Images of the cell’s transport pods, produced at EMBL Heidelberg, revealed a molecular version of the robots from Transformers, published online today in Science.
These spheres may look almost identical, but subtle differences between them revealed a molecular version of the robots from Transformers. Each sphere is a vesicle, a pod that cells use to transport materials between different compartments.
Depicting each copy of COPI as a triangle, the different arrangements of these building blocks become easier to spot.
Previously, scientists had been able to create and determine the structure of ‘cages’ formed by parts of the protein coats that encase other types of vesicles, but this study, published online today in Science, was the first to obtain high-resolution images of complete vesicles, budded from a membrane.
The work was carried out in collaboration with the lab of Felix Wieland at Heidelberg University in Germany.
Contacts and sources:
Subtle differences between the structure of these vesicles revealed a molecular version of the robots from Transformers.
Credit: ©EMBL/M.Faini
These spheres may look almost identical, but subtle differences between them revealed a molecular version of the robots from Transformers. Each sphere is a vesicle, a pod that cells use to transport materials between different compartments.
Credit: ©EMBL/M.Faini
The images, produced by Marco Faini from John Briggs’ lab at the European Molecular Biology Laboratory (EMBL), in Heidelberg, Germany, are the first high-resolution view of the three-dimensional structure of such a pod. They show a particular type of vesicle that is encased by a protein called COPI, and whose structure had never been seen before.
Several copies of the COPI protein attach to each other to form a coat around the vesicle’s membrane. Briggs and colleagues were surprised to find that the COPI building blocks are capable of a ‘transformer’ act: they can change shape to connect to more or fewer copies of themselves. So by changing the shape of individual COPI blocks, the cell could create vesicles of different shapes and sizes, for instance to transport different kinds of cargo.
Several copies of the COPI protein attach to each other to form a coat around the vesicle’s membrane. Briggs and colleagues were surprised to find that the COPI building blocks are capable of a ‘transformer’ act: they can change shape to connect to more or fewer copies of themselves. So by changing the shape of individual COPI blocks, the cell could create vesicles of different shapes and sizes, for instance to transport different kinds of cargo.
Building block: a COPI protein (yellow, green, blue) on the vesicle’s membrane (red) can change shape to connect to more or fewer copies of itself, making vesicles of different sizes and shapes.
Credit: ©EMBL/M.Faini
Previously, scientists had been able to create and determine the structure of ‘cages’ formed by parts of the protein coats that encase other types of vesicles, but this study, published online today in Science, was the first to obtain high-resolution images of complete vesicles, budded from a membrane.
Clicking together: depicting each copy of COPI as a triangle, the different arrangements of these building blocks become easier to spot.
Credit: ©EMBL/M.Faini
The work was carried out in collaboration with the lab of Felix Wieland at Heidelberg University in Germany.
Contacts and sources:
Citation: Faini, M., Prinz, S., Beck, R., Schorb, M., Riches, J.D., Bacia, K., Brügger, B., Wieland, F.T. & Briggs, J.A.G. The Structures of COPI-Coated Vesicles Reveal Alternate Coatomer Conformations and Interactions. Published online in Science Express, 24 May 2012. DOI: 10.1126/science.1221443.
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