Structure of yeast triosephosphate isomerase at 1.9-A resolution. Academic Article uri icon

Overview

abstract

  • The structure of yeast triosephosphate isomerase (TIM) has been solved at 3.0-A resolution and refined at 1.9-A resolution to an R factor of 21.0%. The final model consists of all non-hydrogen atoms in the polypeptide chain and 119 water molecules, a number of which are found in the interior of the protein. The structure of the active site clearly indicates that the carboxylate of the catalytic base, Glu 165, is involved in a hydrogen-bonding interaction with the hydroxyl of Ser 96. In addition, the interactions of the other active site residues, Lys 12 and His 95, are also discussed. For the first time in any TIM structure, the "flexible loop" has well-defined density; the conformation of the loop in this structure is stabilized by a crystal contact. Analysis of the subunit interface of this dimeric enzyme hints at the source of the specificity of one subunit for another and allows us to estimate an association constant of 10(14)-10(16) M-1 for the two monomers. The analysis also suggests that the interface may be a particularly good target for drug design. The conserved positions (20%) among sequences from 13 sources ranging on the evolutionary scale from Escherichia coli to humans reveal the intense pressure to maintain the active site structure.

publication date

  • July 17, 1990

Research

keywords

  • Carbohydrate Epimerases
  • Fungal Proteins
  • Saccharomyces cerevisiae
  • Triose-Phosphate Isomerase

Identity

Scopus Document Identifier

  • 0025358007

Digital Object Identifier (DOI)

  • 10.1021/bi00480a009

PubMed ID

  • 2204417

Additional Document Info

volume

  • 29

issue

  • 28