Amino Acid and Its Function

Amino acids are essential for our bodies to function correctly. These organic compounds are the "building blocks" of protein, creating and repairing tissues like muscles, bones, and skin.

Alongside the well-known proteins, other amino acids in the body contribute to a wide range of biological processes vital for staying healthy.

 

Meaning: What are amino acids?

Amino acids are organic compounds that combine to form proteins.

Think of individual amino acids as distinct building blocks linked in a chain. When linked together in various sequences, they create different proteins, each with a unique job to do.

This foundational role in forming proteins makes them indispensable.

From your muscles and skin to your enzymes and hormones, proteins are vital, and by extension, so are all the amino acids. They are truly fundamental to life as we know it.

 

Structure: What are amino acids made of?

Every amino acid shares a common molecular architecture. This basic structure consists of a central carbon atom bonded together to 4 different groups:

1. A basic amino group (-NH2), which contains nitrogen.


2. A carboxylic acid group (-COOH), which makes it an acid.


3. A hydrogen atom (-H).


4. A distinctive side chain, known as an R-group, which is the part that makes each amino acid different from the others.

The amino acid composition of a protein influences its structure and purpose within the body. It's the distinctive side chain that makes each amino acid unique.

The different chemical properties of the R-group determine how the amino acid will behave and how it will contribute to the final shape and function of a protein.

While the basics are always carbon, hydrogen, oxygen, and nitrogen, the variation in the side chain is what distinguishes the amino acids, both essential and nonessential amino acids.

 

What are essential amino acids?

The human body is an incredible system, able to produce many of the compounds it needs to function. However, there are certain amino acids it cannot produce on its own.

These are called essential amino acids. The term "essential" specifically means they must be obtained from external sources, namely through the food you eat.

There are 9 essential amino acids that your body requires to maintain health:

1. Histidine: An essential amino acid important for growth and tissue repair.


2. Isoleucine: Plays a key role in energy, amino acid metabolism, and muscle recovery.


3. Leucine: Known for its ability to support protein synthesis and muscle repair.


4. Lysine: Vital for calcium absorption, immune function, and collagen production.


5. Methionine: A sulphur-containing amino acid that aids in metabolism and detoxification.


6. Phenylalanine: Precursor to neurotransmitters, supporting brain function and mood.


7. Threonine: Helps maintain connective tissues and proper protein balance in the body.


8. Tryptophan: Essential for producing serotonin, which regulates mood and sleep.


9. Valine: Supports muscle growth, energy production, and tissue repair.

Without a consistent supply of these nine compounds from your diet, your body cannot build the complete proteins it needs to survive and thrive.

It also can’t efficiently manufacture certain conditional amino acids under stress or illness.

 

Function: What do amino acids do for the body?

Amino acids play a vital role in countless physiological tasks that keep your body running smoothly. Their functions are diverse and critical for your overall health.

• Building and repairing tissues: When you exercise, you create tiny tears in your muscle fibres. Amino acids are rushed to the site to repair this damage, making the muscle stronger.


• Nutrient transport and absorption: They ensure vitamins and minerals are delivered where they are needed most.


• Regulating mood and brain function: Some amino acids act as precursors to neurotransmitters, the chemical messengers that regulate your mood, sleep, and cognitive function.

 

Benefits: Why do we need amino acids?

A diet rich in these compounds is linked to improved vitality and performance in many areas of life. Key benefits include:

• Muscle Growth and Maintenance: Amino acids, particularly the branched-chain amino acids (BCAAs) like leucine, are crucial for stimulating muscle protein synthesis.


• Immune System Support: Your immune system relies on amino acids to produce antibodies and immune cells that fight off infections and illness.


• Improved Mood and Sleep: Amino acids like tryptophan are necessary for producing serotonin, a neurotransmitter that helps regulate mood, and melatonin, the hormone that controls your sleep-wake cycle.


• Enhanced Energy and Vitality: They play a part in energy production and can help reduce fatigue, keeping you feeling energised throughout the day. Glutamic acid and aspartic acid also support cognitive function and the body's energy needs.

Some amino acids are classified as conditionally essential amino acids—typically nonessential but required in greater amounts during times of stress, illness, or rapid growth.

 

What foods contain amino acids?

Meeting your daily amino acid requirements is achievable through a balanced diet. Complete proteins, which contain all nine essential amino acids, are found in various foods. Identifying these sources is the first step to building a diet that supports your body's needs. Excellent sources of amino acids include:

• Animal-Based Products: Meat (such as beef and poultry), fish, eggs, and dairy products (like milk, cheese, and yoghurt) are all complete protein sources rich in both essential and non-essential amino acids.


• Plant-Based Options: For those following a vegetarian or vegan diet, many plants offer a great supply. Soy products like tofu and edamame, quinoa, and buckwheat are complete proteins. Other legumes, nuts, seeds, and whole grains are also fantastic sources, and combining them (like rice and beans) can ensure you get all nine essential amino acids.

If you find it difficult to meet your protein needs from food alone, amino acid supplements can play a role in supporting your nutrition and active lifestyle.

 

Enhance Your Nutritional Wellness with Ajinomoto Malaysia

 

At Ajinomoto (Malaysia) Berhad, we lead the food and biotechnology industries with our unique "Amino Science" philosophy.

Our goal is to address global food and health challenges while enhancing quality of life through the power of amino acids.

By 2031, we aim to solve critical food and health issues through amino acid-based innovations.

Our dedication to research and development is reflected in a wide range of products designed to meet modern nutritional needs:

• Performance Nutrition: The aminoVITAL® line applies amino acid research to support active lifestyles. The "Red Shot" Apple Jelly Drink uses BCAAs and Arginine to boost muscle endurance and speed up recovery. For a quick energy solution, the portable aminoVITAL® SHOT apple-flavoured gel delivers 110 kcal to maintain performance during physical activity.


• AminoScience Education: We also champion STEM advancement through initiatives like Science Castle. By partnering with organizations like Leave a Nest Malaysia, we support young researchers and promote the application of amino science to solve real-world problems.