Protein Synthesis

Gene Expression and Protein Synthesis

Protein synthesis is the process by which genetic information encoded in DNA is converted into functional proteins. This involves tightly regulated stages of transcription and translation, allowing cells to control gene expression in response to physiological demands. Understanding protein synthesis is essential for linking molecular biology to normal cellular function and disease.

Transcription and Translation

The first stage, transcription, occurs in the nucleus where DNA is transcribed into messenger RNA (mRNA). The mRNA is then processed and transported to the cytoplasm, where translation takes place at the ribosome. During translation, amino acids are assembled into polypeptide chains according to the genetic code. These mechanisms underpin cell growth, repair, and metabolic regulation.

Protein Structure and Clinical Relevance

Once synthesised, proteins fold into complex three-dimensional structures that determine their function. This section explores primary, secondary, tertiary, and quaternary protein structure, and how structural alterations can lead to disease. A clear understanding of protein synthesis and structure is fundamental for studying genetics, pharmacology, and molecular pathology in clinical medicine.