Protein Metal Ion Complex
Protein Metal Ion Complex - Related Videos
03:45
Formation of Complex Ions
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2020
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
16:40
T-wave Ion Mobility-mass Spectrometry: Basic Experimental Procedures for Protein Complex Analysis
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Cited by 51 •
2010
Ion mobility-mass spectrometry is an emerging gas-phase technology that separates ions, based on their collision cross-section and mass. The method provides three-dimensional information on the overall topology and shape of protein complexes. Here, we outline a basic procedure for instrument setting and optimization, calibration of drift times, and data interpretation.
14:44
Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Cited by 4 •
2013
The NMR-solution structure of a metallochaperone model peptide with Cu (I) was determined, and a detailed protocol from sample preparation and 1D and 2D data collection to a three-dimensional structure is described.
05:13
Isolation of Proteins from Viral DNA-protein Complexes
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2026
Source: Dembowski, J. A., et al. Purification of Viral DNA for the Identification of Associated Viral and Cellular Proteins. J. Vis. Exp. (2017).This video demonstrates the isolation of protein–viral DNA complexes from cell nuclei using click chemistry and magnetic bead purification. The protocol involves labeling viral genomes with alkyne-modified nucleotides, biotinylation via a click reaction, and binding to streptavidin-coated magnetic beads. Following washing and heat elution, the purified...
02:41
Protein Complex Assembly
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2020
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes. Many viruses self-assemble into a fully functional unit using the infected host cell to...
FAQs
These conditions influence whether coordination is favored and how the binding site is arranged. Changes in pH can alter the behavior of coordinating amino acid side chains, while oxidation state can change the metal’s binding properties. Local protein geometry determines whether ligands are positioned appropriately, so even small structural differences may affect complex stability or biological activity.
These amino acid side chains act as potential ligands, meaning groups that coordinate the metal ion at defined protein sites. Their identities and arrangement help establish the coordination environment around the ion. Examining which residues participate can therefore connect a protein’s molecular structure with its stability, catalytic behavior, or regulation.
The coordination environment links metal binding to its consequence for the protein. Ligand identity, spatial arrangement, oxidation state, and surrounding geometry can influence whether the complex supports structural organization or biological activity. Characterizing these features helps distinguish a metal-associated structural effect from a role in enzyme function or regulation.
Spectroscopy, crystallography, and biochemical assays provide complementary information. Spectroscopy can help examine features associated with the bound metal, crystallography can reveal the arrangement of the ion and nearby ligands, and biochemical assays can test functional consequences. Using these approaches together connects coordination details with protein stability, enzyme mechanisms, or regulation.
Researchers combine structural characterization with biochemical assays to determine how metal binding relates to enzyme activity. Coordination information identifies the metal’s local environment, while assay results show whether the binding state affects function. This pairing helps evaluate whether the ion contributes to the enzyme mechanism rather than merely being associated with the protein.
This analysis is useful when a study focuses on metalloproteins, metal-dependent regulation, enzyme mechanisms, or changes in protein stability and function. The appropriate measurements can reveal both the coordination environment and its biological consequences. Consequently, researchers can relate molecular binding features to observed biochemical behavior instead of treating metal association as an isolated structural observation.