The results of their study are reported in the journal Nature Communications.
Cholesterol's role in heart disease has given it a bad reputation. But inside the thin membrane of a cell, the tight regulation of cholesterol at high levels (30 to 40 percent) suggests that it plays an important role in cellular processes, says Wonhwa Cho, professor of chemistry at the University of Illinois at Chicago and principal investigator on the study.
Cho and colleagues had previously found evidence that cholesterol was directly interacting with many proteins found in the interior of the cell. The interaction seemed necessary for the proper functioning of these proteins.
"This was quite a surprising finding," said Cho, because cholesterol resides within the membrane, sandwiched between its inner and outer face. Cell biologists had thought it could only interact with other biomolecules within the membrane.
In the new study, Cho and his colleagues showed how cholesterol interacts with a scaffolding protein, one of a class of proteins that plays an important role in cell signaling. The researchers showed that cholesterol binds to a region on the protein molecule where one of its signaling partners also binds -- and that disrupting cholesterol binding to the protein makes it unable to activate its partner.
The researchers describe in detail how the protein hooks onto and reaches inside the membrane to find and bind cholesterol.
Cho believes that this strategy for interacting with cholesterol may be used by many interior cellular proteins and offers an insight into what is known about the importance of cholesterol to well-functioning cells.
Much of the existing data on the cholesterol-related regulation of cellular processes had been difficult to interpret, he said.
"This is a major finding that will help people understand how cholesterol may regulate other cellular processes," Cho said.
Ren Sheng, graduate student in chemistry at UIC, was first author of the paper. Other authors are Yong Chen, Ewa Stec, Heather Melowic, Nichole Blatner and Moe Tun, all of the UIC chemistry department; Morten Kallberg and Hui Lu of the UIC bioengineering department; Heon Yung Gee, Yonjung Kim and Min Goo Lee of the Yonse University College of Medicine in Seoul; Takahiro Fujiwara and Akhiro Kusumi of Kyoto University in Japan; and Ji Hye Hong and Kwang Pyo Kim of Konkuk University in Seoul.
This study was supported by the Chicago Biomedical Consortium with the support of the Searle Funds at the Chicago Community Trust; National Institutes of Health grant GM68849; the World Class University program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology; and a grant from the National Project for Personalized Medicine, part of the Korea Health 21 R&D Project of the Korean Ministry of Health and Welfare.
UIC ranks among the nation's leading research universities and is Chicago's largest university with 27,000 students, 12,000 faculty and staff, 15 colleges and the state's major public medical center. A hallmark of the campus is the Great Cities Commitment, through which UIC faculty, students and staff engage with community, corporate, foundation and government partners in hundreds of programs to improve the quality of life in metropolitan areas around the world. For more information about UIC, please visit www.uic.edu.
NOTE: Please refer to the institution as the University of Illinois at Chicago on first reference and UIC on second reference. "University of Illinois" and "U. of I." are often assumed to refer to our sister campus in Urbana-Champaign.
Jeanne Galatzer-Levy | EurekAlert!
Oxygen can wake up dormant bacteria for antibiotic attacks
08.12.2016 | Penn State
NTU scientists build new ultrasound device using 3-D printing technology
07.12.2016 | Nanyang Technological University
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
08.12.2016 | Life Sciences
08.12.2016 | Physics and Astronomy
08.12.2016 | Materials Sciences