The polycomb protein and E3 ubiquitin ligase ring 1B harbors an IRES in its highly conserved 5′ UTR

6Citations
Citations of this article
28Readers
Mendeley users who have this article in their library.

Abstract

Ring1B is an essential member of the highly conserved Polycomb group proteins, which orchestrate developmental processes, cell growth and stem cell fate by modifying local chromatin structure. Ring1B was found to be the E3 ligase that monoubiquitinates histone H2A, which adds a new level of chromatin modification to Polycomb group proteins. Here we report that Ring1B belongs to the exclusive group of proteins that for their translation depend on a stable 5' UTR sequence in their mRNA known as an Internal Ribosome Entry Site (IRES). In cell transfection assays the Ring1B IRES confers significantly higher expression levels of Ring1B than a Ring1B cDNA without the IRES. Also, dual luciferase assays show strong activity of the Ring1B IRES. Although our findings indicate Ring1B can be translated under conditions where cap-dependent translation is impaired, we found the Ring1B IRES to be cap-dependent. This raises the possibility that translational control of Ring1B is a multi-layered process and that translation of Ring1B needs to be maintained under varying conditions, which is in line with its essential role as an E3 ligase for monoubiquitination of histone H2A in the PRC1 Polycomb protein complex.

Cite

CITATION STYLE

APA

Boutsma, E., Noback, S., & van Lohuizen, M. (2008). The polycomb protein and E3 ubiquitin ligase ring 1B harbors an IRES in its highly conserved 5′ UTR. PLoS ONE, 3(6). https://doi.org/10.1371/journal.pone.0002322

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free