Direct evidence for nuclear and cytoplasmic colocalization of proteasomes (multiprotease complexes) in liver.

Abstract:

:Subcellular localization of the large multicatalytic protease complexes called proteasomes, which have been found in soluble fractions of various cells, was examined by biochemical, immunological, and immunohistological methods. Rat liver nuclei, purified by two different procedures, showed high activities for degrading [3H]methylcasein and various fluorogenic oligopeptides with neutral and weakly alkaline pH optima. On gel filtration, all of these peptidase activities were recovered in a single peak with the unusually large molecular weight of about 600,000. Properties of the proteolytic activity in crude extracts of the nucleus and the cytoplasm were very similar. Immunoelectrophoretic blot analysis showed the presence of appreciable concentrations of proteasomes with similar immunoreactivity in isolated nuclear and cytosolic fractions. Moreover, immunohistochemical staining of human liver showed that proteasomes were predominantly localized in the nuclear matrix but also were present diffusely in the cytoplasm of hepatocytes. These findings indicate the nuclear and cytoplasmic colocalization of proteasomes.

journal_name

J Cell Physiol

authors

Tanaka K,Kumatori A,Ii K,Ichihara A

doi

10.1002/jcp.1041390107

subject

Has Abstract

pub_date

1989-04-01 00:00:00

pages

34-41

issue

1

eissn

0021-9541

issn

1097-4652

journal_volume

139

pub_type

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