Science. 1992 Feb 7;255(5045):728-30.

Processing of the amyloid protein precursor to potentially amyloidogenic derivatives.

Golde TE, Estus S, Younkin LH, Selkoe DJ, Younkin SG.

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Division of Neuropathology, Case Western Reserve University School of Medicine, Cleveland, OH 44106.

Abstract

The approximately 120-kilodalton amyloid beta protein precursor (beta APP) is processed into a complex set of 8- to 12-kilodalton carboxyl-terminal derivatives that includes potentially amyloidogenic forms with the approximately 4-kilodalton amyloid beta protein (beta AP) at or near their amino terminus. In order to determine if these derivatives are processed in a secretory pathway or by the endosomal-lysosomal system, (i) deletion mutants that produce the normal set of carboxyl-terminal derivatives and shortened secreted derivatives were analyzed and (ii) the effect of inhibitors of endosomal-lysosomal processing was examined. In the secretory pathway, cleavage of the beta APP occurs at a single site within the beta AP to generate one secreted derivative and one nonamyloidogenic carboxyl-terminal fragment, whereas, in the endosomal-lysosomal system, a complex set of carboxyl-terminal derivatives is produced that includes the potentially amyloidogenic forms.

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Science. 1992 Feb 7;255(5045):688-9.

PMID:: 1738847; [PubMed - indexed for MEDLINE]

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