Calcium Chelation
Calcium Chelation - Related Videos
08:43
Calcium Imaging in Neurons
0 Views •
2023
Calcium ions play an integral role in neuron function: They act as intracellular signals that can elicit responses such as altered gene expression and neurotransmitter release from synaptic vesicles. Within the cell, calcium concentration is highly dynamic due to the presence of pumps that selectively transport these ions in response to a variety of signals. Calcium imaging takes advantage of intracellular calcium flux to directly visualize calcium signaling in living neurons.This video begins...
03:22
Calcium-Dependent Hydrophobic Interaction Chromatography: A Technique to Purify Calcium-Binding Proteins Based on Hydrophobic Interactions
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2025
In this video, we demonstrate the purification of calcium-binding protein from a dialyzed cell lysate through calcium-dependent hydrophobic interaction chromatography. The calcium-binding proteins expose a hydrophobic region upon binding with calcium, facilitating interaction with a hydrophobic group on resin. Later these proteins are eluted using calcium chelator EDTA that reverses the interaction.
01:19
Complexation Equilibria: The Chelate Effect
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2024
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
15:29
Whole-Cell Recording of Calcium Release-Activated Calcium (CRAC) Currents in Human T Lymphocytes
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Cited by 5 •
2010
We provide a step-by-step protocol for whole-cell patch clamp recording of Calcium Release-Activated Calcium (CRAC) currents in peripheral blood mononuclear cell-derived human T lymphocytes.
09:51
Monitoring Changes in the Intracellular Calcium Concentration and Synaptic Efficacy in the Mollusc Aplysia
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Cited by 4 •
2012
We demonstrate how changes in the intracellular free calcium concentration and synaptic efficacy can be simultaneously monitored in a ganglion preparation of Aplysia. We image intracellular calcium using a fluorescent dye, Calcium Orange, and induce and monitor synaptic transmission with sharp (intracellular) electrodes.
FAQs
The outcome depends on both the chelator’s affinity for Ca2+ and the surrounding chemical conditions. These factors determine how much calcium remains free rather than bound, so the same nominal calcium addition can produce different biologically available concentrations in different systems. Because binding is reversible, changes in conditions can also shift calcium availability and alter the experimental effect.
Calcium chelation can separate effects caused by free calcium from responses that occur later in a pathway. If reducing available calcium changes an assay or cellular response, the result supports calcium dependence, but the response may still reflect downstream signaling rather than direct calcium action. This distinction helps interpret enzyme, membrane, and intracellular signaling experiments more carefully.
Reversibility makes calcium chelation useful for testing calcium-sensitive mechanisms rather than simply eliminating calcium permanently. Researchers can examine how a system responds when calcium availability is reduced and how outcomes relate to the balance between bound and free ions. This is especially relevant when interpreting changes in enzyme activity, membrane interactions, or intracellular signaling.
In a biochemical buffer, the key experimental consideration is the amount of free calcium that remains after the chelator is present. Researchers use the system to control calcium availability and then examine a calcium-dependent readout, such as enzyme activity. This design helps relate the observed change to calcium conditions while recognizing that ligand strength and surrounding chemistry influence the result.
Within cells, calcium chelation provides a way to perturb calcium availability and observe resulting biological responses. Researchers can compare cellular signaling or other calcium-sensitive outcomes under controlled calcium conditions, using the comparison to distinguish effects linked to free calcium from later pathway responses. The approach is therefore valuable for connecting ion availability with intracellular signaling behavior.
Beyond laboratory assays, calcium chelation provides context for studying mineral balance and calcium-sensitive therapeutics. Its relevance comes from the ability of ligand binding to change calcium availability without treating calcium as a single, unchanging pool. Examining the ligand, its conditions, and the resulting free-calcium level can help connect molecular binding behavior with broader biological or therapeutic questions.