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Istituto di scienza dell'alimentazione

Torna all'elenco Contributi in rivista anno 2006

Contributo in rivista

Tipo: Articolo in rivista

Titolo: Binding of glucose to the D-galactose/D-glucose-binding protein from Escherichia coli restores the native protein secondary structure and the thermostability that are lost upon calcium depletion.

Anno di pubblicazione: 2006

Autori: D'Auria S., Ausili A., Varriale A., Scognamiglio V., Staiano M., Bertoli E., Rossi M., Tanfani F.

Autori CNR:

  • SABATO D'AURIA
  • ANNA MARABOTTI
  • ANNA MARABOTTI
  • MOSè ROSSI
  • VIVIANA SCOGNAMIGLIO
  • MARIA STAIANO
  • ANTONIO VARRIALE

Abstract: The effect of the depletion of calcium on the structure and thermal stability of the D-galactose/D-glucose–binding protein (GGBP) from Escherichia coli was studied by fluorescence spectroscopy and Fourier-transform infrared spectroscopy. The calciumdepleted protein (GGBP-Ca) was also studied in the presence of glucose (GGBP-Ca/Glc). The results show that calcium depletion has a small effect on the secondary structure of GGBP, and, in particular it affects a population of a-helices with a low exposure to solvent. Alternatively, glucose-binding to GGBP-Ca eliminates the effect induced by calciumdepletion byrestoring a secondary structure similar to that of the native protein. In addition, the infrared and fluorescence data obtained reveal that calcium depletion markedly reduces the thermal stability of GGBP.In particular, the spectroscopic experiments show that the depletion of calcium mainly affects the stability of the C-terminal domain of the protein. However, the binding of glucose restores the thermal stability of GGBP-Ca. The thermostability of GGBP and GGBP-Ca was also studied by molecular dynamics simulations. The simulation data support the spectroscopic results. New insights into the role of calcium in the thermal stability of GGBP contribute to a better understanding of the protein function and constitute important information for the development of biotechnological applications of this protein. Mutations and/or labelling ofaminoacidresidueslocated intheproteinC-terminaldomainmayaffectthestability of the whole protein structure.

Pagine da: 213

Pagine a: 221

Rivista:

Journal of Biochemistry Japanese Biochemical Society in association with Oxford University Press
Paese di pubblicazione: Giappone
Lingua: inglese
ISSN: 0021-924X

Numero volume: 139

Altre informazioni: 5

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