Lecture

Exploring Proteins: Structure, Purification, and Analysis

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In course

CH-210: Biochemistry

Les constituants biochimiques de l'organisme, protéines, glucides, lipides, à la lumière de l'évolution des concepts et des progrès en biologie moléculaire et génétique, sont étudiés. ...

Description

This lecture introduces the exploration of proteins and proteomes, covering topics such as protein synthesis, composition, structure, and diversity. It delves into protein purification methods like ion exchange chromatography and gel-filtration chromatography, as well as techniques for protein analysis including mass spectrometry and electrophoresis. The lecture also discusses protein sequencing, concentration measurement, and the use of antibodies for protein detection. Furthermore, it explains the three-dimensional structure determination of proteins through x-ray crystallography and highlights the importance of isoelectric focusing and high-pressure liquid chromatography in protein analysis.

Instructor

Christian Heinis

Teaching & PhD PhD Students Thomas Julien Denis Emel, Alessandro Scapozza, Nathan Moïse De Sadeleer, Florian Handel, Hugo André Clerc, Frédéric Brantschen, Grégoire Menoud, Ines Michrafy, Jonathan Schmitt, Laura Elena Massaad Past EPFL PhD Students Jeremy Touati, Shiyu Chen, Sophie Venet-Bonnot, Lisa Pollaro, Inmaculada Rentero Rebollo, Philippe Diderich, Charlotte Urech-Varenne, Silvia Bellotto, Davide Bertoldo, Alessandro Zorzi, Camille Villequey, Jonas Alfred Karl Wilbs, Grigory Karateev, Vanessa Carle

Official source

Related concepts (32)

Chromatography

In chemical analysis, chromatography is a laboratory technique for the separation of a mixture into its components. The mixture is dissolved in a fluid solvent (gas or liquid) called the mobile phase, which carries it through a system (a column, a capillary tube, a plate, or a sheet) on which a material called the stationary phase is fixed. Because the different constituents of the mixture tend to have different affinities for the stationary phase and are retained for different lengths of time depending on their interactions with its surface sites, the constituents travel at different apparent velocities in the mobile fluid, causing them to separate.

High-performance liquid chromatography

High-performance liquid chromatography (HPLC), formerly referred to as high-pressure liquid chromatography, is a technique in analytical chemistry used to separate, identify, and quantify each component in a mixture. It relies on pumps to pass a pressurized liquid solvent containing the sample mixture through a column filled with a solid adsorbent material. Each component in the sample interacts slightly differently with the adsorbent material, causing different flow rates for the different components and leading to the separation of the components as they flow out of the column.

Protein structure

Protein structure is the three-dimensional arrangement of atoms in an amino acid-chain molecule. Proteins are polymers - specifically polypeptides - formed from sequences of amino acids, which are the monomers of the polymer. A single amino acid monomer may also be called a residue, which indicates a repeating unit of a polymer. Proteins form by amino acids undergoing condensation reactions, in which the amino acids lose one water molecule per reaction in order to attach to one another with a peptide bond.

Protein tertiary structure

Protein tertiary structure is the three dimensional shape of a protein. The tertiary structure will have a single polypeptide chain "backbone" with one or more protein secondary structures, the protein domains. Amino acid side chains may interact and bond in a number of ways. The interactions and bonds of side chains within a particular protein determine its tertiary structure. The protein tertiary structure is defined by its atomic coordinates. These coordinates may refer either to a protein domain or to the entire tertiary structure.

Liquid chromatography–mass spectrometry

Liquid chromatography–mass spectrometry (LC–MS) is an analytical chemistry technique that combines the physical separation capabilities of liquid chromatography (or HPLC) with the mass analysis capabilities of mass spectrometry (MS). Coupled chromatography - MS systems are popular in chemical analysis because the individual capabilities of each technique are enhanced synergistically. While liquid chromatography separates mixtures with multiple components, mass spectrometry provides spectral information that may help to identify (or confirm the suspected identity of) each separated component.

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