Related Experiment Video
Updated: Jun 20, 2026
10:30
Delivery of Proteins, Peptides or Cell-impermeable Small Molecules into Live Cells by Incubation with the Endosomolytic Reagent dfTAT
Published on: September 2, 2015
P-TEFb- the final frontier.
1Veterinary Research Institute, Hudcova 70, 621 00 Brno, Czech Republic. Kohoutek@vri.cz.
Cell Division
|September 3, 2009
Summary
The positive transcription elongation factor b (P-TEFb) regulates gene expression by controlling transcription elongation. Recent discoveries reveal its crucial roles beyond transcription, impacting cell cycle, development, and disease.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Gene expression regulation is vital for cellular processes.
- Transcription elongation by RNA polymerase II (RNAPII) is a key regulatory step.
- Positive transcription elongation factor b (P-TEFb) is known to promote transcription elongation.
Purpose of the Study:
- To discuss emerging discoveries on P-TEFb's functions beyond transcription.
- To explore P-TEFb's roles in cell cycle, development, and disease.
- To present future perspectives on P-TEFb research.
Main Methods:
- Literature review of recent findings on P-TEFb.
- Analysis of P-TEFb's molecular composition and assembly.
- Connecting P-TEFb's known function to new physiological roles.
Main Results:
- P-TEFb, comprising CDK9 and cyclin T, phosphorylates RNAPII CTD and negative factors.
- Emerging evidence links P-TEFb to cell cycle regulation.
- P-TEFb is implicated in developmental processes and various diseases.
Conclusions:
- P-TEFb plays a multifaceted role in cellular physiology.
- Understanding P-TEFb's broader functions opens new avenues for disease research.
- Further investigation into P-TEFb's mechanisms is warranted.
Related Concept Videos
01:26Escape Velocity
The escape velocity of an object is defined as the minimum initial velocity that it requires to escape the surface of another object to which it is gravitationally bound and never to return. For example, what would be the minimum velocity at which a satellite should be launched from the Earth's surface such that it just escapes the Earth's gravitational field?
To calculate the escape velocity, it is assumed that no energy is lost to any frictional forces. In practice, a satellite launched from...
To calculate the escape velocity, it is assumed that no energy is lost to any frictional forces. In practice, a satellite launched from...
01:05Total Internal Reflection Fluorescence Microscopy
Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
01:20Discrete-Time Fourier Series
The Discrete-Time Fourier Series (DTFS) is a fundamental concept in signal processing, serving as the discrete-time counterpart to the continuous-time Fourier series. It allows for the representation and analysis of discrete-time periodic signals in terms of their frequency components. Unlike its continuous counterpart, which utilizes integrals, the calculation of DTFS expansion coefficients involves summations due to the discrete nature of the signal.
For a discrete-time periodic signal x[n]...
For a discrete-time periodic signal x[n]...
01:12Rocket Propulsion In Empty Space - II
The motion of a rocket is governed by the conservation of momentum principle. A rocket's momentum changes by the same amount (with the opposite sign) as the ejected gases. As time goes by, the rocket's mass (which includes the mass of the remaining fuel) continuously decreases, and its velocity increases. Therefore, the principle of conservation of momentum is used to explain the dynamics of a rocket's motion. The ideal rocket equation gives the change in velocity that a rocket experiences by...
01:13Rocket Propulsion in Empty Space - I
The driving force for the motion of any vehicle is friction, but in the case of rocket propulsion in space, the friction force is not present. The motion of a rocket changes its velocity (and hence its momentum) by ejecting burned fuel gases, thus causing it to accelerate in the direction opposite to the velocity of the ejected fuel. In this situation, the mass and velocity of the rocket constantly change along with the total mass of ejected gases. Due to conservation of momentum, the rocket's...
02:45Nuclear Fusion
The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...