Haloplasma

Markus Göker, André Antunes

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Ha.lo.plas’ma. Gr. n. hals, salt; Gr. neut. n. plasma, some- thing formed or molded, a form; N.L. neut. n. Halo- plasma, a salt-loving form. The genus Haloplasma, classified within the family Haloplasmataceae and order Haloplasmatales within the phylum Firmicutes, consists of Gram-negative cells with characteristic contractile cellular protrusions. Cells are pleomorphic, wall-less, and non-spore-forming. When grown on solid media they produce very small colonies with a “fried-egg” appearance. Members of this genus are strictly anaerobic. They are also strictly organotrophic, using a very limited range of substrates, under denitrifying and fermentative conditions. Halo- plasma contractile, the single species of the genus, is moderately halophilic and mesophilic. The major res- piratory lipoquinone is MK-4, and phosphatidylglycerol and bisphosphatidylglycerol are the major polar lipids. Major fatty acids (>10%) are C16:0, C18:0, C18:1ω9c, and summed feature 5 (most likely C18:2ω6,9c). Only one species of the genus Haloplasma has been described to date. H. contractile has been isolated from the brine–sediment interface of deep-sea brine. DNA G+C content: 33.6mol% (based on HPLC); 33.0 mol% (based on the draft genome sequence). Type species: Haloplasma contractile Antunes, Rainey, da Costa and Huber 2008a, 2476VP (Effective publi- cation: Antunes, Rainey, Wanner, Taborda, Pätzold, Nobre, da Costa and Huber 2008b, 3586).
Original languageEnglish
Title of host publicationBergey’s Manual of Systematics of Archaea and Bacteria,
EditorsW.B. Whitman, P. Rainey, P. Kampfer, M. Trujillo, J. Chun, B. DeVos, B. Hedlund, S. Dedysh
PublisherJohn Wiley & Sons
ISBN (Print)9781118960608
Publication statusAccepted/In press - 5 Oct 2018

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Keywords

  • deep-sea brine
  • sediments
  • non-sporulating
  • moderate halophile
  • strict anaerobe
  • organotroph
  • heterotroph
  • fermentative
  • wall-less
  • contractile.

Cite this

Göker, M., & Antunes, A. (Accepted/In press). Haloplasma. In W. B. Whitman, P. Rainey, P. Kampfer, M. Trujillo, J. Chun, B. DeVos, B. Hedlund, & S. Dedysh (Eds.), Bergey’s Manual of Systematics of Archaea and Bacteria, John Wiley & Sons.