Protein Biosynthesis: How Cells Build Proteins
Protein biosynthesis is the cellular process by which proteins are produced based on genetic information. It involves transcription and translation.
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Protein biosynthesis is the cellular process by which proteins are produced based on genetic information. It involves transcription and translation.
What is Protein Biosynthesis?
Protein biosynthesis – also referred to as protein synthesis – is a fundamental biological process by which living cells produce proteins. Proteins are essential for virtually all bodily functions: they act as enzymes, structural molecules, hormones, antibodies, and transport molecules. Protein biosynthesis takes place in every cell of the human body and is governed by the genetic information stored in the cell nucleus.
Steps of Protein Biosynthesis
Protein biosynthesis consists of two main phases:
1. Transcription
In the first step, the genetic information encoded in DNA (deoxyribonucleic acid) within the cell nucleus is copied into a messenger RNA (mRNA) molecule. This process is called transcription. The enzyme RNA polymerase reads the relevant section of the DNA (a gene) and synthesises a complementary mRNA strand. The completed mRNA then leaves the nucleus and travels into the cytoplasm of the cell.
2. Translation
In the second step, the mRNA message is decoded at the ribosomes – the protein factories of the cell – and converted into a sequence of amino acids. This process is called translation. Ribosomes read the mRNA in triplets known as codons, each of which corresponds to a specific amino acid. Transfer RNA (tRNA) molecules carry the appropriate amino acids to the ribosome, where they are linked together into a chain. This amino acid chain then folds into a functional, three-dimensional protein.
Regulation of Protein Biosynthesis
Protein biosynthesis is a tightly regulated process. Not all genes are read at the same time or at the same rate. Gene activity is influenced by a variety of factors, including:
- Hormones (e.g., growth hormone, insulin)
- Nutrient availability (e.g., sufficient amino acid supply)
- Cell signalling molecules and growth factors
- Epigenetic modifications (chemical changes to DNA that do not alter the underlying sequence)
Importance for the Human Body
Without functional protein biosynthesis, life would not be possible. It is responsible for:
- Building and renewing tissue (e.g., muscles, skin, organs)
- Producing enzymes that catalyse metabolic reactions
- Generating antibodies as part of the immune response
- Synthesising hormones such as insulin and growth hormone
- Transporting oxygen throughout the body via haemoglobin in red blood cells
Disorders of Protein Biosynthesis
Errors or disruptions in protein biosynthesis can have serious consequences. Common causes include:
- Gene mutations: Changes in the DNA sequence lead to faulty or non-functional proteins. Examples include hereditary diseases such as cystic fibrosis and sickle cell anaemia.
- Malnutrition: A deficiency of essential amino acids limits protein synthesis, as the body cannot produce these amino acids on its own.
- Viral infections: Viruses hijack the host cell protein biosynthesis machinery to produce their own proteins and replicate.
- Antibiotics: Many antibiotics specifically inhibit bacterial protein biosynthesis (e.g., tetracyclines, macrolides) without significantly affecting human protein synthesis.
Protein Biosynthesis and Nutrition
An adequate intake of proteins and essential amino acids through diet is crucial for optimal protein biosynthesis. Essential amino acids – including leucine, isoleucine, valine, lysine, and tryptophan – cannot be synthesised by the human body and must therefore be obtained from food. Good dietary sources include animal products (meat, fish, eggs, dairy) as well as plant-based foods such as legumes, nuts, and whole grains.
References
- Alberts B. et al. - Molecular Biology of the Cell. 6th Edition. W.W. Norton and Company, 2014.
- Berg JM, Tymoczko JL, Stryer L. - Biochemistry. 8th Edition. W.H. Freeman and Company, 2015.
- World Health Organization (WHO) - Protein and Amino Acid Requirements in Human Nutrition. WHO Technical Report Series, No. 935, 2007. Available at: https://www.who.int
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