Proteins are the chief actors in cells, carrying out the duties specified by information encoded in our genes. Most proteins live only two days or less, ensuring that those damaged by inevitable chemical modifications are replaced with new functional copies.
This super resolution image shows the nucleus of a cell from a rat brain. Each red spot is a individual nuclear pore complex, cellular structures found on the envelope surrounding the nucleus, which are crucial to communications between the nucleus and the rest of the cell. The Salk scientists studied long lived proteins that serve as important structural components of these complexes.
Credit: Courtesy Brandon Toyama, Waitt Advanced Biophotonics Center
In a new study published August 29 in Cell, a team led by researchers at the Salk Institute for Biological Studies and The Scripps Research Institute (TSRI) have now identified a small subset of proteins in the brain that persist for longer, even more than a year, without being replaced. These long-lived proteins have lifespans significantly longer than the typical protein, and their identification may be relevant to understanding the molecular basis of aging.
"Protein longevity can be a major contributor to cellular aging," says Martin Hetzer, a professor in Salk's Molecular and Cell Biology Laboratory and holder of the Jesse and Caryl Philips Foundation Chair, who was a senior author of the study with TSRI Professor John Yates. "Simply identifying all long-lived proteins allows us to focus our studies on these specific proteins, which may be the weakest link in the aging proteome."
The study provides the first comprehensive and unbiased identification of the long-lived proteome, the entire set of proteins expressed by a genome under a given set of environmental conditions. In a study published in Science last year, Hetzer and his colleagues identified long-lived proteins in one sub-cellular location, namely the nucleus.The new study takes the Science findings one step further by providing a system-wide identification of proteins with long lifespans in the rat brain, a laboratory model of human biology. The scientists found that long-lived proteins included those involved in gene expression, neuronal cell communication and enzymatic processes, as well as members of the nuclear pore complex (NPC), which is responsible for all traffic into and out of the nucleus.
"This can be thought of as similar to maintaining a car, where you don't replace the entire car, just the components that have broken down," says lead study author Brandon Toyama, a postdoctoral fellow in Hetzer's laboratory.
Hetzer and his colleagues previously found that NPC deterioration might be a general aging mechanism leading to age-related defects in nuclear function. Other laboratories have linked protein homeostasis, or internal stability, to declining cell function and, thus, disease. The new findings reveal cellular components that are at increased risk for damage accumulation, linking long-term protein persistence to the cellular aging process.
"Now that we have identified these long-lived proteins, we can begin to examine how they may be affected in aging and what the cell does to compensate for inevitable damage," says Toyama.
Hetzer's team is now identifying targets that are involved in aging and potential pathways to address this. "We're starting to think about how to get functionality back to that younger version of the protein," he says.
Other researchers on the study were Jeffery N. Savas, Sung Kyu Park and John R. Yates of TSRI and Michael S. Harris and Nicholas T. Ingolia of the Carnegie Institute for Science.
The work was supported by the National Institutes of Health, the Hewitt Foundation, the Glenn Foundation for Medical Research, the American Cancer Society, the Ellison Medical Foundation, and the Searle Scholars Program.
About the Salk Institute for Biological Studies:
The Salk Institute for Biological Studies is one of the world's preeminent basic research institutions, where internationally renowned faculty probe fundamental life science questions in a unique, collaborative, and creative environment. Focused both on discovery and on mentoring future generations of researchers, Salk scientists make groundbreaking contributions to our understanding of cancer, aging, Alzheimer's, diabetes and infectious diseases by studying neuroscience, genetics, cell and plant biology, and related disciplines.
Faculty achievements have been recognized with numerous honors, including Nobel Prizes and memberships in the National Academy of Sciences. Founded in 1960 by polio vaccine pioneer Jonas Salk, M.D., the Institute is an independent nonprofit organization and architectural landmark.
Kat Kearney | EurekAlert!
Toward a 'smart' patch that automatically delivers insulin when needed
18.01.2017 | American Chemical Society
127 at one blow...
18.01.2017 | Stiftung Zoologisches Forschungsmuseum Alexander Koenig, Leibniz-Institut für Biodiversität der Tiere
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).
Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...
10.01.2017 | Event News
09.01.2017 | Event News
05.01.2017 | Event News
18.01.2017 | Power and Electrical Engineering
18.01.2017 | Materials Sciences
18.01.2017 | Life Sciences