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Carrier Proteins: Transport proteins that carry specific substances in the blood or across cell membranes.

Facilitated Transport

JoVE 10705

The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repel substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In the process of facilitated transport, also known as facilitated diffusion, molecules and ions travel across a membrane via two types of membrane transport proteins: channels and carrier proteins. These membrane transport proteins enable diffusion without requiring additional energy. Channel proteins form a hydrophilic pore through which charged molecules can pass through, thus avoiding the hydrophobic layer of the membrane. Channel proteins are specific for a given substance. For example, aquaporins are channel proteins that specifically facilitate the transport of water through the plasma membrane. Channel proteins are either always open or gated by some mechanism to control flow. Gated channels remain closed until a particular ion or substance binds to the channel, or some other mechanism occurs. Gated channels are found in the membranes of cells such as muscle cells and nerve cells. Muscle contractions occur when the relative concentrations of ions on the interior and

 Core: Membranes and Cellular Transport

Quantification of Protein Interaction Network Dynamics using Multiplexed Co-Immunoprecipitation

1Center for Integrative Brain Research, Seattle Children's Research Institute, 2Graduate Program in Neuroscience, University of Washington, 3Department of Cancer Immunology and Virology, Dana-Farber Cancer Institute, Department of Medicine, Harvard Medical School, 4Broad Institute of Harvard and MIT, 5Department of Mathematics, University of Houston, 6Department of Molecular Microbiology and Immunology, School of Medicine, University of Missouri, 7Department of Surgery, School of Medicine, University of Missouri, 8Department Bioengineering, College of Engineering, University of Missouri, 9Department of Pediatrics, University of Washington

JoVE 60029

 Biochemistry

Assessment of the Cytotoxic and Immunomodulatory Effects of Substances in Human Precision-cut Lung Slices

1Fraunhofer Institute for Toxicology and Experimental Medicine (ITEM), German Center for Lung Research (DZL), Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of REBIRTH Cluster of Excellence, 2Institute for Pathology, Hannover Medical School, German Center for Lung Research (DZL), Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), 3Division of Thoracic and Vascular Surgery, Klinikum Region Hannover (KRH), 4Department of Cardiothoracic, Transplantation and Vascular Surgery (HTTG), Hannover Medical School, German Center for Lung Research (DZL), Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), 5Institute of Pharmacology and Toxicology, RWTH Aachen University, 6Institute for Immunology, Hannover Medical School

JoVE 57042

 Immunology and Infection

Generation of Monoclonal Antibodies Against Natural Products

1School of Life Science, Beijing University of Chinese Medicine, 2Third Affiliated Hospital, Beijing University of Chinese Medicine, 3School of Basic Medical Sciences, Beijing University of Chinese Medicine, 4School of Chinese Materia Medica, Beijing University of Chinese Medicine, 5Center of Scientific Experiment, Beijing University of Chinese Medicine

JoVE 57116

 Immunology and Infection

Basophil Activation Test for Investigation of IgE-Mediated Mechanisms in Drug Hypersensitivity

1Department of Molecular Biology, University of Salzburg, 2Department of Neurology, Paracelsus Medical University, 3Department of Dermatology, Paracelsus Medical University, 4Bühlmann Laboratories, 5Christian Doppler Laboratory for Allergy Diagnosis and Therapy, University of Salzburg

JoVE 3263

 Immunology and Infection
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