Two‐dimensional crystals of carboxysome shell proteins recapitulate the hexagonal packing of three‐dimensional crystals |
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| Authors: | Kelly A. Dryden Christopher S. Crowley Shiho Tanaka Todd O. Yeates Mark Yeager |
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| Affiliation: | 1. Department of Molecular Physiology and Biological Physics, University of Virginia Health System, Charlottesville, Virginia 22908;2. Kelly A. Dryden and Christopher S. Crowley contributed equally to this work.;3. Molecular Biology Institute, University of California, Los Angeles, California 90095;4. Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095;5. Department of Cell Biology, The Scripps Research Institute, La Jolla, California 92037 |
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| Abstract: | ![]()
Bacterial microcompartments (BMCs) are large intracellular bodies that serve as simple organelles in many bacteria. They are proteinaceous structures composed of key enzymes encapsulated by a polyhedral protein shell. In previous studies, the organization of these large shells has been inferred from the conserved packing of the component shell proteins in two‐dimensional (2D) layers within the context of three‐dimensional (3D) crystals. Here, we show that well‐ordered, 2D crystals of carboxysome shell proteins assemble spontaneously when His‐tagged proteins bind to a monolayer of nickelated lipid molecules at an air–water interface. The molecular packing within the 2D crystals recapitulates the layered hexagonal sheets observed in 3D crystals. The results reinforce current models for the molecular design of BMC shells. |
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| Keywords: | protein assembly electron microscopy image analysis two‐dimensional crystallography carboxysomes BMC protein |
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