Navigation Links
Penn Scientists Engineer Small Molecules to Probe Proteins Deep Inside Cell Membrane

PHILADELPHIA -- Proteins, which form much of the molecular machinery required for life, are the targets of most drug molecules//. One third of all proteins are membrane proteins – embedded within the cell’s fatty outer layer. While scientists can easily study the other two-thirds using such tools as antibodies, they have not had such methods to investigate the membrane-embedded portions of proteins.

To probe the secrets of these seemingly inaccessible proteins, researchers at the University of Pennsylvania School of Medicine have designed peptides that are able to bind to specific regions of transmembrane proteins, using computer algorithms, and information from existing protein sequence and structure databases. This study, which appears in the March 30 issue of Science, looks at how the binding of these designed peptides affects the crucial first steps in blood clotting.

"We can now actually interrogate parts of proteins within the membrane," says senior author William F. DeGrado, PhD, Professor of Biochemistry and Biophysics. "We used computer programs to design small proteins called peptides that can bind to only one of a number of closely related membrane proteins."

The researchers targeted two transmembrane proteins called integrins that influence the behavior of platelets, small blood cells important in clotting. One of these, the áIIba3 integrin, the most prominent integrin on platelets, is involved in making platelet aggregates, an important first step in the clotting process.

The other integrin, called áVa3, behaves much like áIIba3, in that it causes platelets to stick to certain proteins on the outside of the cell. "We wanted to see if we could differentiate between the two integrins using two different peptides – and, in fact, we can," notes co-senior author Joel Bennett, MD, Professor of Medicine, who works with proteins and cells important in clotting.

When the designed peptide is inserted into the plat elet membrane it binds to the portion of the integrin within the membrane, and subsequently perturbs another function in the clotting process downstream. "By having molecules that bind to the membrane-embedded portions of these proteins, we were able to address questions concerning the way that these proteins are regulated to cause clotting," explains co-first author Joanna Slusky, a doctoral student in the DeGrado laboratory.

"Therapeutics derived from this approach are a long way off, but this method allows us to now study these interactions that are so fundamental to the way in which cells cooperate to carry out essential functions," says Bennett. "In the future, this knowledge can provide insights for identifying novel drug targets."

Source-EurekalertSRM
'"/>




Related medicine news :

1. Scientists plan human cloning clinic in the United States
2. Scientists found ancient Human Germ Killer
3. Scientists locate key hormone involved in appetite control
4. Scientists open the book of life
5. Scientists review SARS
6. Scientists crack dengue fever puzzle
7. Scientists push to lower hidden sodium in food
8. Indian Scientists Make Wide-Ranging Analysis And Annotation Of X Chromosome
9. Scientists have found effective brain regions for deep brain stimulation for Parkinson’s
10. Scientists reveal the secrets of sarcasm
11. Scientists Unveil Mechanism Behind Resistance to Severe Malaria
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/26/2016)... ... June 26, 2016 , ... On June 10-11, 2016, A ... 2016 Cereal Festival and World’s Longest Breakfast Table in Battle Creek, MI, where the ... history as home to some of the world’s leading providers of cereal and other ...
(Date:6/25/2016)... , ... June 25, 2016 , ... ... policy issues and applications at AcademyHealth’s Annual Research Meeting June 26-28, 2016, at ... on several important health care topics including advance care planning, healthcare costs and ...
(Date:6/25/2016)... (PRWEB) , ... June 25, 2016 , ... As a ... Magna Cum Laude and his M.D from the David Geffen School of Medicine at ... returned to Los Angeles to complete his fellowship in hematology/oncology at the UCLA-Olive View-Cedars ...
(Date:6/24/2016)... ... ... Those who have experienced traumatic events may suffer from a complex set of ... or alcohol abuse, as a coping mechanism. To avoid this pain and suffering, Serenity ... event. , Trauma sufferers tend to feel a range of emotions, from depression, guilt, ...
(Date:6/24/2016)... ... June 24, 2016 , ... Dr. Amanda Cheng, an ... Cheng has extensive experience with all areas of orthodontics, including robotic Suresmile technology, ... , Micro-osteoperforation is a revolutionary adjunct to orthodontic treatment. It can be ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)... June 24, 2016 Research ... "Structural Electronics 2015-2025: Applications, Technologies, Forecasts" ... In-Mold Electronics, Smart Skin, Structural Health ... Structural electronics involves electronic and/or electrical ... structures, replacing dumb structures such as vehicle bodies ...
(Date:6/24/2016)... Research and Markets has announced the addition of ... report to their offering. ... The World Market for Companion Diagnostics covers the world market ... the report includes the following: , World ... Region (N. America, EU, ROW), 2015-2020 , World IVD ...
(Date:6/24/2016)... , June 24, 2016  Arkis BioSciences, ... less invasive and more durable cerebrospinal fluid treatments, ... funding.  The Series-A funding is led by Innova ... Fund, and other private investors.  Arkis, new financing ... instrumentation and the market release of its in-licensed ...
Breaking Medicine Technology: