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RNA Polymerase II Accessory Proteins

RNA 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...

RNA Polymerase II Accessory Proteins

RNA 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...

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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...

Eukaryotic RNA Polymerases

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Artificial RNA Polymerase II Elongation Complexes for Dissecting Co-transcriptional RNA Processing Events

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The CTD code of RNA polymerase II: a structural view.

Olga Jasnovidova¹, Richard Stefl

¹CEITEC-Central European Institute of Technology, Masaryk University, Brno, Czech Republic.

Wiley Interdisciplinary Reviews. RNA

|October 9, 2012

Summary

RNA polymerase II

Area of Science:

Molecular Biology
Biochemistry
Genetics

Background:

RNA polymerase II (RNA pol II) is crucial for gene expression and co-transcriptional processing.
The C-terminal domain (CTD) of RNA pol II, composed of heptapeptide repeats, interacts with numerous factors.
Post-translational modifications of the CTD form a 'CTD code' that regulates transcription.

Purpose of the Study:

To investigate the roles of proline isomerization and other CTD modifications beyond serine phosphorylation.
To understand how dynamic remodeling of CTD modifications acts as structural switches.
To elucidate the mechanisms by which these switches regulate processing factor binding.

Main Methods:

Analysis of structural studies involving the CTD bound to various proteins.

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Investigating the dynamic remodeling of CTD modifications by enzymes like kinases, phosphatases, and isomerases.

Examining the recognition rules for CTD structural switches.

Main Results:

CTD modifications, including proline isomerization, are critical for regulating transcription and co-transcriptional processing.
Dynamic changes in CTD structure and dynamics, driven by enzymatic modifications, act as regulatory switches.
Structural studies reveal how protein factors recognize these CTD switches to assemble processing machineries.

Conclusions:

The CTD code, encompassing various modifications, plays a vital role in coordinating gene expression and RNA processing.
Understanding CTD modification dynamics and recognition is key to deciphering the assembly of transcription-associated complexes.
Further research into less-characterized CTD modifications is needed to fully grasp its regulatory functions.