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Biology articles
The Golden Goose Is Awarded
Salmonella Strain Spreads Alongside HIV
Fair Flu Viruses Closely Matched
Creative Emulsification
Inflammation for Regeneration
Editor's choice in microbiology
Debate Over Stem Cell Effectiveness
Editor's choice in molecular biology
Telomeres Affect Gene Expression
Re-sensitizing Resistant Bacteria
Vitamin C Slays TB Bacteria
Plant scientists, innovators
The First Plant Interactome
Plant RNAs Found in Mammals
Opinion: Beyond the Model
Sweet and Sour Science
Plant RNA Paper Questioned
Flower Barcodes
Microbial Perfume
How Plants Feel
New Databases Harvest a Rich Bounty of Information on Crop Plant Metabolism
Carnegie Institution for Science Receives Grand Challenges Explorations Grant
Genetically engineered trees could help restore devastated American chestnut
Evolution coup: study reveals how plants protect their genes
  Cracking the Plant-Cell Membrane Code
To engineer better, more productive crops and develop new drugs to combat disease, scientists look at how the sensor-laden membranes surrounding cells control nutrient and water uptake, secrete toxins, and interact with the environment and neighboring cells to affect growth and development. Remarkably little is known about how proteins interact with these protective structures. With National Science Foundation funding, researchers at the Carnegie Institution’s Department of Plant Biology are using the first high-throughput screen for any multicellular organism to pinpoint these interactions using the experimental plant Arabidopsis. They have analyzed some 3.4 million potential protein/membrane interactions and have found 65,000 unique relationships. They made the preliminary data available today to the biological community by way of the Website www.associomics.org/search.php. Since proteins are similar in all organisms, the work is relevant to fields from farming to medicine.

“This is just the beginning,” remarked Wolf Frommer director of Carnegie’s Department of Plant Biology. “Arabidopsis shares many of its genes with other organisms including humans. As the library of interacting proteins grows, scientists around the world will be able to study the details of protein interactions to understand how they are affected by forces such as climate change and disease and how they can be harnessed to produce better crops and medicines more effectively.”

All of a cell’s internal machinery relies on the binding of proteins. Complementary shaped proteins dock with one another to start processes, such as turning on a gene or letting in the proper nutrient. These membrane proteins make up some 20-30% of the proteins in Arabidopsis, a relative of the mustard plant.

The team uses a screen called the mating-based protein complementation assay, or split ubiquitin system. Ubiquitin is a small protein. The scientists fuse candidate proteins onto a version of ubiquitin that is split in half. When the two candidates interact, the two halves of the ubiquitin reassemble, triggering a process that liberates a transcription factor—a protein that switches a gene on—which then goes to the nucleus. When genes are turned on in the nucleus, the researchers are alerted to the successful interaction.

The ultimate goal is to test the 36 million potential interactions as well as the sensitivity of the interactions to small molecules with a high-throughput robotics system.The group plans to start a second round of screening at the end of this month to test another 3.4 million interactions.

This work was made possible by grants from NSF 2010 : Towards a comprehensive Arabidopsis protein interactome map: Systems biology of the membrane proteins and signalosomes (grant MCB-0618402) in addition to support from Carnegie. Other participants on the 2010 project include UCSD, Penn State and the University of Maryland. The group previously donated 2010 clones to the Arabidopsis Biological Resource Center (ABRC is at Ohio State University), and more recently another 1010 for other scientists to use to help advance fields from medicine to farming.
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Cracking the Plant-Cell Membrane Code
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Scientists Watch Cell-Shape Process for First Time
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Plant research funding crucial for the future
Wolf B. Frommer Receives Bogorad Award for Excellence in Plant Biology
Lighting up the plant hormone “command system”
Plant organ development breakthrough
Breakthrough: How salt stops plant growth
New Cancer Diagnostic Technique Debuts
Plant Science Could Ease Global Food and Fuel Demands
Have you had your cereal today?
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Researchers close in on engineering recognizable, drug-free Cannabis plant
UC Riverside Researchers Develop Genetic Map for Cowpea
New research shows how mobile DNA survives—and thrives—in plants, animals
Cucumber Genome Published
Structural study at EMBL reveals how plants respond to water shortages
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