Alkalihalobacillus

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Alkalihalobacillus
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Domain: Bacteria
Phylum: Bacillota
Class: Bacilli
Order: Bacillales
Family: Bacillaceae
Genus: Alkalihalobacillus
Patel and Gupta 2020
Species [1]
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Alkalihalobacillus is a genus of gram-positive or gram-variable rod-shaped bacteria in the family Bacillaceae from the order Bacillales . [2] [3] The type species of this genus is Alkalihalobacillus alcalophilus. [4]

Contents

This genus comprises species formerly belonging to the genus Bacillus , a genus that has been recognized as displaying extensive polyphyly and phylogenetic heterogeneity due to the vague criteria [5] (such as the ability to form endospores in the presence of oxygen) [6] previously used to assign species to this clade. Multiple studies using comparative phylogenetic analyses have been published in an attempt to clarify the evolutionary relationships between Bacillus species, resulting in the establishment of numerous novel genera such as Alkalihalobacillus, Brevibacillus, Solibacillus , Alicyclobacillus and Virgibacillus . [2] [7] [8] [9] [10] The genus Bacillus is now restricted to species closely related to Bacillus subtilis and Bacillus cereus . [2] [11]

The name Alkalihalobacillus is composed of the prefix "alkali-" (from the Arabic article and noun al galiy, which translates to 'the ashes of saltwort'), the prefix "halo-" (from the Greek noun hals/halos, meaning salt) and suffixed by "-bacillus" (from the Latin noun bacillus, referring to 'a small staff or rod' and Bacillus, a bacterial genus). Together, the name refers to bacillus living in salty or alkaline conditions, or salty and alkaline conditions. [2]

Taxonomy

This genus, as of May 2021, contains a total of 44 species, 39 of which have been validly published and have established names. [4] This genus was identified as a monophyletic clade and phylogenetically unrelated to other Bacillus species in studies examining the taxonomic relationships within Bacillus. [2] This branching pattern is also observed in the Genome Taxonomy Database (GTDB). [12]

Two additional Bacillus species (Bacillus alcaliphilum and Bacillus alkalisoli) are found to group with other members of Alkalihalobacillus in phylogenetic trees as well as share the same molecular markers in the form of conserved signature indels (CSIs). [11] However, their transfer was not officially proposed due to the lack of culture strain information. Further revision of this genus is required as additional genomes and novel species are discovered and assigned.

Accepted species

Biochemical characteristics and molecular signatures

Most members of this genus are aerobic or facultatively anaerobic and are found in diverse locations such as hypersaline lakes, coastal regions and soil. All species, with the exception of Alkalihalobacillus okhensis, [13] are able to produce endospores. Motility is variable, with some species possessing peritrichous flagella. The majority of species from this genus are alkaliphilic and halophilic/tolerant, and thus they are able to grow in alkaline conditions, with the optimal growth rate being in the pH range of 9–10 with 1-5% NaCl. [2] Some species are obligately alkaliphilic and require very alkaline conditions to survive. A wide range of temperature (4-45 °C) can be conducive to growth; however, optimal growth occurs in the range of 25-37 °C. Some species are able to produce enzymes such as cellulases and proteases, which are used in laundry detergent manufacturing, xylanases for the pulp paper sector[ further explanation needed ] and cyclodextrin glucanotransferase for starch treatment. [2] In addition, A. clausii is diazotrophic and able to convert atmospheric nitrogen into ammonia [14] and it is also able to produce antimicrobial compounds for the manufacturing of probiotic. [15] [ failed verification ]

Through genomic analysis, ten CSIs have been identified for this genus in the following proteins: RNase adapter RapZ, flagellar basal body M-ring protein FliF, 7-carboxy-7-deazaguanine synthase QueE, peptide chain release factor 3, type I glutamate-ammonia ligase, tRNA threonyl-carbamoyladenosine dehydratase, transcription-repair coupling factor, tRNA uridine-5- carboxymethylaminomethyl (34) synthesis enzyme MnmG, 50S ribosomal protein L11 methyltransferase, and homoserine kinase. [2] These CSIs are specific for Alkalihalobacillus and provide a novel way to molecularly differentiate this genus from other Bacillaceae genera and bacteria.

Related Research Articles

Caldibacillus is a facultative anaerobe genus of bacteria that stains Gram-positive from the family of Bacillaceae. The type species of this genus is Caldibacillus debilis.

Metabacillus is a genus of rod-shaped bacteria exhibiting Gram-positive or Gram-variable staining in the family Bacillaceae within the order Bacillales. The type species for this genus is Metabacillus fastidiosus.

Peribacillus is a genus of rod-shaped bacteria that exhibits Gram-positive or Gram-variable staining that belongs in the family Bacillaceae within the order Bacillales. The type species for this genus is Peribacillus simplex.

Mesobacillus is a genus of gram-positive or gram-variable, rod-shaped bacteria in the family Bacillaceae within the order Bacillales. The type species for this genus is Mesobacillus jeotgali.

Ectobacillus is a genus of Gram-positive, rod-shaped bacteria in the family Bacillaceae within the order Bacillales. The type species for this genus is Ectobacillus panaciterrae.

Evansella is a genus of Gram-positive rod-shaped bacteria in the family Bacillaceae within the order Bacillales. The type species for this genus is Evansella cellulosilytica.

Ferdinandcohnia is a genus of rod-shaped bacteria that generally display Gram-positive staining in the family Bacillaceae within the order Bacillales. The type species for this genus is Ferdinandcohnia humi.

Gottfriedia is a genus of gram-positive or Gram-variable rod-shaped bacteria in the family Bacillaceae within the order Bacillales. The type species for this genus is Gottfriedia luciferensis.

Heyndrickxia is a genus of gram-positive rod-shaped bacteria in the family Bacillaceae within the order Bacillales. The type species for this genus is Heyndrickxia oleronia.

Litchfieldia is a genus of Gram-positive rod-shaped bacteria in the family Bacillaceae within the order Bacillales. The type species for this genus is Litchfieldia alkalitelluris.

Margalitia is a genus of gram-positive or gram-variable rod-shaped bacteria in the family Bacillaceae from the order Bacillales. The type species of this genus is Margalitia shackletonii.

Niallia is a genus of Gram-Positive rod-shaped bacteria in the family Bacillaceae from the order Bacillales. The type species of this genus is Niallia circulans.

<span class="mw-page-title-main">Priestia</span> Genus of bacteria

Priestia is a genus of mostly Gram-positive, rod-shaped bacteria in the family Bacillaceae from the order Bacillales. The type species of this genus is Priestia megaterium.

Robertmurraya is a genus of mostly Gram-Positive rod-shaped bacteria in the family Bacillaceae from the order Bacillales. The type species of this genus is Robertmurraya siralis.

Rossellomorea is a genus of Gram-Positive or Gram-variable staining rod-shaped bacteria in the family Bacillaceae from the order Bacillales. The type species of this genus is Rossellomorea aquimaris.

Schinkia is a genus of Gram-positive rod-shaped bacteria in the family Bacillaceae from the order Bacillales. The type species of this genus is Schinkia azotoformans.

Siminovitchia is a genus of Gram-Positive or Gram-negative rod-shaped bacteria in the family Bacillaceae from the order Bacillales. The type species of this genus is Siminovitchia fortii.

Sutcliffiella is a genus of Gram-Positive rod-shaped bacteria in the family Bacillaceae from the order Bacillales. The type species of this genus is Sutcliffiella cohnii.

Weizmannia is a genus of Gram-Positive rod-shaped bacteria in the family Bacillaceae from the order Bacillales. The type species of this genus is Weizmannia coagulans.

Alkalicoccus is a genus of Gram-Positive rod-shaped bacteria in the family Bacillaceae from the order Bacillales. The type species of this genus is Alkalicoccus saliphilus.

References

  1. Information based on LPSN 2021
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  3. Brenner, Don J.; Krieg, Noel R.; Staley, James T.; Garrity, George M.; Boone, David R.; De Vos, Paul; Goodfellow, Michael; Rainey, Fred A.; Schleifer, Karl-Heinz, eds. (2005). Bergey's Manual® of Systematic Bacteriology. doi:10.1007/0-387-28022-7. ISBN   978-0-387-24144-9.
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