Related Experiment Video
Updated: May 21, 2026
10:59
Artificial RNA Polymerase II Elongation Complexes for Dissecting Co-transcriptional RNA Processing Events
Published on: May 13, 2019
Analysis of cofactor effects on RNA helicases
Crystal Young1, Katrin Karbstein
1Department of Chemistry, University of Michigan, Ann Arbor, Michigan, USA.
Methods in Enzymology
|June 21, 2012
Summary
This study provides a guide for identifying RNA helicase cofactors and assessing their impact on helicase function through biochemical assays. Understanding these interactions is crucial for RNA metabolism research.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- RNA helicases are essential enzymes regulating all RNA metabolism processes.
- Conserved helicase cores necessitate cofactor interactions for specific cellular functions.
- Structural studies offer insights, but biochemical validation is critical for understanding cofactor effects.
Purpose of the Study:
- To present a comprehensive guide for identifying RNA helicase cofactors.
- To detail biochemical methods for studying cofactor influence on helicase activity.
- To enable thorough characterization of cofactor-mediated regulation of RNA helicases.
Main Methods:
- Identification of potential RNA helicase-specific cofactors.
- Biochemical assays to measure RNA binding and release kinetics.
- Enzymatic activity assessments including ATPase activity and nucleotide affinity.
- RNA helicase activity assays such as unwinding and annealing.
Main Results:
- Established a systematic approach for cofactor identification.
- Demonstrated the utility of biochemical assays in characterizing cofactor effects.
- Provided a framework for fully analyzing how cofactors modulate RNA helicase function.
Conclusions:
- Biochemical characterization is essential for validating structural insights into RNA helicase-cofactor interactions.
- The described methods allow for a complete understanding of cofactor roles in RNA helicase regulation.
- This guide facilitates research into RNA helicase specificity and function in cellular processes.
Related Concept Videos
00:55DNA Helicases
DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
01:53RNA 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...
01:53RNA 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...
02:36RNA Polymerase II Accessory Proteins
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
02:36RNA Polymerase II Accessory Proteins
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
00:58Eukaryotic RNA Polymerases
RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
All three eukaryotic RNAPs require specific transcription factors, of which the...