''Leuconostoc'' is a genus of

gram-positive In bacteriology, gram-positive bacteria are bacteria that give a positive result in the Gram stain test, which is traditionally used to quickly classify bacteria into two broad categories according to their type of cell wall. Gram-positive bact ...

bacteria Bacteria (; singular: bacterium) are ubiquitous, mostly free-living organisms often consisting of one Cell (biology), biological cell. They constitute a large domain (biology), domain of prokaryotic microorganisms. Typically a few micrometr ...

, placed within the family of

Lactobacillaceae The ''Lactobacillaceae'' are a family of lactic acid bacteria. It is the only family in the lactic acid bacteria which includes homofermentative and heterofermentative organisms; in the ''Lactobacillaceae,'' the pathway used for hexose fermentati ...

. They are generally ovoid

cocci A coccus (plural cocci) is any bacterium or archaeon that has a spherical, ovoid, or generally round shape. Bacteria are categorized based on their shapes into three classes: cocci (spherical-shaped), bacillus (rod-shaped) and spiral ( of whi ...

often forming chains. ''Leuconostoc'' spp. are intrinsically resistant to

vancomycin Vancomycin is a glycopeptide antibiotic medication used to treat a number of bacterial infections. It is recommended intravenously as a treatment for complicated skin infections, bloodstream infections, endocarditis, bone and joint infections, ...

and are catalase-negative (which distinguishes them from

staphylococci ''Staphylococcus'' is a genus of Gram-positive bacteria in the family Staphylococcaceae from the order Bacillales. Under the microscope, they appear spherical ( cocci), and form in grape-like clusters. ''Staphylococcus'' species are facultati ...

). All species within this genus are heterofermentative and are able to produce

dextran Dextran is a complex branched glucan ( polysaccharide derived from the condensation of glucose), originally derived from wine. IUPAC defines dextrans as "Branched poly-α-d-glucosides of microbial origin having glycosidic bonds predominantly C-1 ...

from sucrose. They are generally slime-forming. Blamed for causing the 'stink' when creating a sourdough starter, some species are also capable of causing human infection. Because they are an uncommon cause of disease in humans, standard commercial identification kits are often unable to identify the organism. ''Leuconostoc'' spp., along with other lactic acid bacteria such as ''

Pediococcus ''Pediococcus'' is a genus of gram-positive lactic acid bacteria, placed within the family of Lactobacillaceae. They usually occur in pairs or tetrads, and divide along two planes of symmetry, as do the other lactic acid cocci genera '' Aerococc ...

'' and ''

Lactobacillus ''Lactobacillus'' is a genus of Gram-positive, aerotolerant anaerobes or microaerophilic, rod-shaped, non-spore-forming bacteria. Until 2020, the genus ''Lactobacillus'' comprised over 260 phylogenetically, ecologically, and metabolically div ...

'', are responsible for the fermentation of cabbage, making it

sauerkraut Sauerkraut (; , "sour cabbage") is finely cut raw cabbage that has been fermented by various lactic acid bacteria. It has a long shelf life and a distinctive sour flavor, both of which result from the lactic acid formed when the bacteria ferm ...

. In this process, fresh cabbage is fermented in a light brine, where the sugars in the cabbage are transformed by lactofermentation to

lactic acid Lactic acid is an organic acid. It has a molecular formula . It is white in the solid state and it is miscible with water. When in the dissolved state, it forms a colorless solution. Production includes both artificial synthesis as well as nat ...

which gives the cabbage a sour flavour and good keeping qualities. ''Leuconostoc'' spp. are similarly part of the symbiotic colonies of bacteria and yeast (

SCOBY Symbiotic culture of bacteria and yeast (SCOBY) is a culinary symbiotic fermentation culture ( starter) consisting of lactic acid bacteria (LAB), acetic acid bacteria (AAB), and yeast which arises in the preparation of sour foods and beverages s ...

) involved in the fermentation of

kefir Kefir ( ; also spelled as kephir or kefier; ; ; ) is a fermented milk drink similar to a thin yogurt or ayran that is made from kefir grains, a specific type of mesophilic symbiotic culture. The drink originated in the North Caucasus, in p ...

, a fermented milk beverage and

kombucha Kombucha (also tea mushroom, tea fungus, or Manchurian mushroom when referring to the culture; Latin name ''Medusomyces gisevii'') is a fermented, lightly effervescent, sweetened black tea drink commonly consumed for its purported health b ...

, a fermented tea.

Species

The genus ''Leuconostoc'' comprises the following species: * '' Leuconostoc carnosum'' Shaw and Harding 1989 * ''

Leuconostoc citreum ''Leuconostoc citreum'' is a vancomycin- resistant, Gram-positive In bacteriology, gram-positive bacteria are bacteria that give a positive result in the Gram stain test, which is traditionally used to quickly classify bacteria into two broa ...

'' Farrow ''et al''. 1989 * ''

Leuconostoc falkenbergense ''Leuconostoc falkenbergense'' is a bacterium from the genus of ''Leuconostoc ''Leuconostoc'' is a genus of gram-positive bacteria, placed within the family of Lactobacillaceae. They are generally ovoid cocci often forming chains. ''Leucon ...

'' Wu and Gu 2021 * '' Leuconostoc fallax'' Martinez-Murcia and Collins 1992 * "''Leuconostoc garlicum''" Kim ''et al''. 2002 * '' Leuconostoc gelidum'' Shaw and Harding 1989 * '' Leuconostoc holzapfelii'' De Bruyne ''et al''. 2007 * '' Leuconostoc inhae'' Kim ''et al''. 2003 * '' Leuconostoc kimchii'' Kim ''et al''. 2000 * '' Leuconostoc lactis'' Garvie 1960 (Approved Lists 1980) * '' Leuconostoc litchii'' Chen ''et al''. 2020 * ''

Leuconostoc mesenteroides ''Leuconostoc mesenteroides'' is a species of lactic acid bacteria associated with fermentation, under conditions of salinity and low temperatures (such as lactic acid production in fermented sausages). In some cases of vegetable and food storage ...

'' (Tsenkovskii 1878) van Tieghem 1878 (Approved Lists 1980) * '' Leuconostoc miyukkimchii'' Lee ''et al''. 2012 * '' Leuconostoc palmae'' Ehrmann ''et al''. 2009 * ''

Leuconostoc pseudomesenteroides ''Leuconostoc pseudomesenteroides'' is an intrinsically vancomycin- resistant, Gram-positive In bacteriology, gram-positive bacteria are bacteria that give a positive result in the Gram stain test, which is traditionally used to quickly clas ...

'' Farrow ''et al''. 1989 * '' Leuconostoc rapi'' Lyhs ''et al''. 2015 * '' Leuconostoc suionicum'' (Gu ''et al''. 2012) Jeon ''et al''. 2017

''Leuconostoc citrovorum''

The name ''Leuconostoc citrovorum'' (Hammer) Hucker and Pederson 1931 was rejected in 1971 as a '' nomen dubium'' by the Judicial Commission of

International Committee on Systematics of Prokaryotes The International Committee on Systematics of Prokaryotes (ICSP), formerly the International Committee on Systematic Bacteriology (ICSB), is the body that oversees the nomenclature of prokaryotes, determines the rules by which prokaryotes are named ...

(in Opinion 45).

Phylogeny

The currently accepted taxonomy is based on the

List of Prokaryotic names with Standing in Nomenclature List of Prokaryotic names with Standing in Nomenclature (LPSN) is an online database that maintains information on the nomenclature, naming and Taxonomy (biology), taxonomy of prokaryotes, following the taxonomy requirements and rulings of the In ...

and the phylogeny is based on whole-genome sequences.

References

External links

List of species of the genus ''Leuconostoc''

''Leuconostoc''
MicrobeWiki Lactobacillaceae Garde manger Bacteria used in dairy products Bacteria genera {{lactobacilli-stub