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 Physioljournal_title
Journal of cellular physiologyauthors
Tanaka K,Kumatori A,Ii K,Ichihara Adoi
10.1002/jcp.1041390107subject
Has Abstractpub_date
1989-04-01 00:00:00pages
34-41issue
1eissn
0021-9541issn
1097-4652journal_volume
139pub_type
杂志文章abstract::Sulfogalactosylglycerolipid (SGG) is the major mammalian male germ cell glycolipid and has been implicated in sperm/egg binding. Mycoplasma pulmonis, a species of Mollicutes, is associated with male infertility in rodents. Purified SGG incubated in the presence of M. pulmonis was enzymatically degraded by both desulfa...
journal_title:Journal of cellular physiology
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doi:10.1002/jcp.1041420121
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journal_title:Journal of cellular physiology
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abstract::These are the reflections of a retired physician who was introduced to cellular physiology in 1947 at the University of Pennsylvania. I majored in Zoology. I took the required major courses, which were interesting but not exciting. I was a premedical student at the time. Fortunately I was introduced to cellular physio...
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journal_title:Journal of cellular physiology
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abstract::The growth of human epithelial cells is stimulated by cholera toxin and analogues of cyclic AMP, while the growth of breast derived fibroblasts is inhibited. These compounds have little effect on DNA synthesis in the absence of other mitogens but show a synergistic effect with serum and/or EGF. The results suggest tha...
journal_title:Journal of cellular physiology
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更新日期:2014-12-01 00:00:00
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journal_title:Journal of cellular physiology
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doi:10.1002/jcp.1041390314
更新日期:1989-06-01 00:00:00
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journal_title:Journal of cellular physiology
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更新日期:2018-01-31 00:00:00
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更新日期:2015-09-01 00:00:00
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更新日期:2001-03-01 00:00:00
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更新日期:1994-02-01 00:00:00