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Related Concept Videos

Introduction to Actin01:26

Introduction to Actin

Actin is a highly conserved cytoskeletal protein found abundantly in eukaryotic cells. It constitutes 10% weight of the total cellular protein in muscle cells, while in non-muscle cells, it is lower and makes up around 1–5 percent of the total cell protein. Actin found in the unicellular amoebae and complex multicellular animals is around 80% similar, demonstrating their conservation over a billion years of evolution.  Actin coding genes are conserved within species and across different species.
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Actin Polymerization01:42

Actin Polymerization

Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶  nucleation, elongation, and steady-state phase.
The nucleation phase involves forming a stable nucleus consisting of three actin monomers to form a new actin filament. Actin-binding proteins such as formins and Arp2/3 complex help filament growth post-nucleation. The Formins form straight actin...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Actin Filament Depolymerization01:19

Actin Filament Depolymerization

Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
In F-actin, the ADF/cofilin proteins...
Formation of Higher-order Actin Filaments01:11

Formation of Higher-order Actin Filaments

The polymerization of G-actin monomers into filamentous F-actin is a multi-step process. Once the F-actins are formed, they can bundle together in different arrangements to form higher-order networks and regulate cellular functions. Common examples include the formation of lamellipodia and filopodia at the cell's leading edge by actin reorganization in a migrating cell. The microvilli on the brush border epithelial cells are also formed through the F-actin network.
The high-order actin networks...

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Which density functional should be used to study actinyl complexes?

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Summary
This summary is machine-generated.

The M06 functional accurately models uranium and actinide aqua complex chemistry. This computational method shows promise for studying complex inorganic reactions and redox potentials.

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Area of Science:

  • Computational Chemistry
  • Inorganic Chemistry
  • Quantum Chemistry

Background:

  • Actinide chemistry, particularly for uranium (U), neptunium (Np), and plutonium (Pu), is crucial for nuclear energy and waste management.
  • Understanding the behavior of aqua complexes like [UO(2)(OH(2))(5)](2+) is key to predicting reaction mechanisms.

Purpose of the Study:

  • To evaluate the performance of the new M06 functional for actinide chemistry.
  • To compare M06 with high-level ab initio methods for accuracy.
  • To investigate the water exchange mechanism and redox potentials of relevant aqua complexes.

Main Methods:

  • Utilized the M06 functional for theoretical calculations.
  • Employed high-level ab initio methods for comparison.
  • Studied the water exchange mechanism of [UO(2)(OH(2))(5)](2+).
  • Calculated redox potentials for aqua complexes of [AnO(2)](2+) (An = U, Np, Pu).

Main Results:

  • The M06 functional demonstrated competitive accuracy compared to high-level ab initio methods.
  • The study successfully modeled the water exchange mechanism of the uranyl ion complex.
  • Redox potentials for aqua complexes of U, Np, and Pu were accurately reproduced.

Conclusions:

  • The M06 functional is a reliable and efficient tool for studying actinide aqua complex chemistry.
  • M06 offers a viable alternative to more computationally expensive methods for these systems.
  • This work provides valuable insights into the reactivity and electronic properties of important actinide species.