meier-Kolthoff, Jan P.; Reimer, Lorenz C.; Göker, Markus (1 November 2020). "List of Prokaryotic names with Standing in Nomenclature (LPSN) moves to the DSMZ". International Journal of Systematic and Evolutionary Microbiology. 70 (11): 5607–5612. doi:10.1099/ijsem.0.004332.
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