Heyndrickxia coagulans

Heyndrickxia coagulans
Gram stain of Heyndrickxia coagulans
Scientific classification Edit this classification
Domain: Bacteria
Kingdom: Bacillati
Phylum: Bacillota
Class: Bacilli
Order: Bacillales
Family: Heyndrickxiaceae
Genus: Heyndrickxia
Species:
H. coagulans
Binomial name
Heyndrickxia coagulans
(Hammer 1915) Narsing Rao et al. 2023
Synonyms
  • Bacillus coagulans (Approved Lists 1980) emend. De Clerck et al. 2004
  • Lactobacillus sporogenes in Bergey's fifth ed.
  • Weizmannia coagulans (Hammer, 1915) Gupta et al., 2020

Heyndrickxia coagulans (formerly Bacillus coagulans) is a lactic acid–forming bacterial species. This species was transferred to Weizmannia in 2020,[1][2] then to Heyndrickxia in 2023.[3][2]

Description

H. coagulans is a catalase-positive, spore-forming, motile, facultative anaerobe rod shaped microbe. H. coagulans is usually seen as Gram positive when a Gram stain test is performed. However, if the Gram stain test is performed while H. coagulans is entering the stationary phase of growth the microbe may appear Gram negative.[2] H. coagulans grows best at 50 °C (122 °F), but the microbe can sustain growth for a temperature range of 30–55 °C (86–131 °F).[2]

Taxonomic history

The species was first isolated and described in 1915 by B.W. Hammer at the Iowa Agricultural Experiment Station as a cause of an outbreak of coagulation in evaporated milk packed by an Iowa condensary.[4] Separately isolated in 1935 and described as Lactobacillus sporogenes in the fifth edition of Bergey's Manual of Systematic Bacteriology, it exhibits characteristics typical of both genera Lactobacillus and Bacillus; its taxonomic position between the families Lactobacillaceae and Bacillaceae was often debated. However, in the seventh edition of Bergey's, it was finally transferred to the genus Bacillus.[2][5]DNA-based technology was used in distinguishing between the two genera of bacteria, which are morphologically similar and possess similar physiological and biochemical characteristics.[6][7]

In 2020, further genetic evidence shows that it is sufficiently different from other members of Bacillus to be transferred into its own genus. As a result, it became the type species of Weizmannia.[1] In 2023, even further genetic evidence shows that Weizmannia was not sufficiently distinct from Heyndrickxia to be an independent genus; as a result, all members of Weizmannia were moved to Heyndrickxia.[3]

One Health

Human health and probiotic qualities

Heyndrixia coagulans is a probiotic which can prove beneficial for a variety of health outcomes. Additionally, this microbe has been found to have potential in preventing cancer with its antipruritic and anti allergenic properties.[8] One unique benefit of H. coagulans is its ability to improve exercise performance. It does this by speeding up the digestion of food in the digestive tract which can help the body absorb essential amino acids (EAA) necessary for improving skeletal muscle mass and lessening muscle damage. Along with EAA, calcium, magnesium, and other important minerals can be absorbed faster. Intestinal epithelial cells form a lining around the intestinal tract to act as a barrier against pathogens while also regulating the absorption of nutrients and water. H. coagulans has the ability to provide nutrients to the epithelial cells, increasing their ability to stick to the intestinal tract and stop pathogen invasion.[9] The strengthening of the intestinal barrier by H. coagulans also serves to treat injuries caused by the alkalizing agent cyclophosphamide (CTX), which is a drug that has been increasingly used to treat cancer. While CTX has also been used to treat autoimmune and hereditary immunological disorders, it can negatively impact the microbiota. H. coagulans is able to help restore the damage done by CTX with its probiotic properties. Another beneficial function of this microbe is that is can reduce oxidative stress by enchaining the activity of essential enzymes which maintain the structure and function of cell membranes. Oxidative stress is caused by an overabundance of free radicals in the cells membrane which can disrupt the body's homeostasis. As a gram-positive bacterium containing lipopolysaccharides in the membrane, H. coagulans can act as an activator of the innate immune response. By increasing the production of the enzymes glutathione peroxidase and superoxide dismutase, the microbe can halt peroxidation reactions and restore the cellular membrane. H. coagulans also produces essential nutrients including niacin, biotin, vitamin B6, vitamin B12, and folic acid which are essential for the bodies metabolic processes[10].

Environmental health

In addition to possessing probiotic qualities that improve human health, research shows that H. coagulans can positively impact certain aspects of environmental health. One of the most notable processes that H. coagulans is able to perform is the conversion of certain organic wastes to lactic acid, which can then be used in a variety of day-to-day substances such as preservatives[11] and cosmetics.[12]

H. coagulans is a thermotolerant bacteria. It is able to use thermotolerant fermentation to successfully convert food waste, like apple and tomato pomaces, into lactic acid. H. coagulans carries out this process by consuming glucose from the food waste and converting it to pyruvate and ATP. The pyruvate is then converted to lactic acid. H. coagulans is able to preform a very high glucose to lactic acid conversion, so very little excess waste is produced. This process provides a way for certain food waste to be reused rather than simply discarded.[13]

Uses

H. coagulans was added to the EFSA to their Qualified Presumption of Safety in 2007 and is still approved as of 2024.[14][15] H. coagulans is also approved for human and animal consumption as GRAS by the U.S. Food and Drug Administration because H. coagulans does not contain mobile genetic elements.[8][16] It is often used in veterinary applications, especially as a probiotic in pigs, cattle, poultry, and shrimp. In humans, H. coagulans has been see to regulate symptoms of irritable bowel syndrome, including diarrhea, constipation, and dehydration, promote normal flora particularly in the reproductive system, and balance immune response.[17][18][19] When consumed orally, H. coagulans has also been effective in both treating as well as preventing recurrence of Clostridioides difficile associated diarrhea in mice.[20][21] Further, one animal research study showed that it can alter inflammatory processes in the context of multiple sclerosis.[22] One strain of this bacterium has also been assessed for safety as a food ingredient.[23] Spores are activated in the acidic environment of the stomach and begin germinating and proliferating in the intestine. Sporeforming H. coagulans strains are used in some countries as probiotics for patients on antibiotics.

Marketing

H. coagulans is often marketed as Lactobacillus sporogenes or a 'sporeforming lactic acid bacterium' probiotic, but this is an outdated name due to taxonomic changes in 1939. Although H. coagulans does produce L+lactic acid, the bacterium used in these products is not a lactic-acid bacterium, as Bacillaceae species do not belong to the lactic acid bacteria (Lactobacillales). By definition, lactic acid bacteria (Lactobacillus, Bifidobacterium) do not form spores. Therefore, using the name Lactobacillus sporogenes is scientifically incorrect.[6][24]

The 2023 name H. coagulans is nowhere as common as the former name Bacillus coagulans. The former name remains valid under the Prokaryotic Code.

References

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