The team of scientists led by Dr. Michael Lammers at CECAD, the Cluster of Excellence at the University of Cologne, has discovered that the essential cellular protein Ran is fundamentally regulated by lysine acetylation. Ran belongs to the family of Ras proteins, which regulate fundamental cellular processes such as cell differentiation, cell division, and intracellular transport. Mutations in Ras-related proteins are involved in the development of various types of cancer including colorectal cancer, lung cancer, and lymphomas. Mechanisms that can switch off the functions of Ran protein are therefore of particular therapeutic interest.
Discoveries made by scientists in Cologne lead to new perspectives in the treatment of colorectal cancer, lung cancer, and lymphomas. Dr. Michael Lammers and his research team at CECAD have identified new regulatory mechanisms for Ran protein.
They have shown that all essential functions of the small GTP-binding Ran protein can be regulated by lysine acetylation. Ran is involved in many important cell processes including cell division and protein transport. Dysregulation of these processes has dramatic effects on normal cell development.
Many types of tumor cells have increased concentrations of Ran or Ran-interacting proteins or Ran-regulators. Switching off Ran-function in a targeted manner, using the newly identified regulatory system, may provide novel therapeutic approaches.
The small Ran protein is a molecular switch that can be turned on or off depending on the nucleotide charge. If this switch protein is not regulated properly, there may be far-reaching effects on essential cell functions.
Using high-resolution quantitative mass spectrometry, it has recently been shown that many of many of the amino acids – the lysines – in the Ran protein can be modified by adding an acetyl group. Modifications of this type made to the folded protein, once biosynthesis is complete, essentially alter and regulate protein function. Some of the acetylation sites are to be found in highly relevant functional regions within the Ran protein.
Dr. Lammers: “With a combined synthetic biological, biochemical, and cell biological approach, we have shown that lysine acetylation regulates nearly all essential Ran functions – something that was completely unknown beforehand. For some of the sites, we have also been successful in identifying specific enzymes responsible to modify the protein in this way, adding and removing such modifications. These findings may allow us to develop novel agents for cancer therapy.”
Cancer is the second most common cause of death in industrialized nations and responsible for about 25% of all deaths. The risk of malignancy increases with age – which means that research into the development and treatment of cancer is of great economic and personal interest in an aging society. CECAD, the Cluster of Excellence at the University of Cologne, is carrying out research into aging and its associated diseases. CECAD’s vision is to develop new treatments for the entire spectrum of age-related diseases. Given this aim, the latest findings from Dr. Lammers and his team are of great import.
Published in: Proc. Natl. Acad. Sci. U. S. A.; on June 29th 2015 (Epub)
de Boor, S.*, Knyphausen, P.*, Kuhlmann, N., Wroblowski, S., Brenig, J., Nolte, H., Krüger, M., and Lammers, M. (2015). Small GTP-binding protein Ran is regulated by posttranslational lysine-acetylation. Proc. Natl. Acad. Sci. U. S. A.] 12(28):E3679-88. doi: 10.1073/pnas.1505995112. Epub 2015 Jun 29.
*(contributed equally to the work)
Dr. Michael Lammers
Tel. +49(0) 221-478-84308/84314
Astrid Bergmeister MBA
Head of PR & Marketing, CECAD
University of Cologne
Phone: +49 (0)221 478 84043
Astrid Bergmeister | idw - Informationsdienst Wissenschaft
A Map of the Cell’s Power Station
18.08.2017 | Albert-Ludwigs-Universität Freiburg im Breisgau
On the way to developing a new active ingredient against chronic infections
18.08.2017 | Deutsches Zentrum für Infektionsforschung
Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.
As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...
Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...
For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...
An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...
A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
16.08.2017 | Event News
04.08.2017 | Event News
26.07.2017 | Event News
18.08.2017 | Life Sciences
18.08.2017 | Physics and Astronomy
18.08.2017 | Materials Sciences