A unique molecular basis for enzyme mistargeting in primary hyperoxaluria type 1

Leiper, J. M. and Danpure, C. J. (1997) A unique molecular basis for enzyme mistargeting in primary hyperoxaluria type 1. Clinica Chimica Acta, 266(1), pp. 39-50. (doi: 10.1016/S0009-8981(97)00165-4) (PMID:9435987)

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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 Pro → Leu polymorphism and a rare Gly170→Arg mutation. The former generates a functionally 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.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Leiper, Professor James
Authors: Leiper, J. M., and Danpure, C. J.
College/School:College of Medical Veterinary and Life Sciences > Institute of Cardiovascular and Medical Sciences
Journal Name:Clinica Chimica Acta
ISSN (Online):1873-3492

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