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Ligand Binding and Linkage00:49

Ligand Binding and Linkage

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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to  N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
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Electron Transport Chain: Complex III and IV01:43

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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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The Type 1 Blue Copper Site: From Electron Transfer to Biological Function.

Trinidad Arcos-López, Nils Schuth, Liliana Quintanar

    Metal Ions in Life Sciences
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    Summary

    Blue copper (Cu) centers in cupredoxins are highly efficient biological electron transfer sites. Protein scaffolds tune these sites

    Area of Science:

    • Biochemistry and Biophysics
    • Bioinorganic Chemistry
    • Protein Science

    Background:

    • Cupredoxins feature Type 1 (T1) or blue copper centers, crucial for biological electron transfer.
    • These centers exhibit a conserved inner coordination sphere (two histidines, one cysteine) and a variable axial ligand.
    • The unique structural and electronic properties enable efficient and tunable electron transfer (ET).

    Purpose of the Study:

    • To highlight the properties that make T1 copper centers efficient and tunable ET sites.
    • To discuss the role of the protein scaffold in modulating the electronic structure, geometry, and reduction potential of T1 Cu sites.
    • To explore how these features are optimized for biological functions and ET processes.

    Main Methods:

    • Analysis of structural, electronic, and geometric features of T1 Cu centers.

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  • Investigation of the contributions of the first coordination shell and Cu-S(Cys) bond covalency.
  • Examination of protein scaffold effects, including the 'entatic' state and axial ligand variations.
  • Application of Marcus theory to explain intra- and inter-molecular ET.
  • Case studies of naturally occurring perturbed blue Cu sites and multicopper oxidases.

    • Main Results:

    • The T1 Cu site's distorted tetrahedral geometry ('entatic' state) minimizes redox-induced changes.
    • Protein environment fine-tunes reduction potentials through axial ligands and outer sphere effects.
    • Anisotropic covalency of the blue Cu site contributes to efficient ET in enzymes like multicopper oxidases.
    • Protein scaffold actively tunes T1 Cu site properties for specific biological roles.

    Conclusions:

    • T1 copper centers are highly optimized and tunable biological electron transfer sites.
    • The protein scaffold plays a critical role in dictating the unique geometric, electronic, and redox properties.
    • Understanding these features provides insights into efficient biological electron transfer mechanisms.