Download MendeleyStructural implications of a G170R mutation of alanine:glyoxylate aminotransferase that is associated with peroxisome-to-mitochondrion mistargeting.
Djordjevic, S., Zhang, X., Bartlam, M., Ye, S., Rao, Z., Danpure, C.J.(2010) Acta Crystallogr Sect F Struct Biol Cryst Commun 66: 233-236
- PubMed: 20208150
- DOI: https://doi.org/10.1107/S1744309109054645
- Primary Citation of Related Structures:
1J04 - PubMed Abstract:
In a subset of patients with the hereditary kidney-stone disease primary hyperoxaluria type 1 (PH1), the liver-specific enzyme alanine:glyoxylate aminotransferase (AGT) is mistargeted from peroxisomes to mitochondria. This is a consequence of the combined presence of the common P11L polymorphism and a disease-specific G170R mutation. In this paper, the crystal structure of mutant human AGT containing the G170R replacement determined at a resolution of 2.6 A is reported. The crystal structure of AGT consists of an intimate dimer in which an extended N-terminal segment of 21 amino acids from one subunit wraps as an elongated irregular coil around the outside of the crystallographic symmetry-related subunit. In addition to the N-terminal segment, the monomer structure contains a large domain of 261 amino acids and a small C-terminal domain of 110 amino acids. Comparison of the mutant AGT structure and that of wild-type normal AGT shows that the two structures are almost identical, with a backbone-atom r.m.s. deviation of 0.34 A. However, evidence of significant local structural changes in the vicinity of the G170R mutation might be linked to the apparent decrease in protein stability.
- Structural and Molecular Biology, University College London, Gower Street, London WC1E 6BT, England.
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