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Nuclear Export of mRNA02:31

Nuclear Export of mRNA

8.8K
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
8.8K
Directional Relays01:25

Directional Relays

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Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
612
Coordination Number and Geometry02:57

Coordination Number and Geometry

19.0K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
19.0K
Overcurrent Relays01:26

Overcurrent Relays

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Overcurrent relays, crucial for circuit protection, are connected to the secondary current of a current transformer. There are two primary types of overcurrent relays: instantaneous and time-delay.
Instantaneous overcurrent relays activate immediately when the input current exceeds a predetermined value, known as the pickup current, instantly energizing the circuit breaker trip coil. This rapid response is vital for addressing severe faults quickly.
Time-delay overcurrent relays, on the other...
535
Differential Relays01:20

Differential Relays

767
Differential relays are used to protect generators, buses, and transformers by comparing electrical quantities at different points. When a fault occurs, the difference in current between the two points triggers the relay to operate, opening the circuit breaker. Under normal conditions, the current entering (i1) and leaving (i2) a generator are equal. When a fault occurs, however, these currents become unequal, and the difference current flows in the relay operating coil, causing the relay to...
767
Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

452
Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
Under normal conditions, low load currents keep the measured...
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Related Experiment Video

Updated: Jan 31, 2026

Complementation of Splicing Activity by a Galectin-3 - U1 snRNP Complex on Beads
08:48

Complementation of Splicing Activity by a Galectin-3 - U1 snRNP Complex on Beads

Published on: December 9, 2020

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Coordinating mRNA maturation: The U1 relay model.

Yoseop Yoon1, Cailyx Quan1, Lindsey V Soles2

  • 1Department of Microbiology and Molecular Genetics, School of Medicine, University of California, Irvine, Irvine, CA 92697, USA.

Molecular Cell
|January 29, 2026
PubMed
Summary
This summary is machine-generated.

Messenger RNA (mRNA) maturation involves coordinated transcription and RNA processing. This study proposes a "U1 relay" model for co-transcriptional splicing and 3' end formation, highlighting bidirectional coupling.

Keywords:
cappingcleavage and polyadenylationdegradationexportnuclear retentionsplicing

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Area of Science:

  • Molecular Biology
  • Gene Expression Regulation
  • RNA Processing

Background:

  • mRNA maturation requires precise coordination of transcription, 5' capping, splicing, and 3' end formation.
  • These processes are tightly coupled through dynamic interactions among RNA polymerase II, the spliceosome, and cleavage-polyadenylation complexes.

Purpose of the Study:

  • To synthesize current mechanistic insights into the communication between transcription elongation factors and RNA processing machineries.
  • To propose a unified framework, the "U1 relay" model, for understanding co-transcriptional splicing and 3' end formation.
  • To discuss RNA sorting into nuclear retention/degradation or export pathways based on processing status.

Main Methods:

  • Literature synthesis of biochemical, structural, and genomic studies.
  • Mechanistic modeling and hypothesis generation ("U1 relay" model).
  • Analysis of feedback mechanisms between RNA processing and transcription.

Main Results:

  • Demonstration of tight coupling between transcription and RNA processing through dynamic molecular interactions.
  • Proposal of the "U1 relay" model unifying co-transcriptional splicing and 3' end formation.
  • Identification of RNA processing status as a key determinant for RNA nuclear fate (retention/export).

Conclusions:

  • RNA processing factors feedback to modulate transcriptional elongation, pausing, and termination.
  • Bidirectional coupling between RNA synthesis and processing reinforces efficient and accurate transcript maturation.
  • The "U1 relay" model provides a framework for understanding the integrated nature of mRNA biogenesis.