Kinesin-mediated axonal transport of a membrane compartment containing β-secretase and presenilin-1 requires APP

Adeela Kamal, Angels Almenar-Queralt, James F. LeBlanc, Elizabeth A. Roberts and Lawrence S. B. Goldstein ()
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Adeela Kamal: School of Medicine, University of California San Diego
Angels Almenar-Queralt: School of Medicine, University of California San Diego
James F. LeBlanc: Ciphergen Biosystems Inc.
Elizabeth A. Roberts: School of Medicine, University of California San Diego
Lawrence S. B. Goldstein: School of Medicine, University of California San Diego

Nature, 2001, vol. 414, issue 6864, 643-648

Abstract: Abstract Proteolytic processing of amyloid precursor protein (APP) generates amyloid-β peptide and has been implicated in the pathogenesis of Alzheimer's disease1. However, the normal function of APP, whether this function is related to the proteolytic processing of APP, and where this processing takes place in neurons in vivo remain unknown. We have previously shown that the axonal transport of APP in neurons is mediated by the direct binding of APP to the kinesin light chain subunit of kinesin-I, a microtubule motor protein2. Here we identify an axonal membrane compartment that contains APP, β-secretase and presenilin-1. The fast anterograde axonal transport of this compartment is mediated by APP and kinesin-I. Proteolytic processing of APP can occur in the compartment in vitro and in vivo in axons. This proteolysis generates amyloid-β and a carboxy-terminal fragment of APP, and liberates kinesin-I from the membrane. These results suggest that APP functions as a kinesin-I membrane receptor, mediating the axonal transport of β-secretase and presenilin-1, and that processing of APP to amyloid-β by secretases can occur in an axonal membrane compartment transported by kinesin-I.

Date: 2001
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DOI: 10.1038/414643a

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