A study done on fruit flies and published in Nature Communications reveals that the protein dDsk2, in addition to degrading proteins, also plays a key role in regulating gene expression.
Until today, the proteins known as ubiquitin receptors have been associated mainly with protein degradation, a basic cell cleaning process. A new function now described for the protein dDsk2 by the team headed by Ferran Azorín, group leader at the Institute for Research in Biomedicine (IRB Barcelona) and CSIC research professor, links ubiquitin receptors for the first time with the regulation of gene expression.
This discovery, published today in Nature Communications, opens up a double scenario, one focused on basic epigenomic research and the other biomedical, because of the link between dDsk2 and neurodegenerative diseases.
Double role of ubiquitin
In humans, there are about 100 proteins associated with ubiquitination, the process by which a protein labelled with ubiquitin is removed from the cell by specific cell machinery known as the proteosome. Ubiquitin receptors are involved in the detection of ubiquitination.
Ferran Azorín, head of the "Chromatin structure and function" group says, "although previous data pointed to the possibility of ubiquitin receptors also contribute to cell processes, data were scarce and a direct role in gene regulation had not been demonstrated."
"Ubiquitination related to transcription proteins and to DNA repair had previously been described. But this is the first time that a protein, dDsk2, that recognises the ubiquitination of a histone, a protein that forms part of chromatin, has been identified." Chromatin is a complex formed by DNA and histones --proteins tightly bound to DNA-- packaging it into chromosomes and determining gene expression, a process known as epigenetics.
Recent years have brought about the discovery of the fundamental contribution of epigenetics to the development of disease. "We have now opened a new perspective for ubiquitin receptors and we should further this research", explains Roman Kessler, a Swiss "la Caixa" PhD fellow at IRB Barcelona and first co-author of the paper. In the study, the researchers also reveal the molecular mechanism through which the protein dDsk2 binds to chromatin proteins, thus participating indirectly in the regulation of transcription.
The protein in neurodegenerative diseases
Subjects with Alzheimer's disease and other neurodegenerative pathologies such as Huntington's, have a mutation in the protein ubiquilin, the homologue of dDsk2 in humans. "The role of these mutations in the onset and development of disease is still unknown," says Johan Tisserand, postdoctoral research and co-author of the study who is continuing with the project.
"Now that we have discovered this new function, we aim to study whether it affects degradation or transcription, although probably both processes are altered. Our goal is to work towards unravelling these effects," concludes Ferran Azorín. The new studies will be performed on Drosophila melanogaster and in cells in vitro.
The ubiquitin receptor dDsk2 regulates H2Bub1 and RNApol II pausing at dHP1c-complex target genes
Roman Kessler, Johan Tisserand, Joan Font-Burgada, Oscar Reina, Laura Coch, Camille Stephan-Otto Attolini, Ivan Garcia-Bassets and Fernando Azorín
Nature Communications (2015). DOI: 10.1038/ncomms8049
Sònia Armengou | EurekAlert!
Novel mechanisms of action discovered for the skin cancer medication Imiquimod
21.10.2016 | Technische Universität München
Second research flight into zero gravity
21.10.2016 | Universität Zürich
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.
In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...
'Ferroelectric' materials can switch between different states of electrical polarization in response to an external electric field. This flexibility means they show promise for many applications, for example in electronic devices and computer memory. Current ferroelectric materials are highly valued for their thermal and chemical stability and rapid electro-mechanical responses, but creating a material that is scalable down to the tiny sizes needed for technologies like silicon-based semiconductors (Si-based CMOS) has proven challenging.
Now, Hiroshi Funakubo and co-workers at the Tokyo Institute of Technology, in collaboration with researchers across Japan, have conducted experiments to...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
21.10.2016 | Health and Medicine
21.10.2016 | Information Technology
21.10.2016 | Materials Sciences