Physiological correlation between nucleoside-diphosphate kinase and the enzyme-associated guanine nucleotide binding proteins.
Biochem Biophys Res Commun
; 143(2): 552-9, 1987 Mar 13.
Article
en En
| MEDLINE
| ID: mdl-3032173
The physiological correlation between NDP-kinase and the enzyme-associated guanine nucleotide binding proteins (G1 and G2) has been studied in vitro. It was found that incubation of the phosphoenzyme (enzyme-bound high-energy phosphate intermediate) of NDP-kinases with one of the nucleoside 5'-diphosphates (NDPs) in the presence of divalent cations (Mg2+ and Ca2+) results in the formation of nucleoside 5'-triphosphates (NTPs) within 40 sec even at low temperatures (below 4 degrees C) without strict base-specificity; and high-energy phosphates on the phosphoenzyme can transfer preferentially to GDP on the guanine nucleotide binding proteins (G1, G2 and r-p21 protein) in the presence of 0.25 mM Ca2+ or 1 mM Mg2+ even if any other NDPs are present in the reaction mixtures. These observations suggest that NDP-kinase may be responsible for the phosphate-transfer between GDP on the guanine nucleotide binding proteins and its phosphoenzyme.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Fosfoproteínas
/
Fosfotransferasas
/
Nucleósido-Difosfato Quinasa
/
Proteínas de Unión al GTP
Tipo de estudio:
Risk_factors_studies
Límite:
Animals
Idioma:
En
Revista:
Biochem Biophys Res Commun
Año:
1987
Tipo del documento:
Article