| Registro completo |
| Provedor de dados: |
Biol. Res.
|
| País: |
Chile
|
| Título: |
Biochemical characterization and inhibitory effects of dinophysistoxin-1, okadaic acid and microcystine l-r on protein phosphatase 2a purified from the mussel Mytilus chilensis.
|
| Autores: |
RIVAS,MARIELLA
GARCÍA,CARLOS
LIBERONA,JOSÉ L
LAGOS,NÉSTOR
|
| Data: |
2000-01-01
|
| Ano: |
2000
|
| Palavras-chave: |
Chile
Diarrhetic Shellfish Poisoning (DSP)
Mussel
Mytilus chilensis
Protein Phosphatase 2A
Microcystine L-R
|
| Resumo: |
Protein phosphatases are involved in many cellular processes. One of the most abundant and best studied members of this class is protein phosphatase type-2A (PP2A). In this study, PP2A was purified from the mussel Mytilus chilensis. Using both SDS-PAGE and size exclusion gel filtration under denaturant conditions, it was confirmed that the PP2A fraction was essentially pure. The isolated enzyme is a heterodimer and the molecular estimated masses of the subunits are 62 and 28 kDa. The isolated PP2A fraction has a notably high p-NPP phosphatase activity, which is inhibited by NaCl. The hydrolytic p-NPP phosphatase activity is independent of the MgCl2 concentration. The time courses of the inhibition of the PP2A activity of p-NPP hydrolysis by increasing concentrations of three phycotoxins that are specific inhibitors of PP2A are shown. Inhibitions caused by Okadaic acid, dinophysistoxin-1 (DTX1, 35-methylokadiac acid) and Microcystine L-R are dose-dependent with inhibition constants (Ki) of 1.68, 0.40 and 0.27 nM respectively. Microcystine L-R, the most potent phycotoxin inhibitor of PP2A isolated from Mytilus chilensis with an IC50 = 0.25 ng/ml, showed the highest specific inhibition effect an the p-NPP hydrolisis. The calculated IC50 for DTX1 and OA was 0.75 ng/ml and 1.8 ng/ml respectively.
|
| Tipo: |
Journal article
|
| Idioma: |
Inglês
|
| Identificador: |
http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000300005
|
| Editor: |
Sociedad de Biología de Chile
|
| Formato: |
text/html
|
| Fonte: |
Biological Research v.33 n.3-4 2000
|
|
