Meissner U, Schröder E, Scheffler D, Martin AG, Harris JR. Formation, TEM study and 3D reconstruction of the human erythrocyte peroxiredoxin-2 dodecahedral higher-order assembly.
Micron 2007;
38:29-39. [PMID:
16839769 DOI:
10.1016/j.micron.2006.04.010]
[Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2004] [Revised: 04/11/2006] [Accepted: 04/12/2006] [Indexed: 11/27/2022]
Abstract
The production of a higher-order assembly of peroxiredoxin-2 (Prx-2) from human erythrocytes has been achieved during specimen preparation on holey carbon support films, in the presence of ammonium molybdate and polyethylene glycol. TEM study suggested that this assembly is a regular dodecahedron, containing 12 Prx-2 decamers (Mr 2.62 MDa, external diameter approximately 20 nm). This interpretation has been supported by production of a approximately 1.6 nm 3D reconstruction from the negative stain TEM data, with automated docking of the available X-ray data of the Prx-2 decamer. Comparison with other known protein dodecahedral and viral icosahedral structures indicates that this arrangement of protein molecules is one of the fundamental macromolecular higher-order assemblies found in biology. Widespread biotechnological interest in macromolecular "cage" structures is relevant to the production of the Prx-2 dodecahedron.
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