4FF7

Structure of C126S mutant of Saccharomyces cerevisiae triosephosphate isomerase

Summary for 4FF7

• Entry DOI: 10.2210/pdb4ff7/pdb
• Related: 1YPI
• Descriptor: Triosephosphate isomerase, 2-PHOSPHOGLYCOLIC ACID, GLYCEROL, ... (7 entities in total)
• Functional Keywords: (alfa/beta )8 barrel, isomerase, oxidoreductase
• Biological source: Saccharomyces cerevisiae (Baker's yeast)
• Total number of polymer chains: 2
• Total formula weight: 55383.90

Authors

Rodriguez-Romero, A.,Hernandez-Santoyo, A. (deposition date: 2012-05-31, release date: 2012-08-22, Last modification date: 2023-09-13)

Primary citation

Hernandez-Santoyo, A.,Dominguez-Ramirez, L.,Reyes-Lopez, C.A.,Gonzalez-Mondragon, E.,Hernandez-Arana, A.,Rodriguez-Romero, A.
Effects of a buried cysteine-to-serine mutation on yeast triosephosphate isomerase structure and stability.
Int J Mol Sci, 13:10010-10021, 2012

PubMed Abstract: 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.

PubMed: 22949845
DOI: 10.3390/ijms130810010

Experimental method

X-RAY DIFFRACTION (1.86 Å)