Related Experiment Video
Updated: Jul 3, 2026
11:34
Exploring Sequence Space to Identify Binding Sites for Regulatory RNA-Binding Proteins
Published on: August 9, 2019
PHB2 interacts with RNF2 and represses CP2c-stimulated transcription
Sun-Joo Lee1, Dongwon Choi, Hyangshuk Rhim
1Korea University, Seoul, South Korea.
Molecular and Cellular Biochemistry
|July 17, 2008
Summary
Ring finger protein 2 (RNF2), a polycomb protein, interacts with PHB2 to regulate gene transcription. This study reveals a novel mechanism where RNF2 and PHB2 modulate the CP2-mediated transcriptional pathway, impacting alpha-globin gene expression.
Area of Science:
- Molecular Biology
- Epigenetics
- Transcriptional Regulation
Background:
- Ring finger protein 2 (RNF2) is a key component of Polycomb Repressive Complex (PRC) involved in transcriptional regulation.
- RNF2 is known to interact with various proteins, suggesting diverse functional roles.
- Understanding RNF2's interactions is crucial for elucidating its multifaceted activities.
Purpose of the Study:
- To investigate the interaction between RNF2 and PHB2.
- To determine the functional consequences of the RNF2-PHB2 interaction on transcriptional activity.
- To elucidate the mechanism by which RNF2 and PHB2 modulate the CP2-mediated transcriptional pathway.
Main Methods:
- Yeast two-hybrid system for identifying protein-protein interactions.
- Luciferase reporter assays to quantify transcriptional activity.
- Co-immunoprecipitation and deletion mutant analyses to map interaction domains and functional cooperation.
Main Results:
- RNF2 directly interacts with PHB2.
- RNF2 represses CP2c-stimulated luciferase activity in a PHB2 dose-dependent manner.
- The N-terminal region of RNF2 (1-158) mediates interaction with PHB2, while the C-terminal region interacts with CP2c.
- RNF2 and PHB2 are involved in the CP2-stimulated expression of the alpha-globin gene.
Conclusions:
- RNF2 and PHB2 form a complex that modulates CP2-mediated transcription.
- This interaction provides a novel mechanism for regulating gene expression, specifically impacting alpha-globin gene activity.
- The findings contribute to understanding the regulatory roles of RNF2 and its interacting partners in transcriptional control.
Related Concept Videos
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...
02:23Master Transcription Regulators
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
02:04Co-activators and Co-repressors
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
01:58Prokaryotic Transcriptional Activators and Repressors
The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...
Transcription of prokaryotic...
01:58Prokaryotic Transcriptional Activators and Repressors
The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...
Transcription of prokaryotic...