A colorless crystalline important amino acid C4H9NO3. [1]


L-threonine is a necessary amino acid in human beings, implying that it can not be synthesized in the body. The chemical formula for L-threonine is HO2CCH( NH2) CH( OH) CH3, and its DNA codons are ACA, ACC, ACG and ACU. L-threonine is among the 20 common proteinogenic amino acids for humans, which are used to construct proteins. It is also a polar amino acid and among the two proteinogenic amino acids that contain alcohol groups. The American nutritional expert William Cumming Rose found threonine throughout the 1930s, making it the last of the typical proteinogenic amino acids to be discovered.

Threonine can be prepared in the laboratory by responding mercury acetate with crotonic acid. This procedure yields a racemic mix of threonine, implying that it produces both D-threonine and L-threonine. Nevertheless, just L-threonine is biologically active for human beings. Many plants and some microorganisms can synthesize L-threonine by using homoserine and alpha-aspartyl-semialdehyde to produce aspartic acid. Aspartic acid can then be minimized to yield L-threonine. [2]

System of action

L-Threonine is a precursor to the amino acids glycine and serine. It serves as a lipotropic in controlling fat build-up in the liver. May assist combat mental disorder and may be very helpful in indigestion and digestive tract breakdowns. Also, threonine prevents extreme liver fat. Nutrients are more readily soaked up when threonine is present. [3]


L-Threonine promotes normal growth by helping to keep the proper protein balance in the body. L-Threonine likewise supports cardiovascular, liver, central nervous, and body immune system function. Threonine is needed to create glycine and serine, two amino acids that are necessary for the production of collagen, elastin, and muscle tissue. Threonine helps keep connective tissues and muscles throughout the body strong and flexible, consisting of the heart, where it is found in considerable quantities. It likewise helps develop strong bones and tooth enamel, and may speed wound healing or recovery from injury. Threonine integrates with the amino acids aspartic acid and methionine to help the liver with lipotropic function, or the digestion of fats and fats. Without enough threonine in the body, fats might develop in the liver and ultimately trigger liver failure. Threonine supports the immune system by assisting in the production of antibodies. [4]

Food Sources

1. Turkey

A lump of protein-rich meat such as turkey is known to effectively supplement the body with threonine. In fact, it is widely credited to be one of the wealthiest sources of threonine by the U.S Department of Health and Agriculture. An 85-gram serving of turkey is 1090 milligrams of threonine. This serving itself can provide you with 61 % of your threonine needs if you occur to be a male or 72 % your consumption needs if you occur to be a lady.

% of Threonine in 100 gms: 100 %– 104 %.

2. Egg White Powder

With no saturated fats or cholesterol, egg whites powder can be an excellent source of threonine. One can use egg white powder whilst baking as a two-tablespoon serving is known to include 513 milligrams of threonine. This is 30 % of a male’s everyday threonine needs and 34 % of what a female needs every day.

3. Soy Products

Vegans have yet another factor to rejoice over soy items as soy is understood to be a rich source of threonine. A cup of raw soybeans is known to include 3,000 milligrams of threonine. This is far above the daily requirement of both men and women. Soy flour, soy milk, tofu and soy nuggets can likewise be added to our diet plan to supplement our threonine requires.

% of Threonine in 100 gms: 22 %.

4. Lean Beef

Lean beef is understood to be an abundant source of threonine mainly depending upon how it is cooked. The leading loin of beef filet without bones when grilled is understood to consist of 2142 milligrams of threonine that makes beef a protein source par excellence for men, females and children.

% of Threonine in 100 gms: 134 %.

5. Chicken Breast

While chicken is commonplace meat in our daily diets, we are hardly aware that it is rich in threonine. One entire cooked chicken is understood to contain 137 % of threonine RDI. It likewise contains other important amino acids that are helpful for men, females and kids.

% of Threonine in 100 gms: 112 %.

6. Parmesan Cheese

Parmesan is by far one of the world’s most popular varieties of cheese. The next time you have a takeaway pizza meal; do not feel as guilty as what you are eating is not all junk. Parmesan is known to have 125 % of the threonine RDI.

% of Threonine in 100 gms: 125 %.

7. Pork

Be it bacon, salami or pork chops, pork is an abundant source of threonine that is vital for growth and organ functions. Pork is known to consist of 132 % of the threonine RDI. This is known to be among the very best Threonine abundant foods and can be achieved by using Pork in a number of methods.

% of Threonine in 100 gms: 132 %.

8. Saltwater Fish

Here is another factor to take your household out to a seafood restaurant as saltwater fish that is abundant in Omega 3 fatty acids is also abundant sources of the amino acid threonine. Salmon is understood to include 122 % of the threonine RDI. It is likewise abundant in numerous healthy nutrients to promote healthy well-being.

% of Threonine in 100 gms: 122 %.

9. White Beans

White beans are an advantage for vegans aiming to supplement their threonine requires. Apart from its numerous health benefits, white beans are understood to consist of 39 % of the threonine RDI. If you don’t take in meat or eggs, white beans are a must on your plate.

% of Threonine in 100 gms: 39 %.

Now that you have seen this list of threonine abundant foods, it’s time to include them in your diet plan. Threonine is of utmost importance to the body and like other amino acids is a crucial element. A complex system such as the body needs a well-balanced diet plan to get in all the important nutrients. By including them to your everyday meal strategy, not just will you able to handle Threonine shortages, however also avoid lots of hazardous disorders. [5]


In biochemistry, the term amino acid is regularly used to refer specifically to alpha amino acids– those amino acids in which the amino and carboxylate groups are connected to the very same carbon, the so-called α– carbon (alpha carbon). The general structure of these alpha amino acids is:.






where R represents a side chain particular to each amino acid.

Most amino acids happen in two possible optical isomers, called D and L. The L amino acids represent the vast majority of amino acids found in proteins. They are called proteinogenic amino acids. As the name “proteinogenic” (literally, protein building) suggests, these amino acid are encoded by the basic hereditary code and participate in the procedure of protein synthesis.

With 2 chiral centers, threonine can exist in four possible stereoisomers, or two possible diastereomers (not mirror images) of L-threonine. Nevertheless, the name L-threonine is utilized for one single enantiomer, (2S, 3R) -2- amino-3-hydroxybutanoic acid. This is the only kind utilized in mammalian proteins. The second diastereomer (TWO, THREE), which is hardly ever present in nature, is called L-allo-threonine. Stereoisomers are particles whose atomic connection is the same however whose atomic arrangement in space is different. Enantiomers are stereoisomers that are nonsuperposable total mirror images of each other, much as one’s left and right hands are “the very same” but opposite.

Threonine has the chemical formula CH3-CH( OH)- CH( NH2)- COOH, or more usually, C4H9NO3.

Threonine, like serine, has a brief group ended with a hydroxyl group. The hydroxyl group connected makes it a polar amino acid. Its hydrogen is easy to get rid of, so threonine and serine typically act as hydrogen donors in enzymes. Nevertheless, while serine has a reputation as being involved in catalytic functions in enzymes, such as in trypsin and chymotrypsin, threonine’s function is this respect is not settled. Both threonine and serine are very hydrophilic, for that reason the outer regions of soluble proteins tend to be rich with them.

The threonine residue (component) is susceptible to various posttranslational modifications. The hydroxy side chain can go through O-linked glycosylation (addition of saccharides). In addition, threonine residues undergo phosphorylation (addition of phosphate) through the action of a threonine kinase. In its phosphorylated type, it can be referred to as phosphothreonine. [6]


As a necessary amino acid, threonine is not manufactured in people, and needs to be present in proteins in the diet. Adult humans need about 20 mg/kg body weight/day. In plants and bacteria, threonine is manufactured from aspartic acid via α-aspartyl-semialdehyde and homoserine. Homoserine undergoes O-phosphorylation; this phosphate ester goes through hydrolysis concomitant with relocation of the OH group. Enzymes associated with a normal biosynthesis of threonine include:.

  • aspartokinase
  • β-aspartate semialdehyde dehydrogenase
  • homoserine dehydrogenase
  • homoserine kinase
  • threonine synthase


Threonine is metabolized in at least three methods:.

In many animals it is converted to pyruvate via threonine dehydrogenase. An intermediate in this path can go through thiolysis with CoA to produce acetyl-CoA and glycine.

In humans the gene for threonine dehydrogenase is a non-active pseudogene, so threonine is transformed to α-ketobutyrate. The mechanism of the initial step is comparable to that catalyzed by serine dehydratase, and the serine and threonine dehydratase reactions are most likely catalyzed by the very same enzyme.

In lots of organisms it is O-phosphorylated by a kinase preparatory to more metabolism. This is particularly important in bacteria as part of the biosynthesis of cobalamin (Vitamin B12), as the item is transformed to (R) -1- aminopropan-2-ol for incorporation into the vitamin’s sidechain.

Threonine is utilized to synthesize glycine during the endogenous production of L-carnitine in the brain and liver of rats. [7]


1. Supports Digestive Health

Threonine safeguards the digestion system by producing a mucous gel layer that covers it and acts as a barrier to harmful gastrointestinal enzymes. This essential amino acid likewise supports healthy gut function by promoting the protective results of the gut mucus barrier.

According to research study released in Frontiers in Bioscience, a big percentage of dietary threonine is made use of for intestinal-mucosal protein synthesis. For this reason, taking in Thr foods may assist to enhance gut health under physiological and pathological conditions in both humans and animals.

2. Enhances Body Immune System

We require enough Thr to support appropriate immune function. The thymus gland uses the important amino acid to make T-cells, or T lymphocytes, that work to combat off infections inside the body.

Research published in Cold Spring Harbor Perspectives in Biology specifies that “serine/threonine kinases manage the epigenetic, transcriptional and metabolic programs that figure out T-cell function.” Scientists explain that at a fundamental level, serine and threonine kinases work as a series of on/off switches that set off antigen and cytokine receptors that make up the body immune system.

3. May Improve Muscle Contractions

Although more research is required to further comprehend its function, there is some proof that Thr might benefit signs of ALS, aka Lou Gehrig’s illness. Thr amino acid works to increase glycine levels in the main nervous system.

Glycine is used to deal with spasticity, which is why L-threonine has been evaluated for its capability to enhance spasticity, or contracting muscles, in ALS patients.

In an evaluation performed in Australia, researchers discovered that a double-blind, placebo-controlled research study of oral L-threonine to treat spine spasticity indicates a modest antispasmodic impact. Nevertheless, studies involving ALS clients reveal no improvements with L-thr treatment.

These blended reviews recommend that utilizing L-threonine supplements might help reduce contraction however might not work for ALS symptoms.

4. Supports Muscle and Bone Strength

Did you know that collagen and elastin proteins require threonine for correct production? You may already know that collagen is the most plentiful protein in the body, and it’s found in our muscles, bones, skin, blood vessels, tendons and digestive system.

Since Thr enables the production of collagen, it plays a crucial role in the health of your bones and muscles.

Research carried out Texas A&M University indicates that glycine from threonine, proline and hydroxyproline contributes to 57 percent of overall amino acids in collagen. Thr amino acid is a precursor to glycine, which is also used throughout the biosynthesis of creatine, providing muscles with a direct source of fuel to fix damage.

Threonine likewise permits appropriate elastin function. Elastin is a protein that’s discovered in connective tissue and lets the skin, tendons and ligaments resume shape after extending or contracting.

5. Assists Prevent Fatty Liver

Thr amino acid avoids fat accumulation in the liver. It does this by managing fat metabolism and assisting in lipotropic function.

Liptropic substances work to break down fat during metabolism, and without the amino acids threonine, methionine and aspartic acid, this wouldn’t be possible. Threonine deficiency can result in fatty liver and even liver failure.

An animal research study published in the American Journal of Physiology found that Thr-deficient diet plans increase mitochondrial uncoupling in the liver. This implies that diets doing not have quality protein foods that provide important amino acids can lead to cell breakdown and the accumulation of fats in the liver.

6. May Alleviate Stress And Anxiety and Mild Depression

Studies reveals that alternations in serum levels of amino acids, including serine and glycine, which need Thr for production, are linked to major anxiety. Researchers in Belgium discovered that modifications in levels of threonine, aspartate, asparagine and serine might forecast a client’s response to treatment with antidepressants by regulating amino acid levels in the body.

Due to the fact that Thr is a precursor to glycine, which helps calm nerves and support cognitive health, it’s typically utilized as a supplement to eliminate indications of stress and anxiety and depression. Glycine is also understood for its ability to assist enhance sleep, psychological efficiency, state of mind and memory.

7. Accelerates Wound Healing

Threonine is required for the proper production of collagen, which is needed for connective tissue formation and injury healing.

Research study shows that after experiencing burns or injury, individuals have higher urinary spill of threonine. This shows that the amino acid is metabolized from body tissues after an injury.

Increasing your intake of Thr through amino acid T foods or supplements may help speed healing of wounds, burns and other kinds of injury.

Deficiency Symptoms and Triggers

Threonine deficiency is uncommon, as many people get enough of the amino acid in the foods they eat. Nevertheless, individuals with an unbalanced diet plan, vegans and vegetarians, might not consume sufficient threonine foods, which can cause low levels of the amino acid.

Thr deficiency might trigger the following symptoms:.

  • gastrointestinal problems
  • irritation or psychological agitation
  • confusion
  • increased liver fat
  • bad nutrient absorption [8]

L-Threonine Supplements

The normal dosage is in between 100-500 mg per day. As much as 3 500 mg pills can be taken in one day if needed. Magnesium, vitamin B6 and niacin are also required along with the threonine in order to manufacture non-essential amino acids including serine and glycine. [9]

Negative effects

When taken by mouth: Threonine is LIKELY SAFE when utilized in food quantities. It’s been proposed that people need to get about 0.5 to 1 gram of threonine from their diet each day. This quantity is thought about to be safe. Threonine is POSSIBLY SAFE when used as a medication. Doses of as much as 4 grams of threonine daily have been utilized securely for approximately 12 months. Some individuals experience small adverse effects such as stomach upset, headache, queasiness, and skin rash.

Special Safety Measures and Cautions

When taken by mouth: Threonine is LIKELY SAFE when used in food quantities. It’s been proposed that individuals need to get about 0.5 to 1 gram of threonine from their diet per day. This quantity is considered to be safe. Threonine is potentially SAFE when used as a medication. Doses of as much as 4 grams of threonine daily have been used securely for as much as 12 months. Some individuals experience minor side effects such as indigestion, headache, queasiness, and skin rash. Pregnancy and breast-feeding: There isn’t adequate reliable details to know if threonine is safe to utilize when pregnant or breast-feeding. Remain on the safe side and avoid use.

Amyotrophic lateral sclerosis (Lou Gehrig’s disease): There is some concern that threonine might reduce lung function in patients with ALS. In one research study, ALS clients taking 1 gram of threonine 4 times each day for 6 months had substantially decreased lung function compared to clients who did not get threonine. More proof is required to identify if threonine was really at fault. [10]


Medications used for Alzheimer’s illness (NMDA antagonists) Interaction Rating: Major Do not take this combination.

There is some concern that threonine might decrease how well a medication utilized for Alzheimer’s disease works. This medication is called memantine (Namenda). [11]

The Bottom Line

Amino acids are crucial to your overall health and wellness. Without them, immunity reduces, gastrointestinal problems emerge, anxiety heightens, and more (.

Threonine, in particular, is a vital amino acid that plays a critical role in metabolizing crucial nutrients, preserving gut health, and promoting top quality sleep. Since threonine is an “essential” amino acid, it must be acquired from foods like pasture-raised chicken, almonds, and hemp seeds or a dietary supplement like grass-fed collagen powder.

Depending upon your age, gender, and state of health, threonine dosage can vary from 400 to over 1,000 milligrams. To ensure you’re taking in appropriate quantities of this essential amino acid, eat a whole food diet plan rich in protein and collagen. [12]
threonine thrē ´ ənēn [key], organic compound, one of the 22 α-amino acids frequently discovered in animal proteins. Only the l-stereoisomer appears in mammalian protein. It is one of several important amino acids needed in the diet plan; human beings can not manufacture it from easier metabolites. Young person need about 14 mg of this amino acid per day per kg (6 mg per lb) of body weight. Although threonine participates in many responses in germs, consisting of the biosynthesis of vitamin B12 and isoleucine, its metabolic role in higher animals, consisting of guy, remains odd. It is known only as a constituent of proteins, and even because form it is fairly unreactive. In spite of the truth that its side chain has a hydroxyl group similar to that of serine, there is no indication that it participates in the catalytic functions of any enzyme. Threonine was separated from the protein fibrin in 1935 and manufactured in the very same year. [13]


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