Effects of a buried cysteine-to-serine mutation on yeast triosephosphate isomerase structure and stability

Alejandra Hernández-Santoyo, Lenin Domínguez-Ramírez, César A. Reyes-López, Edith González-Mondragón, Andrés Hernández-Arana, Adela Rodríguez-Romero

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

6 Citas (Scopus)

Resumen

All the members of the triosephosphate isomerase (TIM) family possess a cystein residue (Cys126) located near the catalytically essential Glu165. The evolutionarily conserved Cys126, however, does not seem to play a significant role in the catalytic activity. On the other hand, substitution of this residue by other amino acid residues destabilizes the dimeric enzyme, especially when Cys is replaced by Ser. In trying to assess the origin of this destabilization we have determined the crystal structure of Saccharomyces cerevisiae TIM (ScTIM) at 1.86 Å resolution in the presence of PGA, which is only bound to one subunit. Comparisons of the wild type and mutant structures reveal that a change in the orientation of the Ser hydroxyl group, with respect to the Cys sulfhydryl group, leads to penetration of water molecules and apparent destabilization of residues 132-138. The latter results were confirmed by means of Molecular Dynamics, which showed that this region, in the mutated enzyme, collapses at about 70 ns.

Idioma originalInglés
Páginas (desde-hasta)10010-10021
Número de páginas12
PublicaciónInternational Journal of Molecular Sciences
Volumen13
N.º8
DOI
EstadoPublicada - ago. 2012

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