Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Elusive protein protects malaria parasite from heme

28.04.2008
Researchers at the Virginia Bioinformatics Institute (VBI) at Virginia Tech have identified Heme Detoxification Protein (HDP), a unique protein encoded in the malaria genome that represents a potential target for developing new malaria drugs.

The team, which includes researchers at Washington University School of Medicine, the United States National Institutes of Health, the United States Food and Drug Administration as well as other researchers at Virginia Tech, has characterized HDP and demonstrated that it plays a major role in protecting Plasmodium as the pathogen pursues infection of its host. The findings were published April 25th in the open-access journal PLoS Pathogens.*

Worldwide, the annual death toll of malaria exceeds 1 million, and children under the age of five are its major victims. The Plasmodium parasite that causes malaria in humans is transmitted through the bites of infected mosquitoes. Once inside the human body, the parasite initially develops in the liver and subsequently, upon release, infects red blood cells. After infecting host red blood cells, a rapid growth ensues, supported by the parasite’s consumption of hemoglobin, the oxygen-transporting protein that constitutes a massive 90% of the total protein present inside each red blood cell.

Destruction on this scale releases large quantities of heme, the prosthetic group responsible for oxygen transport in hemoglobin. Free heme is extremely damaging and to protect itself from this toxic onslaught, the parasite utilizes a novel mechanism where it rapidly converts heme into a crystalline material known as hemozoin.

... more about:
»HDP »Plasmodium »Protein »Target »VBI »heme »hemozoin

Dr. Dharmendar Rathore, Assistant Professor at VBI, remarked: “We discovered HDP as part of a functional genomics initiative that is focused on the identification of malaria proteins involved in disease pathology. A combination of cellular and biochemical approaches allowed us to rigorously characterize HDP. It appears that HDP has a number of striking features that make it a promising candidate as a drug target.

HDP is not only capable of rapidly converting heme into its non-toxic counterpart hemozoin, but it is highly conserved in all the species of the parasite and also appears to be critical for its survival.” He added: “The beauty of this discovery is that, while HDP has robust interactions with heme, it lacks homology to any of the known heme-binding proteins and has therefore eluded detection during previous attempts by several groups to identify parasite factors responsible for hemozoin formation.”

The conversion of heme into hemozoin is regarded as one of the weakest links in the lifecycle of the Plasmodium parasite. For example, chloroquine, the most widely used malaria drug, works by interacting with heme and preventing its detoxification into hemozoin. However drugs are not yet available that target any of the parasite-specific molecules involved in this process.

Dr. Rana Nagarkatti, research scientist at VBI, commented: “The identification of new drug targets is an essential step in the development of next-generation drugs for treating malaria. Drugs that specifically interact with HDP and inhibit its detoxification activities could potentially have drastic effects on the viability of the malaria parasite.” Dr. Dewal Jani, a member of the VBI research team, remarked: “The identification of HDP fills an important gap in our understanding of the mechanism of hemozoin production in the malaria parasite. We have also established the route by which the HDP is transported out of Plasmodium and into the red blood cell before it subsequently returns to the parasite food vacuole where hemozoin is synthesized. This gives us an interesting insight into the inner workings of the parasite.”

Dr. Rathore concluded: “New drugs are urgently needed to address the huge public health burden posed by malaria across the globe. We have recently undertaken a high-throughput screening of chemical libraries to identify compounds that can inhibit the activity of HDP. Several lead compounds were identified and have been characterized in our laboratory at VBI and subsequently validated at the Swiss Tropical Institute in Basel, Switzerland. We see considerable potential in developing these lead compounds into new drugs that can act by blocking the function of HDP in the parasite.”

Otto Folkerts, Associate Director of Technology Development at VBI, added: “Virginia Tech Intellectual Properties Inc. has filed patents that cover the intellectual property behind this discovery. We are actively seeking partners who are interested in licensing this intellectual property or jointly pursuing the development of potential malaria drug candidates that may arise from this work.”

Barry Whyte | EurekAlert!
Further information:
http://www.vbi.vt.edu

Further reports about: HDP Plasmodium Protein Target VBI heme hemozoin

More articles from Life Sciences:

nachricht Fine organic particles in the atmosphere are more often solid glass beads than liquid oil droplets
21.04.2017 | Max-Planck-Institut für Chemie

nachricht Study overturns seminal research about the developing nervous system
21.04.2017 | University of California - Los Angeles Health Sciences

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

Im Focus: Quantum-physical Model System

Computer-assisted methods aid Heidelberg physicists in reproducing experiment with ultracold atoms

Two researchers at Heidelberg University have developed a model system that enables a better understanding of the processes in a quantum-physical experiment...

Im Focus: Glacier bacteria’s contribution to carbon cycling

Glaciers might seem rather inhospitable environments. However, they are home to a diverse and vibrant microbial community. It’s becoming increasingly clear that they play a bigger role in the carbon cycle than previously thought.

A new study, now published in the journal Nature Geoscience, shows how microbial communities in melting glaciers contribute to the Earth’s carbon cycle, a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

7th International Conference on Crystalline Silicon Photovoltaics in Freiburg on April 3-5, 2017

03.04.2017 | Event News

 
Latest News

New quantum liquid crystals may play role in future of computers

21.04.2017 | Physics and Astronomy

A promising target for kidney fibrosis

21.04.2017 | Health and Medicine

Light rays from a supernova bent by the curvature of space-time around a galaxy

21.04.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>