About 50 years ago, electron microscopy revealed the presence of tiny blob-like structures that form inside cells, move around and disappear. But scientists still don't know what they do — even though these shifting cloud-like collections of proteins are believed to be crucial to the life of a cell, and therefore could offer a new approach to disease treatment.
In the Journal of Cell Biology, two researchers are issuing a call to investigators from various backgrounds, from biophysics to cell biology, to focus their attention on the role of these formations— for which they coin a new unifying term "assemblages."
"I want to know what these assemblages are doing in Ewing sarcoma, the disease I concentrate on — and I would think all other researchers who study human biology would want to know their functions in both health and disease," says Jeffrey Toretsky, MD, professor in the department of oncology and pediatrics at Georgetown Lombardi Comprehensive Cancer Center.
So Toretsky partnered with co-author Peter Wright, PhD, professor in the department of integrative structural and computational biology at The Scripps Research Institute in La Jolla, Calif., to pull together all the biophysics and protein biochemistry knowledge available on assemblages into a review article. Toretsky also called on the expertise of chemists and physicists from Georgetown University.
The authors say these assemblages are often, but not always, made up of proteins that are intrinsically disordered, meaning that they do not assume a specific shape in order to fit like a lock and key onto other proteins. These intrinsically disordered proteins seem to find each other and then form into gel-like assemblages — a process called "phase separation" — that can trap and interact with other proteins and even RNA, biological molecules that help decode and regulate genes.
When their work is done — whatever that is — the assemblages dissolve, Toretsky says.
"It is only in the last five years that researchers have begun recognizing that proteins without fixed structures may have important transitional properties that change based upon their local abundance in cells," he says.
Toretsky suspects that if these assemblages play a role in disease, they could be targeted with a small molecule. "Current drug-discovery dogma suggests that it is very hard to make a small molecule to prevent two structured proteins from interacting. However, small molecules have a greater likelihood of disrupting intrinsically disordered protein-protein interactions," he says.
"This review links together very basic biologic phenomena of protein interaction with the potential for new drug discovery," Toretsky says. "It's an exciting challenge."
Support for this work came from Burroughs Wellcome Clinical Scientist Award in Translational Research and grants from the National Institutes of Health (R01CA133662, R01CA138212, RC4CA156509, R01CA96865).
The authors report having no personal financial interests related to the describe research.
About Georgetown Lombardi Comprehensive Cancer Center
Georgetown Lombardi Comprehensive Cancer Center, part of Georgetown University Medical Center and MedStar Georgetown University Hospital, seeks to improve the diagnosis, treatment, and prevention of cancer through innovative basic and clinical research, patient care, community education and outreach, and the training of cancer specialists of the future. Georgetown Lombardi is one of only 41 comprehensive cancer centers in the nation, as designated by the National Cancer Institute (grant #P30 CA051008), and the only one in the Washington, DC area. For more information, go to http://lombardi.georgetown.edu.
About Georgetown University Medical Center
Georgetown University Medical Center (GUMC) is an internationally recognized academic medical center with a three-part mission of research, teaching and patient care (through MedStar Health). GUMC's mission is carried out with a strong emphasis on public service and a dedication to the Catholic, Jesuit principle of cura personalis -- or "care of the whole person." The Medical Center includes the School of Medicine and the School of Nursing & Health Studies, both nationally ranked; Georgetown Lombardi Comprehensive Cancer Center, designated as a comprehensive cancer center by the National Cancer Institute; and the Biomedical Graduate Research Organization, which accounts for the majority of externally funded research at GUMC including a Clinical and Translational Science Award from the National Institutes of Health.
Karen Teber | Eurek Alert!
Complementing conventional antibiotics
24.05.2018 | Goethe-Universität Frankfurt am Main
Building a brain, cell by cell: Researchers make a mini neuron network (of two)
23.05.2018 | Institute of Industrial Science, The University of Tokyo
A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.
The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...
At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.
At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...
There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?
At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...
02.05.2018 | Event News
13.04.2018 | Event News
12.04.2018 | Event News
24.05.2018 | Ecology, The Environment and Conservation
24.05.2018 | Medical Engineering
24.05.2018 | Physics and Astronomy