A unique molecular basis for enzyme mistargeting in primary hyperoxaluria type 1.
CLINICA CHIMICA ACTA
39 - 50.
The intermediary metabolic enzyme alanine:glyoxylate aminotransferase (AGT) is normally targeted to the peroxisomes in human liver cells. However, in a third of patients suffering from the autosomal recessive disease primary hyperoxaluria type 1 (PH1), AGT is mistargeted to the mitochondria. Such organelle-to-organelle mistargeting is without parallel in human genetic disease. AGT mistargeting results from the combination of a common Proll --> Leu polymorphism and a rare Gly170 --> Arg mutation. The former generates a functionally weak mitochondrial targeting sequence (MTS) while the latter, in combination with the former, increases the efficiency of this MTS by slowing the rate at which AGT dimerises. The fact that the intracellular compartmentation of AGT can be determined, at least in part, by its oligomeric status highlights the fundamental differences in the molecular requirements for protein import into two intracellular organelles - the peroxisomes and mitochondria. (C) 1997 Elsevier Science B.V.
|Title:||A unique molecular basis for enzyme mistargeting in primary hyperoxaluria type 1|
|Location:||ROBINSON COLL, CAMBRIDGE, ENGLAND|
|Keywords:||alanine : glyoxylate aminotransferase, peroxisomes, mitochondria, primary hyperoxaluria type 1, mistargeting, ALANINE-GLYOXYLATE AMINOTRANSFERASE, PEROXISOMAL TARGETING SIGNAL, 3-KETOACYL-COA THIOLASE, HEPATIC ALANINE, POINT MUTATION, BIOGENESIS, MITOCHONDRIA, PROTEIN, TRANSLOCATION, IMPORT|
|UCL classification:||UCL > School of Life and Medical Sciences
UCL > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > School of Life and Medical Sciences > Faculty of Medical Sciences
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