Navigation Links
Researcher Hits Bulls-Eye for Antibiotic Target

A Purdue University researcher has opened the door for possible antibiotic treatments for a variety of diseases by determining the structure of a protein that controls the// starvation response of E. coli.

This research is applicable to the treatment of many diseases because that same protein is found in numerous harmful bacteria, including those that cause ulcers, leprosy, food poisoning, whooping cough, meningitis, sexually transmitted diseases, respiratory infections and stomach cancer, said David Sanders, an associate professor of biology. Sanders, who is part of the Markey Center for Structural Biology at Purdue, detailed his research in a paper published in the Aug. 16 issue of the journal Structure.

"This is an important discovery for the field of antibiotics, which was greatly in need of something new," Sanders said. "The antibiotics available today face a challenge of increasing resistance and failure. This research suggests a whole new approach to combat bacterial infections. In addition, this protein is an excellent antibiotic target because it only exists in bacteria and some plants, which means the treatment will only affect the targeted bacterial cells and will be harmless to human cells."

Sanders and his collaborator, Miriam Hasson, studied the structure of exopolyphosphatase, a protein in E. coli bacteria that functions as an enzyme and catalyzes chemical reactions within the bacteria. This enzyme provides the signal for bacteria to enter starvation mode and limit reproduction.

"With the ability to control the use of this signal, we can fool bacteria into thinking they are starving all the time, even when they are not; or we could never allow them to realize that they're starving, and that would kill them as well."

Researchers could design drugs to bind to the protein and keep it from being used by the bacteria, rendering the bacteria unable to react to and survive a lack of nutrient supply; the other possibility would be to design a drug to mimic the protein, causing the bacteria to react as if it were starving even when in the presence of a plentiful nutrient supply, Sanders said.

Such a signal exists in almost all living things because most organisms struggle to find food or nutrients and have had to develop a way to avoid starvation, he said.

"Bacteria typically are in an environment lacking nutrients and respond by limiting their reproduction," he said. "And that's a good thing because if they were growing at their maximum rate all the time, within two weeks we would be 20 feet deep in bacteria."

The protein also is of particular interest because it is highly processive, meaning it is efficient in the chemical reaction it initiates. It is able to latch onto its substrate, the substance it uses to fuel its chemical reaction, and to stay tenaciously in place until it has consumed all of the substrate, Sanders said.

Using X-ray crystallography, Sanders was able to show the structure of the E. coli exopolyphosphatase and found the protein had a unique way of achieving its high processivity.

"There is a hole in the protein," he said. "This is extremely rare and provides a physical explanation of why it is so processive. The hole physically encompasses the substrate, keeping it in place, in addition to the usual chemical bonding that keeps it attached. Once the protein attaches to the substrate, it doesn't come off. The protein chews away until it reaches the end of the substrate chain."

Sanders worked with a team to create the first-of-its-kind animated movie showing this process from the point of view of the substrate. The audience follows along as it is pulled through the protein from one side to the next.

"This is the first time this sort of thing has ever been seen, and this is the first movie of its kind," he said. "It elegantly illustrates the physical process of this reaction."

Sanders also determined the structure of the protein and demonstrated that it belongs to the ASKHA (Acetate and Sugar Kinases, Hsp70, Actin) superfamily. Knowing the family to which a protein belongs allows researchers to use existing information about other members of the family to better understand the protein being studied. It also allows information gained from the study to be used for other members of the family, Sanders said.

"Fundamental basic research is the engine that drives the development of technology such as antibiotics," he said. "The next step in this research will be working to develop inhibitors for this protein and studying the applications to other bacteria."

(Source: Newswise)
'"/>




Related medicine news :

1. Researchers urge caution in using ear tube surgery
2. Researchers Scale to assess the Severity of Epilepsy in Kids
3. Researchers trick Alzheimers Enzyme
4. Researchers find new HIV hiding place
5. New Hair in 15 Days Could Now Be A Possibility Say Researchers
6. Researchers developed world’s smallest toothbrus
7. Researchers discover receptor cells that can cause epilepsy
8. 15 Anti-SARS Drugs Identified By China-Europe Team of Researchers
9. Researchers reversed the process of memory loss
10. Researchers Identify Key Gene That May Help Brain Treatment
11. Researchers Discover Protein That Causes Malaria
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:2/5/2016)... ... February 05, 2016 , ... Francisco Canales, ... services in their Napa Valley office. The technique utilizes the body’s own healing ... Canales and Dr. Furnas, are part of only a select few cosmetic surgeons ...
(Date:2/5/2016)... ... ... US Sports Camps , official operators of Nike Yoga Camps, announces ... training. ChildLight Yoga Studio is centrally situated in the picturesque New England city of ... founder Lisa Flynn expresses her excitement, “We are thrilled to be partnering with US ...
(Date:2/5/2016)... ... February 05, 2016 , ... Boar’s Head Brand®, one of ... for this weekend’s Big Game. Take the stress out of your party preparation – ... guests happy at every stage of the game. , “The key to hosting a ...
(Date:2/5/2016)... ... February 05, 2016 , ... ... CitiDent, announces that it is now welcoming orthodontist, Dr. Amanda Cheng, to ... a complete range of oral health care, including general dentistry, cosmetic treatments, periodontics, ...
(Date:2/5/2016)... ... February 05, 2016 , ... On June 9-10, Las ... continuing medical education (CME) event presented by the Association for Comprehensive Care in ... for ACCORD, whose mission is to provide education, tools, and resources to primary ...
Breaking Medicine News(10 mins):
(Date:2/5/2016)... , February 5, 2016 Site ... Today, VoicePower Ltd - The Speech Recognition People, announced their latest ... to improve patient care, reduce turnaround times and to save the ... ,- VoicePower client since 2013 Challenge: --> ... --> - Six doctors ,- Wirral CCG ,- VoicePower ...
(Date:2/4/2016)... , Feb. 4, 2016  Edwards Lifesciences Corporation (NYSE: ... for structural heart disease and critical care monitoring, announced ... repurchase (ASR) agreement with Morgan Stanley & Co. LLC ... repurchase is part of the Company,s previously authorized program ... common stock.  --> ...
(Date:2/4/2016)... , Feb. 4, 2016  SciClone Pharmaceuticals, Inc. ... it has entered into a settlement agreement with ... fully resolving the SEC,s investigation into possible violations ... the terms of the settlement agreement, SciClone has ... including disgorgement, pre-judgment interest and a penalty.  This ...
Breaking Medicine Technology: