Blue Copper Proteins: A rigid machine for efficient electron transfer, a flexible device for metal uptake
Sergio Alejo Pérez-Henarejos1, Luis A Alcaraz2, Antonio Donaire1
1Department of Inorganic Chemistry, Faculty of Chemistry, University of Murcia, Campus Universitario de Espinardo, 30100 Murcia, Spain.
Archives of Biochemistry and Biophysics
|September 4, 2015
Summary
Blue Copper Proteins (BCPs) exhibit distinct structural dynamics. Holoproteins are rigid for electron transfer, while apoforms are flexible for metal uptake, reconciling seemingly contradictory roles.
Area of Science:
- Biochemistry
- Biophysics
- Structural Biology
Background:
- Blue Copper Proteins (BCPs) are small, soluble proteins crucial for biological electron transfer.
- Their electronic and tertiary structures are key to function.
- The entatic/rack-induced mechanism explains their electron transfer capabilities.
Purpose of the Study:
- To detail the electronic and tertiary structure of BCPs.
- To explain the entatic/rack-induced mechanism using thermodynamic parameters.
- To discuss the contradictory dynamics of BCP holoproteins and apoforms.
- To explore the therapeutic potential of azurin and related peptides in cancer.
Main Methods:
- Thermodynamic parameter comparison between folded and unfolded rusticyanin.
- Analysis of NMR solution data for BCP apoforms.
- Review of existing literature on BCP structure-function relationships and therapeutic applications.
Main Results:
- The entatic/rack-induced mechanism is elaborated by comparing thermodynamic data of rusticyanin's states.
- NMR data reveal micro-to-second timescale flexibility in the active sites of BCP apoforms.
- A reconciliation of the rigidity required for holoprotein electron transfer and apoform flexibility for metal binding is presented.
Conclusions:
- BCPs demonstrate a dual nature: rigidity for function and flexibility for metal acquisition.
- The findings reconcile the seemingly opposing structural requirements for BCPs.
- Azurin and derived peptides show promise in anticancer therapy.
More Related Videos
Related Concept Videos
00:56Extraction: Advanced Methods
1.3K
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
1.3K
01:43Electron Transport Chain: Complex III and IV
9.7K
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...
9.7K
02:51Metal-Ligand Bonds
25.6K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
25.6K
01:08Electrodeposition
1.9K
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
1.9K
03:02Colors and Magnetism
14.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.6K
01:29Electron Transport Chain Components
1.2K
The electron transport chain (ETC) is a crucial metabolic pathway that facilitates energy conversion in prokaryotic and eukaryotic cells. In eukaryotes, the ETC comprises four membrane-associated protein complexes in the inner mitochondrial membrane. In prokaryotes, the ETC in the plasma membrane can vary in composition, with fewer or different complexes depending on the organism and environmental conditions. These complexes transfer electrons from electron donors, such as NADH and FADH2, to...
1.2K