Structural biology

Tiny parts make up all living things.

These parts have very special shapes. The shapes help them do their jobs. Scientists study these shapes to learn more.

In the past, tools were not very strong. Now, we use light and special beams. These tools show us how parts move.

Knowing these shapes helps us make medicine. It can help us fight many sicknesses. We can learn how to stay healthy.

Living things are made of tiny parts. These parts have special shapes. The shapes help them do their jobs. Scientists study these shapes. This field is called structural biology.

Long ago, scientists used simple tools. They used magnifying glasses and light microscopes. These tools could not see very small things. Now, we have much better ways. One way is X-ray crystallography. This uses X-rays to see the shape of molecules. It can even show tiny atoms. Another way is NMR spectroscopy. This helps us see how proteins move. We also use cryo-electron microscopy. This is a way to take very clear 3D pictures of proteins.

Knowing these shapes helps us fight sickness. Scientists study how parts work in diseases like Alzheimer's. This helps them make new medicines. They can design drugs to fit a specific shape. This is like finding the right key for a lock.

Computers now help too. They can predict what a shape will look like. This makes the work even faster.

Structural biology is a special way of studying the tiny parts of living things. Every living cell is made of many small pieces that have very specific shapes. These shapes are important because they help the pieces do their jobs. For example, proteins are made of amino acids and carry out most tasks in a cell. DNA is made of nucleotides, and membranes are made of lipids. These molecules must coil into certain 3D shapes to work correctly. This specific shape is called the tertiary structure.

Because these molecules are too small for light microscopes, scientists use clever methods. Most of these methods work by measuring many identical molecules at the same time. One way is X-ray crystallography, which uses X-rays to see shapes in atomic detail. Another way is NMR spectroscopy, which provides information about how proteins move. Scientists also use cryo-electron microscopy to take very clear 3D pictures. This method uses special electron sources to see individual proteins at a tiny scale called angstrom resolution.

People have been exploring these tiny worlds for a long time. In 1912, Max Von Laue used X-rays on copper sulfate to start a new way of seeing. In 1951, Rosalind Franklin and Maurice Wilkins used X-ray patterns to capture the first image of DNA. Later, Francis Crick and James Watson modeled the DNA double helix in 1953. Theodore Svedberg crystallized the first proteins, like pepsin, and won a Nobel Prize in 1962. In 1958, John Kendrew published the first tertiary protein structure of myoglobin.

Modern science uses many tools to understand these structures. In the 1930s and 1940s, Isidor Rabi, Felix Bloch, and Edward Mills Purcell helped develop NMR. In 1990, Richard Henderson used cryo-EM to make a high-resolution image of bacteriorhodopsin. Today, computers help by using molecular dynamics to simulate how molecules move. A new machine learning method called AlphaFold can even predict protein shapes. Scientists also use X-ray free electron lasers to watch how molecules move in real time.

Learning these shapes helps us solve big problems in health. Scientists use structural biology to study diseases like Alzheimer's and Parkinson's. They look at things called amyloid fibrils to understand how they cause sickness. This knowledge is a huge part of drug discovery. Researchers can find a target in a cell and then design a drug to fit it. It is a bit like making a key that fits a specific lock.

Structural biology is the study of the shapes of living matter. This matter is formed and maintained by living cells. It includes biological molecules like proteins, DNA, RNA, and membranes. These molecules are essential because they carry out most cell functions. To work, they must coil into very specific three-dimensional shapes. This complex architecture is known as the tertiary structure. The shape depends on the molecule's basic composition, called the primary structure.

Biomolecules are too small to see with standard light microscopes. Instead, scientists use methods that measure many identical molecules at once. One major method is X-ray crystallography. This technique uses X-rays to find the atomic detail of biological molecules. Another method is nuclear magnetic resonance, or NMR spectroscopy. NMR provides information about both the structure and the movement of proteins. A third method is cryo-electron microscopy, or cryo-EM. This technique uses coherent electron sources and special software to create 3D images. It can reach angstrom resolution, which is a very tiny scale of measurement.

Structural biology includes many different specialized techniques. Researchers use mass spectrometry to study these molecules. They also use neutron diffraction and proteolysis. Other tools include electron paramagnetic resonance (EPR) and electron crystallography. Some scientists use multiangle light scattering or small angle scattering. More advanced tools include ultrafast laser spectroscopy and circular dichroism. Scientists often study the "native states" of these molecules. This means they look at the molecules in their natural, functional forms. They also study how molecules change as they fold or unfold.

History shows how our view of the tiny world has changed. In 1912, Max Von Laue used X-rays on crystallized copper sulfate. This created a diffraction pattern and led to X-ray crystallography. In 1951, Rosalind Franklin and Maurice Wilkins captured the first DNA image. Using X-ray diffraction, Francis Crick and James Watson modeled the DNA double helix in 1953. They shared the Nobel Prize in 1962 with Wilkins. Theodore Svedberg crystallized the first proteins, such as pepsin. He also won a Nobel Prize in 1962. In 1958, John Kendrew published the first tertiary protein structure of myoglobin.

Technological advances have expanded what we can discover. In the late 1930s and 1940s, Isidor Rabi, Felix Bloch, and Edward Mills Purcell developed NMR. In 1990, Richard Henderson used cryo-EM to image bacteriorhodopsin at high resolution. Today, we use X-ray free electron lasers to watch molecules in motion. We also use computational methods like molecular dynamics (MD) simulations. These simulations help us study how proteins move and change shape. In 1975, the first MD simulation of protein folding was published in Nature. Recently, a machine learning method called AlphaFold has greatly improved protein structure prediction.

Understanding these structures is vital for medical science. Structural biology helps us understand the components of human diseases. For example, cryo-EM and solid-state NMR study amyloid fibrils. These fibrils are linked to Alzheimer's, Parkinson's, and type II diabetes. Scientists have also used cryo-EM to model tau filaments in Alzheimer's patients. This work may help create better treatments. Structural biology also explains how pathogens interact with hosts. For instance, it shows how the HIV envelope helps the virus hide from the immune system.

This field is a major part of the drug discovery process. Scientists use genomics to find specific targets in the body. Then, they use structural biology to study those targets. They use tools like ligand-NMR and mass spectrometry to develop drugs. The goal is to create drugs that fit the target perfectly. Researchers have used these methods on the Met protein to study cancer. They have also used them to find targets for treating AIDS. Scientists are even using structure-driven discovery to create new antimicrobials for mycobacterial infections.