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Lecture

Cell Membranes: Structure and Functions

In course

ENV-103: Biology

This course will cover the fundamental principles governing life and the living world. Topics will include the diversity of living organisms, cellular biology, genetics, evolution, and ecology. This course provides a foundation in biology, fostering critic ...

Description

This lecture covers the evolution of microscopy, cell wall structures of prokaryotes, membrane-associated proteins, and the functions of cell membranes. It explores topics such as passive and active transport, membrane permeability, and the role of integral and peripheral membrane proteins. The lecture delves into the mechanisms of metabolite transport, focusing on ABC carriers and the hydrolysis of ATP. It also discusses motility and chemotaxis in prokaryotic cells, including the different modes of movement and the importance of chemotaxis in directing cell motion towards or away from chemical signals. Additionally, it examines the concept of 'swarming' in bacterial colonies and the differentiation of morphology and growth rate based on colony position.

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Instructors (4)

Pierre Rossi

Anna Carratala Ripolles

During my PhD, I mainly focused on characterizing the effect of environmental factors (namely temperature and sunlight) and disinfectants on the stability of human viral pathogens as contaminants of aquatic environments. In addition,I developed a novel source tracking tool to identify avian fecal contamination in environmental samples. Thanks to a research fellowship given by the Spanish Ministry of Science and Technology, I also had the opportunity to explore the diversity of marine viruses in Mediterranean coastal waters by genetic fingerprinting and by next generation sequencing. Later on, I became interested in the long-term effect of environmental stressors on virus communities, so I joined the LCE as a postdoc to investigate the adaptation of enteroviruses to ultraviolet radiation. For 4 years, I worked on developing UV-resistant viruses and characterizing their acquired phenotypic and genetic properties by combining directed evolution experiments, deep sequencing and population genetics. Out of the lab, I am passionate about nature, traveling and scuba diving.

Julien Maillard

2011 - present: Research associate at the Laboratory for Environmental Biotechnology (LBE, IIE-ENAC, EPFL) 2007 - 2010: Postdoctoral Fellow at the Laboratory for Environmental Biotechnology (LBE, IIE-ENAC, EPFL) 2005 - 2006: Postdoctoral Fellow at the University of East Anglia (UEA, Norwich, UK) 2000 - 2004: PhD thesis at the Laboratory for Environmental Biotechnology (LBE) 1995 - 2000: B.sc & M.sc at the Swiss Federal Institute for Technology, Zurich (ETHZ)

Ianina Altshuler

Official source

Ontological neighbourhood

Biology

Cell biology: Membrane biology

Related concepts (32)

Cell membrane

The cell membrane (also known as the plasma membrane or cytoplasmic membrane, and historically referred to as the plasmalemma) is a biological membrane that separates and protects the interior of a cell from the outside environment (the extracellular space). The cell membrane consists of a lipid bilayer, made up of two layers of phospholipids with cholesterols (a lipid component) interspersed between them, maintaining appropriate membrane fluidity at various temperatures.

Membrane protein

Membrane proteins are common proteins that are part of, or interact with, biological membranes. Membrane proteins fall into several broad categories depending on their location. Integral membrane proteins are a permanent part of a cell membrane and can either penetrate the membrane (transmembrane) or associate with one or the other side of a membrane (integral monotopic). Peripheral membrane proteins are transiently associated with the cell membrane.

Membrane transport protein

A membrane transport protein (or simply transporter) is a membrane protein involved in the movement of ions, small molecules, and macromolecules, such as another protein, across a biological membrane. Transport proteins are integral transmembrane proteins; that is they exist permanently within and span the membrane across which they transport substances. The proteins may assist in the movement of substances by facilitated diffusion or active transport.

Active transport

In cellular biology, active transport is the movement of molecules or ions across a cell membrane from a region of lower concentration to a region of higher concentration—against the concentration gradient. Active transport requires cellular energy to achieve this movement. There are two types of active transport: primary active transport that uses adenosine triphosphate (ATP), and secondary active transport that uses an electrochemical gradient.

Integral membrane protein

An integral, or intrinsic, membrane protein (IMP) is a type of membrane protein that is permanently attached to the biological membrane. All transmembrane proteins are IMPs, but not all IMPs are transmembrane proteins. IMPs comprise a significant fraction of the proteins encoded in an organism's genome. Proteins that cross the membrane are surrounded by annular lipids, which are defined as lipids that are in direct contact with a membrane protein.

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