Localization of subunits in proteasomes from Thermoplasma acidophilum by 
immunoelectron microscopy

Grziwa, A.; Baumeister, W.; Dahlmann, B.; Kopp, F.

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Localization of subunits in proteasomes from Thermoplasma acidophilum by immunoelectron microscopy

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Grziwa, A., Baumeister, W., Dahlmann, B., & Kopp, F. (1991). Localization of subunits in proteasomes from Thermoplasma acidophilum by immunoelectron microscopy. FEBS Letters., 290(1-2), 186-190.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0010-743F-F

Abstract

The subunit topography of the Thermoplasma acidophilum proteasome was determined by immunoelectron microscopy using monospecific antibodies directed against the two constituent subunits (alpha,beta). Anti-alpha-subunit IgG was found to bind to the outer disks of the cylinder- or barrel-shaped molecule, while the binding sites of the anti-beta-subunit IgG were mapped on the two inner rings. Probably the homologues of the two subunits in the compositionally more complex but isomorphous eukaryotic proteasomes occupy equivalent positions.