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Investigating the interactions that govern the architecture of the carboxysomal shell

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Title: Investigating the interactions that govern the architecture of the carboxysomal shell
Author: Samborska, Bozena
Department: Department of Molecular and Cellular Biology
Advisor: Kimber, Matthew
Abstract: Photosynthetic cyanobacteria optimize carbon fixation by enhancing the enzymatic activity of Rubisco through its co-encapsulation with carbonic anhydrase (CA) in proteinaceous organelle-like microcompartments called carboxysomes. Carboxysomes are large icosahedral particles that are composed of a thin outer protein shell, consisting exclusively of thousands of protein copies that collectively form this shell. The major components, CcmK1, CcmK2, and CcmK4, form hexagonal hexamers and further tile into a gapless sheet to form the facets of the shell, while pentameric CcmL occupies the vertices. To date, the interactions between the shell proteins have not been investigated biochemically. A FRET based method was developed to investigate interactions governing carboxysomal shell architecture. The shell proteins (CcmK(1,2,4)) interact interchangeably with one another, as well as with CcmL. Furthermore, CcmK2 assembles as a distinct dodecamer, and is proposed to form a double-layered shell subdomain. Additionally, the sidedness of the shell is investigated from shell-interior interaction data.
URI: https://hdl.handle.net/10214/24985
Date: 2010
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