Non-heme Iron Binding
Non-heme Iron Binding - Related Videos
03:03
Bathophenanthroline Sulfonate-Based Colorimetric Assay: A Simple and Rapid Method for Quantitation of Non-Heme Iron in Mouse Liver Tissue
0 Views •
2025
In this video, we describe a colorimetric-based method to determine non-heme iron content in mouse liver tissue. Bathophenanthroline sulfonate is used as the chromogenic substrate in the presence of a reducing agent, which converts ferric iron to chelatable ferrous iron.
05:08
Measurement of Tissue Non-Heme Iron Content using a Bathophenanthroline-Based Colorimetric Assay
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Cited by 8 •
2022
Here, a protocol for the measurement of the non-heme iron content in animal tissues is provided, using a simple, well-established colorimetric assay that can be easily implemented in most laboratories.
09:43
Measurement of Heme Synthesis Levels in Mammalian Cells
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Cited by 12 •
2015
Altered intracellular heme levels are associated with common diseases such as cancer. Thus, there is a need to measure heme biosynthesis levels in diverse cells. The goal of this protocol is to provide a fast and sensitive method to measure and compare the levels of heme synthesis in different cells.
08:45
Quantitating Iron Transport Across the Mouse Placenta In Vivo Using Nonradioactive Iron Isotopes
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Cited by 3 •
2022
This article demonstrates how to prepare and administer transferrin-bound nonradioactive isotopic iron for studies of iron transport in mouse pregnancy. The approach for quantifying isotopic iron in fetoplacental compartments is also described.
06:39
Bioluminescence Imaging of Heme Oxygenase-1 Upregulation in the Gua Sha Procedure
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Cited by 40 •
2009
Gua Sha, traditional Chinese therapeutic skin scraping, causes subcutaneous microvascular blood extravasation. We report a protocol of bioluminescence imaging of HO-1-luciferase transgenic mice to demonstrate that Gua Sha upregulates heme oxygenase-1 (HO-1) in multiple organs.
FAQs
Binding behavior depends on which ligand atoms surround the iron and how they arrange in three-dimensional space. Amino acid side chains, small metabolites, and water can provide these coordinating atoms, while the resulting geometry influences affinity and reactivity. Consequently, changes in ligand identity or arrangement can shift whether iron remains stabilized or participates in chemical transformations.
Oxidation state changes the chemical behavior of the bound iron, including its affinity, reactivity, and redox properties. These effects determine whether a site is suited for stabilizing iron or enabling reactions such as oxygen activation and electron transfer. Examining oxidation state alongside coordination geometry is therefore essential for interpreting the function of an iron-binding site.
The key distinction is the molecular environment surrounding the iron. Non-heme sites use ligand atoms from amino acid side chains, small metabolites, or water rather than a porphyrin-based heme group. This difference creates alternative coordination geometries and electronic environments, helping biological systems use iron in diverse storage, transport, electron-transfer, and catalytic roles.
The role of a site depends on how its ligands, coordination geometry, and iron oxidation state shape reactivity. A configuration that stabilizes the metal can support storage or transport, whereas an arrangement that positions iron for chemical interaction can support enzyme activity. The same general binding principle therefore contributes to both metal management and substrate transformation.
Analysis should consider the identity of the coordinating ligands, the geometry around the iron, and its oxidation state. These features provide a framework for predicting affinity, stability, reactivity, and redox behavior. Relating those properties to the surrounding biological role can indicate whether the site primarily supports iron storage, transport, oxygen activation, electron transfer, or substrate transformation.
Non-heme iron binding links molecular coordination chemistry with cellular iron homeostasis. When binding interactions stabilize or position iron appropriately, they support transport, storage, and metalloprotein function. Studying these interactions also clarifies the molecular consequences of iron imbalance, because altered control of iron can affect metal-dependent biochemical processes and the activities of proteins that rely on iron.