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Structure and Assembly of Clathrin Cages

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Macromolecular Protein Complexes

Part of the book series: Subcellular Biochemistry ((SCBI,volume 83))

Abstract

The unusual structure of clathrin, combined with its ability to assemble and disassemble rapidly in cells provides a model system for us to learn about the ways in which proteins can contribute mechanically to a functioning cell. In this article, we discuss the structural properties of clathrin cages and the triskelions which assemble to form them. The function of clathrin depends on the structure of these triskelions and the interactions they make both with each other during assembly and with the adaptor protein network that drives coated vesicle formation. The atomic resolution structure of clathrin domains has been revealed by X-ray crystallography while scattering studies have enabled the shape of a triskelion in solution to be deduced. Cryo-electron microscopy maps have shown the secondary structure of entire cages, how individual triskelion legs are arranged to form a cage and enabled some bound adaptor proteins to be located. Cage formation itself is energetically finely balanced and requires specific interactions between triskelion legs to be productive, as biochemical studies and in silico modeling have shown. Theoretical, structural and cell biological investigations over many years have contributed to our knowledge of clathrin structure and assembly. It now remains to determine the precise nature of the interactions which occur between clathrin triskelions, light chain and heavy chain and the adaptor protein network.

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Acknowledgements

C.J.S and K.M gratefully acknowledge BBSRC grant (BB/K003461/1). M.H thanks the Medical Research Council for support. Molecular graphics figures were performed using the UCSF Chimera package. Chimera is developed by the Resource for Biocomputing, Visualization, and Informatics at the University of California, San Francisco (supported by NIGMS P41-GM103311).

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Correspondence to Corinne Smith .

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© 2017 Springer International Publishing Switzerland

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Halebian, M., Morris, K., Smith, C. (2017). Structure and Assembly of Clathrin Cages. In: Harris, J., Marles-Wright, J. (eds) Macromolecular Protein Complexes. Subcellular Biochemistry, vol 83. Springer, Cham. https://doi.org/10.1007/978-3-319-46503-6_20

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