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Mol Cell. 2000 Sep;6(3):625-36.

Requirements for presenilin-dependent cleavage of notch and other transmembrane proteins.

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1
Department of Genetics and Development, Howard Hughes Medical Institute, Columbia University, College of Physicians and Surgeons, New York, New York 10032, USA. struhl@cuccfa.ccc.columbia.edu

Abstract

Ligand binding to receptors of the LIN-12/Notch family causes at least two proteolytic cleavages: one between the extracellular and transmembrane domains, and the other within the transmembrane domain. The transmembrane cleavage depends on Presenilin, a protein also required for transmembrane cleavage of beta-APP. Here, we have assayed the substrate requirements for Presenilin-dependent processing of Notch and other type I transmembrane proteins in vivo. We find that the Presenilin-dependent cleavage does not depend critically on the recognition of particular sequences in these proteins but rather on the size of the extracellular domain: the smaller the size, the greater the efficiency of cleavage. Hence, Notch, beta-APP, and perhaps other proteins may be targeted for Presenilin-mediated transmembrane cleavage by upstream processing events that sever the extracellular domain from the rest of the protein.

PMID:
11030342
[Indexed for MEDLINE]
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