Interaction of adenosine nucleotide analogs with Saccharomyces cerevisiae phosphoenolpyruvate carboxykinase

Loreto Carrasco, Fernando D. González, Emilio Cardemil

Resultado de la investigación: Contribución a una revistaArtículo

5 Citas (Scopus)

Resumen

The substrate characteristics and interactions of different adenosine nucleotide analogs with Saccharomyces cerevisiae phosphoenolpyruvate (PEP) carboxykinase were investigated by steady-state kinetic analysis and calculations of interaction energies. Comparison of V(max)/K(m) values showed that analogs substituted at C8 in the adenine ring (8-Br-ATP, 8-N3-ATP, 8-N3-ADP) gave almost the same kinetic values as ATP and ADP, whereas those substituted in the ribose hydroxyls (3'(2')-O-(N-methylanthraniloyl)-ATP (MANT-ATP), 3'(2')-O-(N-methylanthraniloyl)-ADP (MANT-ADP), 2'(3')-O-(2,4,6-trinitrophenyl)-ADP (TNP-ADP), 2'(3')-O-(2,4,6-trinitrophenyl)-ATP (TNP-ATP)) showed 1-8% the value for the corresponding physiological substrate. A comparison between the experimental results and molecular mechanics calculations was performed, employing a model for the S. cerevisiae PEP carboxykinase-ATP-Mn2+ complex. The calculated interaction energies of S. cerevisiae PEP carboxykinase with ATP, MANT-ATP, TNP-ATP, 8-Br-ATP, and 8-N3-ATP were linearly related (correlation coefficient 0.92) with -ln(V(max)/K(m)). This good correlation supports the proposal that the interaction of the substituent with the enzyme affects the interaction of the common region of ATP with the active site, thus leading to effects in V(max). Copyright (C) 1998 Elsevier Science B.V.

Idioma originalInglés
Páginas (desde-hasta)93-101
Número de páginas9
PublicaciónBiochimica et Biophysica Acta - Protein Structure and Molecular Enzymology
Volumen1429
N.º1
DOI
EstadoPublicada - 8 dic 1998

Áreas temáticas de ASJC Scopus

  • Biología estructural
  • Biofísica
  • Bioquímica
  • Biología molecular

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