Peripheral Proteins
Peripheral Proteins - Related Videos
08:24
Nitrogen Cavitation and Differential Centrifugation Allows for Monitoring the Distribution of Peripheral Membrane Proteins in Cultured Cells
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Cited by 15 •
2017
Here we present protocols for detergent-free homogenization of cultured mammalian cells based on nitrogen cavitation and subsequent separation of cytosolic and membrane-bound proteins by ultracentrifugation. This method is ideal for monitoring the partitioning of peripheral membrane proteins between soluble and membrane fractions.
11:11
Determination of Plasma Membrane Partitioning for Peripherally-associated Proteins
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Cited by 5 •
2018
Here, we present a protocol to perform a quantitative analysis of the level of plasma-membrane association for fluorescently-tagged peripherally-associated protein. The method is based on the computational decomposition of membrane and cytoplasmic component of signal observed in cells labeled with plasma membrane fluorescent marker.
07:51
Peripheral Venous Cannulation
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2023
Source: Sharon Bord, MD, Department of Emergency Medicine, The Johns Hopkins University School of Medicine, Maryland, USA Placement of an intravenous (IV) catheter is one of the key procedures in medicine. The IV catheter allows patients to receive critical medications, including pain medicine, insulin, antibiotics, blood products, and fluids for rehydration. Additionally, placing an IV catheter allows for blood samples to be obtained, which can be sent to the laboratory for testing and...
09:32
Bioluminescence Imaging of Neuroinflammation in Transgenic Mice After Peripheral Inoculation of Alpha-Synuclein Fibrils
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Cited by 1 •
2017
Peripheral injection of alpha-synuclein fibrils into the peritoneum or tongue of Tg(M83+/-:Gfap-luc+/-) mice, which express human alpha-synuclein with the familial A53T mutation and firefly luciferase, can induce neuropathology, including neuroinflammation, in their central nervous system.
11:39
Peripheral Intravenous Catheter Insertion
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2023
Source: Madeline Lassche, MSNEd, RN and Katie Baraki, MSN, RN, College of Nursing, University of Utah, UT The purpose of peripheral intravenous catheter (PIV) insertion is to infuse medications, perform intravenous (IV) fluid therapy, or inject radioactive tracers for special examination procedures. Placing a PIV is an invasive procedure and requires the use of an aseptic, no-touch technique. Common IV venipuncture sites are the arms and hands in adults and the feet in children. According to...
FAQs
Electrostatic interactions, hydrogen bonds, and contacts with integral membrane proteins provide the main attachment mechanisms. These interactions let a peripheral protein associate with either membrane surface while avoiding the bilayer’s hydrophobic core. Because these contacts are reversible, the protein can participate in membrane organization without becoming a permanent structural component of the lipid bilayer.
Reversible association allows cells to assemble and remodel membrane-associated signaling complexes rapidly. A protein can join a membrane surface when its organizing or regulatory role is needed and later detach as the complex changes. This flexibility connects membrane structure with signal transduction and helps explain why peripheral proteins are useful regulators rather than fixed components of membrane architecture.
Unlike integral membrane proteins, peripheral proteins do not span the bilayer’s hydrophobic core. Their surface-based attachment can be examined through changes in ionic strength or pH, while integral proteins are characterized by their membrane-spanning placement. This distinction helps researchers separate reversible surface association from the more stable organization created by proteins embedded across the bilayer.
Ionic strength and pH are key variables for testing peripheral protein attachment. Altering either condition can promote release without disrupting the lipid bilayer. Consequently, experiments that vary these conditions can assess how strongly a protein associates with the membrane surface and whether its association is reversible, providing insight into the forces organizing membrane-associated complexes.
A basic investigation changes the ionic strength or pH around a membrane preparation and checks whether the associated protein is released. If release occurs without disruption of the lipid bilayer, the result supports reversible peripheral attachment. This procedure helps distinguish surface-associated proteins from membrane components whose placement requires spanning the bilayer’s hydrophobic core.
Peripheral proteins contribute to signal transduction, cytoskeletal anchoring, membrane trafficking, and regulation of transport or enzymatic activity. Their reversible behavior makes them relevant to studies of membrane structure and cell communication, while altered peripheral-protein function can also be considered in research on disease-related dysfunction. These roles connect membrane organization with broader cellular regulation.