Cholesterol Binding
Cholesterol Binding - Related Videos
11:07
Macrophage Cholesterol Depletion and Its Effect on the Phagocytosis of Cryptococcus neoformans
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Cited by 22 •
2014
In this article, a protocol for infection of macrophages with Cryptococcus neoformans is described. Also, a method for sterol depletion from the macrophages is explained. These protocols provide a guide to study fungal infections in vitro and examine the role of sterols in such infections.
01:29
Cholesterol: Significance and Regulation
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2024
Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces. Considering cholesterol and...
07:54
Cholesterol Efflux Assay
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Cited by 74 •
2012
The cholesterol assay is designed to quantitate the rate of cholesterol efflux from cultured cells and the capacity of plasma acceptors to accept cholesterol released from cells. The assay consists of labelling cells with cholesterol, equilibration of cholesterol among intracellular pools and release of cholesterol to an extracellular acceptor.
02:18
The Equilibrium Binding Constant and Binding Strength
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2020
The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium: where P and L are the unbound protein and ligand, respectively, and PL is the protein-ligand complex. As the amount of bound ligand is also related to the rate of ligand binding, experiments can also determine Kb by examining the rates of protein-ligand association (kon) and dissociation (koff) using the following ratio: Thus,...
10:12
Enrichment of Mammalian Tissues and Xenopus Oocytes with Cholesterol
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Cited by 12 •
2020
Two methods of cholesterol enrichment are presented: the application of cyclodextrin saturated with cholesterol to enrich mammalian tissues and cells, and the use of cholesterol-enriched phospholipid-based dispersions (liposomes) to enrich Xenopus oocytes. These methods are instrumental for determining the impact of elevated cholesterol levels in molecular, cellular, and organ function.
FAQs
Hydrophobic contacts favor association because cholesterol contains a largely nonpolar sterol structure, while van der Waals forces provide close-range attraction between complementary molecular surfaces. Together, these noncovalent interactions can stabilize cholesterol within a binding pocket or among neighboring lipids without creating a permanent chemical linkage. Their combined strength helps determine whether the association remains reversible.
A binding site or lipid environment must accommodate cholesterol’s molecular shape and chemical features for effective association. Sterol-binding pockets can therefore differ in how strongly or selectively they recognize cholesterol. Changes in the surrounding chemical environment may also alter these interactions, helping explain why binding strength and specificity vary among proteins, lipids, and other molecular partners.
Reversible association allows cholesterol to move between interacting partners rather than remaining permanently attached to one molecule. This property supports dynamic control of membrane organization and lipid metabolism, because cholesterol can associate with proteins or lipids when needed and later dissociate or become available for transport, sequestration, or removal. The balance of these interactions influences cellular cholesterol handling.
Cholesterol binding can influence the molecular environment surrounding membrane proteins and contribute to overall membrane organization. When cholesterol associates with a protein or nearby lipids, it may alter how the protein is positioned within the membrane or how its local environment is arranged. Studying these associations therefore helps connect sterol recognition with membrane-protein behavior in biochemistry.
Biochemical studies can evaluate how strongly and selectively cholesterol associates with proteins, lipids, or other molecules. Interpreting these interactions in relation to molecular shape, chemical environment, and membrane composition helps identify factors that control binding. The resulting information can clarify cholesterol transport and regulation, as well as the molecular basis of membrane organization.
The topic is especially relevant when researchers examine how cells transport cholesterol, regulate its availability, or respond to excess sterol. Binding interactions provide a molecular link between cholesterol and the proteins or lipid environments that control its handling. This perspective helps organize questions about where cholesterol is maintained, redistributed, sequestered, or removed during lipid metabolism.
Abnormal cholesterol handling can make binding interactions important targets for disease research. Examining how cholesterol associates with regulatory proteins, membrane components, or sequestration systems may identify cholesterol-dependent pathways that change under pathological conditions. These findings can support therapeutic design by focusing attention on molecular interactions that influence cholesterol transport, regulation, sequestration, or removal.
Cholesterol binding connects molecular interactions with broader cellular processes, including membrane organization, lipid metabolism, transport, and sterol removal. It also provides a framework for comparing associations with proteins, lipids, and other molecules through their noncovalent forces, shape, and chemical context. Consequently, the concept supports both mechanistic biochemical analysis and applied research on cholesterol-dependent pathways.