Proteasomal RNase activity in human epidermis.
In Vivo
; 12(2): 155-8, 1998.
Article
en En
| MEDLINE
| ID: mdl-9627796
The proteasome is a cytoplasmic high-molecular-weight structure composed of several smaller protein and RNA subunits. It has been associated with non-lysosomal pathways of intracellular degradation, expressing multicatalytic proteinase activities and specific RNase activity. By standard methods, we have isolated andpartially purified proteasomes from human epidermis. We obtained the expected multiple 24-32 kDa subunits by SDS-PAGE, and evidence of RNA. Proteasomes degraded casein, as well as chromogens for t-PA and trypsin but not for chymotrypsin, these proteolytic activities overlap, but do not coincide with those observed in other organs. We found that human epidermal 28 S and 18 S rRNAs were degraded, but yeast RNA was not. By means of zymography, we demonstrated, for the first time, that RNase activity persists after dissociation of the proteasome on the gel and that it co-localizes to the same range of molecular weight subunits as the proteinase activity.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Ribonucleasas
/
Cisteína Endopeptidasas
/
Epidermis
/
Complejos Multienzimáticos
Límite:
Humans
Idioma:
En
Revista:
In Vivo
Asunto de la revista:
NEOPLASIAS
Año:
1998
Tipo del documento:
Article
País de afiliación:
Estados Unidos
Pais de publicación:
Grecia