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Abstract:

Saccharomyces cerevisiae pyruvate kinase 1 (Pyk1) was demonstrated to be associated to an immunoprecipitate of yeast protein kinase A holoenzyme (HA. Tpk1-Bcy1) and to be phosphorylated in a cAMP-dependent process. Both glutathione S-transferase (GST)-Pyk1 and GST-Pyk2 were phosphorylated in vitro by the bovine heart protein kinase A (PKA) catalytic subunit and by immobilized yeast HA-Tpk1. The specificity constant for the phosphorylation of GST-Pyk1 and GST-Pyk2 by bovine catalytic subunit was in the range of the value for Leu-Arg-Arg-Ala-Ser-Leu-Gly (Kemptide). Both fusion proteins were phosphorylated in vivo, in intact cells overexpressing the protein, or in vitro using crude extracts, as source of protein kinase A, when a wild type strain was used but were not phosphorylated when using a strain with only one TPK gene with an attenuated mutation (tpk1w1). The effect of phosphorylation on Pyk activity was assayed in partially purified preparations from three strains, containing different endogenous protein kinase A activity levels. Pyk1 activity was measured at different phosphoenolpyruvate concentrations in the absence or in the presence of the activator fructose 1,6-bisphosphate at 1.5 mM. Preliminary kinetic results derived from the comparison of Pyk1 obtained from extracts with the highest versus those from the lowest protein kinase A activity indicate that the enzyme is more active upon phosphorylation conditions; in the absence of the activator it shows a shift in the titration curve for phosphoenolpyruvate to the left and an increase in the Hill coefficient, whereas in the presence of fructose 1,6-bisphosphate it shows an nH value of 1.4, as compared with an nH of 2 for the Pyk1 obtained from extracts with almost null protein kinase A activity.

Registro:

Documento: Artículo
Título:In vivo and in vitro phosphorylation of two isoforms of yeast pyruvate kinase by protein kinase A
Autor:Portela, P.; Howell, S.; Moreno, S.; Rossi, S.
Filiación:Laboratory of Protein Structure, National Institute for Medical Research, Ridgeway, Mill Hill, London NW7 1AA, United Kingdom
Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellón 2, Buenos Aires 1428, Argentina
Palabras clave:Catalysis; Enzyme kinetics; Enzymes; Genes; Yeast; Phosphorylation; Biochemistry; cyclic AMP; cyclic AMP dependent protein kinase; fructose 1,6 bisphosphate; glutathione transferase; hybrid protein; kemptide; phosphoenolpyruvate; pyruvate kinase; article; controlled study; enzyme active site; enzyme activity; enzyme specificity; enzyme substrate; enzyme subunit; immunoprecipitation; in vitro study; in vivo study; matrix assisted laser desorption ionization time of flight mass spectrometry; nonhuman; priority journal; protein expression; protein phosphorylation; Saccharomyces cerevisiae; strain difference; titrimetry; Animals; Cattle; Cyclic AMP-Dependent Protein Kinases; Glycolysis; Isoenzymes; Kinetics; Phosphorylation; Pyruvate Kinase; Saccharomyces cerevisiae; Bovinae; Saccharomyces; Saccharomyces cerevisiae
Año:2002
Volumen:277
Número:34
Página de inicio:30477
Página de fin:30487
DOI: http://dx.doi.org/10.1074/jbc.M201094200
Título revista:Journal of Biological Chemistry
Título revista abreviado:J. Biol. Chem.
ISSN:00219258
CODEN:JBCHA
CAS:Cyclic AMP-Dependent Protein Kinases, EC 2.7.1.37; Isoenzymes; Pyruvate Kinase, EC 2.7.1.40
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00219258_v277_n34_p30477_Portela.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219258_v277_n34_p30477_Portela

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Citas:

---------- APA ----------
Portela, P., Howell, S., Moreno, S. & Rossi, S. (2002) . In vivo and in vitro phosphorylation of two isoforms of yeast pyruvate kinase by protein kinase A. Journal of Biological Chemistry, 277(34), 30477-30487.
http://dx.doi.org/10.1074/jbc.M201094200
---------- CHICAGO ----------
Portela, P., Howell, S., Moreno, S., Rossi, S. "In vivo and in vitro phosphorylation of two isoforms of yeast pyruvate kinase by protein kinase A" . Journal of Biological Chemistry 277, no. 34 (2002) : 30477-30487.
http://dx.doi.org/10.1074/jbc.M201094200
---------- MLA ----------
Portela, P., Howell, S., Moreno, S., Rossi, S. "In vivo and in vitro phosphorylation of two isoforms of yeast pyruvate kinase by protein kinase A" . Journal of Biological Chemistry, vol. 277, no. 34, 2002, pp. 30477-30487.
http://dx.doi.org/10.1074/jbc.M201094200
---------- VANCOUVER ----------
Portela, P., Howell, S., Moreno, S., Rossi, S. In vivo and in vitro phosphorylation of two isoforms of yeast pyruvate kinase by protein kinase A. J. Biol. Chem. 2002;277(34):30477-30487.
http://dx.doi.org/10.1074/jbc.M201094200