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Related Concept Videos

pre-mRNA Processing02:01

pre-mRNA Processing

In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
RNA Stability01:53

RNA Stability

Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
Nuclear Export of mRNA02:31

Nuclear Export of mRNA

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...
Bacterial Transcription01:53

Bacterial Transcription

RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:
Pre-mRNA Processing: Modification of pre-mRNA Ends01:35

Pre-mRNA Processing: Modification of pre-mRNA Ends

In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps the cell...

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Related Experiment Video

Updated: Jul 17, 2026

In vitro Transcription and Capping of Gaussia Luciferase mRNA Followed by HeLa Cell Transfection
08:55

In vitro Transcription and Capping of Gaussia Luciferase mRNA Followed by HeLa Cell Transfection

Published on: March 26, 2012

What messenger RNA capping tells us about eukaryotic evolution.

Stewart Shuman

    Nature Reviews. Molecular Cell Biology
    |August 3, 2002
    PubMed
    Summary

    The 5' cap, essential for eukaryotic mRNA, is formed by three enzymes. Variations in these enzymes across species offer clues into eukaryotic and viral evolution.

    Area of Science:

    • Molecular Biology
    • Genetics
    • Evolutionary Biology

    Background:

    • The 5' cap is a distinguishing modification of eukaryotic messenger RNA (mRNA), absent in prokaryotes.
    • This modification is crucial for mRNA stability, translation initiation, and nuclear export in eukaryotes.
    • The capping process involves a series of enzymatic reactions at the 5' end of nascent RNA transcripts.

    Approach:

    • Comparative analysis of the enzymatic machinery responsible for mRNA capping across diverse eukaryotic species.
    • Investigating the genetic organization and structural variations of capping enzymes.
    • Utilizing bioinformatics and molecular techniques to study enzyme evolution.

    Key Points:

    • The 5' capping pathway is conserved among eukaryotes but exhibits significant species-specific variations in enzyme structure and gene organization.

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  • These variations highlight the dynamic nature of essential cellular processes during eukaryotic evolution.
  • Studying enzyme differences provides a unique window into the evolutionary history of both eukaryotes and their associated viruses.

    • Conclusions:

    • The structural and genetic diversity of mRNA capping enzymes reflects the evolutionary trajectories of eukaryotic organisms.
    • Understanding these variations is key to deciphering the co-evolution of hosts and viruses.
    • The 5' cap machinery serves as a valuable molecular marker for tracing eukaryotic evolutionary history.