Download MendeleyX-ray crystallographic and kinetic correlation of a clinically observed human fumarase mutation.
Estevez, M., Skarda, J., Spencer, J., Banaszak, L., Weaver, T.M.(2002) Protein Sci 11: 1552-1557
- PubMed: 12021453
- DOI: https://doi.org/10.1110/ps.0201502
- Primary Citation of Related Structures:
1KQ7 - PubMed Abstract:
Fumarase catalyzes the reversible conversion of fumarate to S- malate during the operation of the ubiquitous Kreb's cycle. Previous studies have shown that the active site includes side chains from three of the four subunits within the tetrameric enzyme. We used a clinically observed human mutation to narrow our search for potential catalytic groups within the fumarase active site. Offspring homozygous for the missense mutation, a G-955-C transversion in the fumarase gene, results in the substitution of a glutamine at amino acid 319 for the normal glutamic acid. To more fully understand the implications of this mutation, a single-step site-directed mutagenesis method was used to generate the homologous substitution at position 315 within fumarase C from Escherichia coli. Subsequent kinetic and X-ray crystal structure analyses show changes in the turnover number and the cocrystal structure with bound citrate.
Organizational Affiliation:
Johns Hopkins University, School of Medicine, Department of Neuroscience, Baltimore, Maryland 21205, USA.
