de.mpg.escidoc.pubman.appbase.FacesBean
English
 
Help Guide Disclaimer Contact us Login
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Proteasomes from Dictyostelium discoideum: characterization of structure and function

MPS-Authors
There are no MPG-Authors available
Locator
There are no locators available
Fulltext (public)
There are no public fulltexts available
Supplementary Material (public)
There is no public supplementary material available
Citation

Schauer, T. M., Nesper, M., Kehl, M., Lottspeich, F., Müller-Taubenberger, A., Gerisch, G., et al. (1993). Proteasomes from Dictyostelium discoideum: characterization of structure and function. Journal of Structural Biology., 111(2), 135-147.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-73C7-3
Abstract
We have isolated and purified 20 S proteasomes from Dictyostelium discoideum and characterized their proteolytic activities. Two-dimensional electrophoresis revealed 13 distinct spots. Affinity purification with a subunit-specific monoclonal antibody indicated that the preparation was homogeneous, i.e., each individual proteasome appeared to have the full set of subunits. We have not obtained any evidence for changes in subunit composition at different developmental stages. The cDNA clones coding for two subunits (4 and 5), both of the alpha-type, have been cloned and sequenced. It has been shown by immunoelectron microscopy that each proteasome is composed of two identical halves, related to each other by C2 symmetry. The resulting model implies that the alpha- and beta-subunits have a fixed pattern of relationships. D. discoideum proteasomes are found both in the cytosol and, in higher concentrations, in the nucleus.