Theoretical Study of the Initial Stages of Self-Assembly of a Carboxysome’s Facet

Mahalik, J. P.; Brown, Kirsten A.; Cheng, Xiaolin; Fuentes-Cabrera, Miguel

doi:10.1021/acsnano.5b07805

Title: Theoretical Study of the Initial Stages of Self-Assembly of a Carboxysome’s Facet

Journal Article · Tue Feb 23 23:00:00 EST 2016 · ACS Nano

DOI: https://doi.org/10.1021/acsnano.5b07805 · OSTI ID:1240572

Mahalik, J. P. ^[1]; Brown, Kirsten A. ^[2]; Cheng, Xiaolin ^[3]; Fuentes-Cabrera, Miguel ^[4]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computer Science and Mathematics Division
Mercer Univ., Macon, GA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). UT/ORNL Center for Molecular Biophysics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science and Computer Science and Mathematics Division

Bacterial microcompartments, BMCs, are organelles that exist within wide variety of bacteria and act as nanofactories. Among the different types of known BMCs, the carboxysome has been studied the most. The carboxysome plays an important role in the light-independent part of the photosynthesis process, where its icosahedral-like proteinaceous shell acts as a membrane that controls the transport of metabolites. Although a structural model exists for the carboxysome shell, it remains largely unknown how the shell proteins self-assemble. Understanding the self-assembly process can provide insights into how the shell affects the carboxysome s function and how it can be modified to create new functionalities, such as artificial nanoreactors and artificial protein membranes. Here, we explain a theoretical framework that employs Monte Carlo simulations with a coarse-grain potential that reproduces well the atomistic potential of mean force; employing this framework, we are able to capture the initial stages of the 2D self-assembly of CcmK2 hexamers, a major protein-shell component of the carboxysome's facet. The simulations reveal that CcmK2 hexamers self-assemble into clusters that resemble what was seen experimentally in 2D layers. Further analysis of the simulation results suggests that the 2D self-assembly of carboxysome s facets is driven by a nucleation growth process, which in turn could play an important role in the hierarchical self- assembly of BMC shells in general.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS) (SC-27)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1240572

Journal Information:: ACS Nano, Journal Name: ACS Nano; ISSN 1936-0851

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Theoretical Study of the Initial Stages of Self-Assembly of a Carboxysome’s Facet

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References (48)

Cited By (11)

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