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L-threonine is a necessary amino acid in people, indicating that it can not be manufactured 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 one of the 20 typical proteinogenic amino acids for people, which are utilized to construct proteins. It is also a polar amino acid and one of the two proteinogenic amino acids which contain alcohol groups. The American nutritionist William Cumming Rose discovered threonine throughout the 1930s, making it the last of the typical proteinogenic amino acids to be found.

Threonine can be prepared in the laboratory by responding mercury acetate with crotonic acid. This treatment yields a racemic mix of threonine, meaning that it produces both D-threonine and L-threonine. However, only L-threonine is biologically active for humans. Lots of plants and some microbes can synthesize L-threonine by using homoserine and alpha-aspartyl-semialdehyde to produce aspartic acid. Aspartic acid can then be lowered to yield L-threonine. [2]

Mechanism of action

L-Threonine is a precursor to the amino acids glycine and serine. It acts as a lipotropic in controlling fat build-up in the liver. Might help combat mental illness and may be extremely useful in indigestion and digestive tract breakdowns. Also, threonine avoids excessive liver fat. Nutrients are more readily soaked up when threonine exists. [3]


L-Threonine promotes typical development by assisting to preserve the appropriate protein balance in the body. L-Threonine also supports cardiovascular, liver, central nervous, and immune system function. Threonine is needed to create glycine and serine, two amino acids that are required 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 significant amounts. It likewise assists develop strong bones and tooth enamel, and might speed injury healing or recovery from injury. Threonine combines with the amino acids aspartic acid and methionine to assist the liver with lipotropic function, or the digestion of fats and fats. Without enough threonine in the body, fats might build up in the liver and eventually trigger liver failure. Threonine supports the body immune system by helping in the production of antibodies. [4]

Food Sources

1. Turkey

A lump of protein-rich meat such as turkey is understood to adequately supplement the body with threonine. In fact, it is commonly credited to be among the richest 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 happen to be a male or 72 % your consumption needs if you take place to be a lady.

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

2. Egg White Powder

With no hydrogenated fats or cholesterol, egg whites powder can be an outstanding source of threonine. One can utilize egg white powder whilst baking as a two-tablespoon serving is understood to include 513 milligrams of threonine. This is 30 % of a male’s day-to-day threonine requirements and 34 % of what a woman needs daily.

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 consist of 3,000 milligrams of threonine. This is far above the day-to-day requirement of both males and females. Soy flour, soy milk, tofu and soy nuggets can also be added to our diet plan to supplement our threonine needs.

% of Threonine in 100 gms: 22 %.

4. Lean Beef

Lean beef is understood to be an abundant source of threonine largely depending on how it is prepared. The top loin of beef filet without bones when grilled is known to contain 2142 milligrams of threonine that makes beef a protein source par excellence for males, females and children.

% of Threonine in 100 gms: 134 %.

5. Chicken Breast

While chicken is prevalent meat in our everyday diets, we are hardly aware that it is abundant in threonine. One entire cooked chicken is known to consist of 137 % of threonine RDI. It also consists of other important amino acids that are beneficial for males, women and kids.

% of Threonine in 100 gms: 112 %.

6. Parmesan Cheese

Parmesan is without a doubt among 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 consuming is not all scrap. 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 a rich source of threonine that is vital for development and organ functions. Pork is understood to include 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 variety of methods.

% of Threonine in 100 gms: 132 %.

8. Saltwater Fish

Here is another reason to take your family out to a seafood dining establishment as saltwater fish that is abundant in Omega 3 fatty acids is also abundant sources of the amino acid threonine. Salmon is understood to contain 122 % of the threonine RDI. It is likewise rich in many healthy nutrients to promote healthy wellness.

% of Threonine in 100 gms: 122 %.

9. White Beans

White beans are a benefit for vegans wanting to supplement their threonine requires. Apart from its numerous health benefits, white beans are known to include 39 % of the threonine RDI. If you do not consume meat or eggs, white beans are a must on your plate.

% of Threonine in 100 gms: 39 %.

Now that you have actually seen this list of threonine rich foods, it’s time to include them in your diet. Threonine is of utmost value to the body and like other amino acids is a crucial element. A complex system such as the body needs a healthy diet plan to get in all the important nutrients. By adding them to your day-to-day meal plan, not just will you able to handle Threonine shortages, however likewise prevent numerous harmful conditions. [5]


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






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

Many amino acids occur in 2 possible optical isomers, called D and L. The L amino acids represent the vast bulk of amino acids discovered in proteins. They are called proteinogenic amino acids. As the name “proteinogenic” (literally, protein structure) suggests, these amino acid are encoded by the basic hereditary code and participate in the process of protein synthesis.

With two chiral centers, threonine can exist in 4 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 form used in mammalian proteins. The second diastereomer (TWO, 3S), which is rarely present in nature, is called L-allo-threonine. Stereoisomers are particles whose atomic connection is the same however whose atomic plan in space is various. 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 normally, C4H9NO3.

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

The threonine residue (element) is prone to numerous posttranslational modifications. The hydroxy side chain can go through O-linked glycosylation (addition of saccharides). In addition, threonine residues go through phosphorylation (addition of phosphate) through the action of a threonine kinase. In its phosphorylated form, it can be described as phosphothreonine. [6]


As a vital amino acid, threonine is not synthesized in human beings, and needs to be present in proteins in the diet. Adult humans require about 20 mg/kg body weight/day. In plants and microorganisms, threonine is manufactured from aspartic acid by means of α-aspartyl-semialdehyde and homoserine. Homoserine goes through O-phosphorylation; this phosphate ester goes through hydrolysis concomitant with relocation of the OH group. Enzymes involved in a normal biosynthesis of threonine consist of:.

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


Threonine is metabolized in at least three ways:.

In lots of animals it is transformed to pyruvate via threonine dehydrogenase. An intermediate in this pathway can go through thiolysis with CoA to produce acetyl-CoA and glycine.

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

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

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


1. Supports Digestive Health

Threonine protects the gastrointestinal system by producing a mucous gel layer that covers it and serves as a barrier to damaging digestive enzymes. This crucial amino acid likewise supports healthy gut function by promoting the protective impacts of the gut mucus barrier.

According to research study published 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 might help to enhance gut health under physiological and pathological conditions in both human beings and animals.

2. Boosts Body Immune System

We need enough Thr to support correct immune function. The thymus gland utilizes the important amino acid to make T-cells, or T lymphocytes, that work to fight off infections inside the body.

Research released in Cold Spring Harbor Perspectives in Biology specifies that “serine/threonine kinases control the epigenetic, transcriptional and metabolic programs that identify T-cell function.” Researchers describe that at a basic level, serine and threonine kinases work as a series of on/off switches that activate antigen and cytokine receptors that comprise the body immune system.

3. Might Improve Muscle Contractions

Although more research study is needed to further comprehend its role, there is some evidence that Thr might benefit symptoms of ALS, aka Lou Gehrig’s disease. Thr amino acid works to increase glycine levels in the main nervous system.

Glycine is utilized to treat spasticity, which is why L-threonine has been assessed for its ability to enhance spasticity, or contracting muscles, in ALS patients.

In a review performed in Australia, researchers found that a double-blind, placebo-controlled research study of oral L-threonine to deal with spine spasticity shows a modest antispasmodic result. Nevertheless, studies including ALS clients show no enhancements with L-thr treatment.

These blended reviews suggest that using L-threonine supplements may help reduce contraction however might not work for ALS symptoms.

4. Supports Muscle and Bone Strength

Did you understand that collagen and elastin proteins need threonine for proper production? You may currently understand that collagen is the most abundant protein in the body, and it’s discovered in our muscles, bones, skin, blood vessels, tendons and gastrointestinal system.

Because Thr enables the production of collagen, it plays a vital function in the health of your bones and muscles.

Research performed Texas A&M University shows 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 during the biosynthesis of creatine, offering muscles with a direct source of fuel to fix damage.

Threonine likewise enables proper 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. Helps Prevent Fatty Liver

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

Liptropic compounds work to break down fat during metabolism, and without the amino acids threonine, methionine and aspartic acid, this wouldn’t be possible. Threonine shortage 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 indicates that diet plans doing not have quality protein foods that provide necessary amino acids can result in cell breakdown and the accumulation of fats in the liver.

6. Might Alleviate Stress And Anxiety and Mild Depression

Studies reveals that alternations in serum levels of amino acids, including serine and glycine, which require Thr for production, are connected to significant anxiety. Scientists in Belgium found that modifications in levels of threonine, aspartate, asparagine and serine might forecast a client’s reaction to treatment with antidepressants by modulating amino acid levels in the body.

Because Thr is a precursor to glycine, which assists calm nerves and assistance cognitive health, it’s often used as a supplement to eliminate indications of anxiety and depression. Glycine is likewise understood for its ability to help enhance sleep, mental performance, state of mind and memory.

7. Accelerates Injury Recovery

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

Research shows that after experiencing burns or trauma, 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 might assist speed healing of wounds, burns and other forms of injury.

Shortage Symptoms and Causes

Threonine deficiency is uncommon, as many people get enough of the amino acid in the foods they eat. However, people with an out of balance diet plan, vegans and vegetarians, may not consume sufficient threonine foods, which can trigger low levels of the amino acid.

Thr shortage might cause the following signs:.

  • digestion problems
  • irritation or psychological agitation
  • confusion
  • increased liver fat
  • poor nutrient absorption [8]

L-Threonine Supplements

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

Side Effects

When taken by mouth: Threonine is LIKELY SAFE when utilized in food amounts. It’s been proposed that people require to get about 0.5 to 1 gram of threonine from their diet each day. This amount is considered to be safe. Threonine is POSSIBLY SAFE when used as a medicine. Doses of up to 4 grams of threonine daily have actually been utilized safely for approximately 12 months. Some individuals experience small negative effects such as indigestion, headache, queasiness, and skin rash.

Special Preventative Measures and Cautions

When taken by mouth: Threonine is LIKELY SAFE when utilized in food quantities. It’s been proposed that people require to get about 0.5 to 1 gram of threonine from their diet plan per day. This quantity is thought about to be safe. Threonine is perhaps SAFE when used as a medication. Dosages of up to 4 grams of threonine daily have been utilized safely for approximately 12 months. Some people experience minor side effects such as stomach upset, headache, queasiness, and skin rash. Pregnancy and breast-feeding: There isn’t adequate trusted info to understand if threonine is safe to utilize when pregnant or breast-feeding. Stay on the safe side and avoid use.

Amyotrophic lateral sclerosis (Lou Gehrig’s illness): There is some issue that threonine may reduce lung function in patients with ALS. In one research study, ALS patients taking 1 gram of threonine four times per day for 6 months had substantially minimized lung function compared to patients who did not get threonine. More proof is required to figure out if threonine was really at fault. [10]


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

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

The Bottom Line

Amino acids are vital to your general health and wellbeing. Without them, resistance decreases, gastrointestinal problems occur, anxiety increases, and more (.

Threonine, in particular, is a vital amino acid that plays an essential role in metabolizing key nutrients, keeping gut health, and promoting top quality sleep. Due to the fact that threonine is an “necessary” amino acid, it needs to be acquired from foods like pasture-raised chicken, almonds, and hemp seeds or a dietary supplement like grass-fed collagen powder.

Depending on your age, gender, and state of health, threonine dose can vary from 400 to over 1,000 milligrams. To guarantee you’re taking in adequate quantities of this essential amino acid, consume a whole food diet plan abundant in protein and collagen. [12]
threonine thrē ´ ənēn [crucial], natural compound, one of the 22 α-amino acids typically found in animal proteins. Just the l-stereoisomer appears in mammalian protein. It is one of several essential amino acids required in the diet; people can not manufacture it from easier metabolites. Young person require about 14 mg of this amino acid daily per kg (6 mg per pound) of body weight. Although threonine takes part in lots of reactions in germs, including the biosynthesis of vitamin B12 and isoleucine, its metabolic function in higher animals, consisting of male, remains odd. It is known only as a constituent of proteins, and even because form it is relatively unreactive. In spite of the fact that its side chain has a hydroxyl group comparable to that of serine, there is no sign that it takes part in the catalytic functions of any enzyme. Threonine was isolated from the protein fibrin in 1935 and manufactured in the same year. [13]


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