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Related Concept Videos

Histone Modification02:32

Histone Modification

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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
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Behavioral approaches have often been criticized for ignoring mental processes and focusing solely on observable behavior. However, these approaches provide an optimistic perspective for individuals seeking to change their behaviors. Rather than concentrating on intrinsic personality traits, behavioral approaches suggest that even longstanding habits can be modified by changing the reward contingencies that maintain them.
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In an underdamped second-order system, where the damping ratio ζ is between 0 and 1, a unit-step input results in a transfer function that, when transformed using the inverse Laplace method, reveals the output response. The output exhibits a damped sinusoidal oscillation, and the difference between the input and output is termed the error signal. This error signal also demonstrates damped oscillatory behavior. Eventually, as the system reaches a steady state, the error diminishes to zero.
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Purification of Tubulin with Controlled Posttranslational Modifications and Isotypes from Limited Sources by Polymerization-Depolymerization Cycles
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Dynamics of Posttranslational Modification Systems: Recent Progress and Future Directions.

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Understanding protein posttranslational modification networks is key for signal transduction. This study analyzes dynamical systems to uncover behaviors like bistability and oscillations, guiding future research in this area.

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Area of Science:

  • Biophysics
  • Systems Biology
  • Biochemistry

Background:

  • Posttranslational modification (PTM) of proteins is crucial for cellular signal transduction.
  • Understanding how PTM networks process information requires analyzing their complex dynamics.
  • Key questions involve identifying network properties like bistability and sustained oscillations.

Purpose of the Study:

  • To review recent theoretical progress in analyzing PTM network dynamics.
  • To highlight important future research directions in the field.
  • To summarize analytical techniques for understanding these biological networks.

Main Methods:

  • Analysis of dynamical systems arising from PTM networks.
  • Investigating network properties such as bistability and oscillations.
  • Employing techniques like variable elimination for steady-state parameterization.

Main Results:

  • Recent advances in understanding information processing by PTM networks are presented.
  • Techniques for analyzing general biological networks are summarized.
  • The impact of incorporating intermediates on network dynamics is discussed.

Conclusions:

  • Theoretical analysis of dynamical systems is essential for understanding PTM networks.
  • Further research is needed to fully elucidate the computational capabilities of these networks.
  • Advanced analytical methods can reveal critical network behaviors and parameter dependencies.