Cellular and Molecular Life Sciences

, Volume 66, Issue 14, pp 2299–2318

Amyloid precursor protein and its homologues: a family of proteolysis-dependent receptors


DOI: 10.1007/s00018-009-0020-8

Cite this article as:
Jacobsen, K.T. & Iverfeldt, K. Cell. Mol. Life Sci. (2009) 66: 2299. doi:10.1007/s00018-009-0020-8


The Alzheimer’s amyloid precursor protein (APP) belongs to a conserved gene family that also includes the mammalian APLP1 and APLP2, the Drosophila APPL, and the C. elegans APL-1. The biological function of APP is still not fully clear. However, it is known that the APP family proteins have redundant and partly overlapping functions, which demonstrates the importance of studying all APP family members to gain a more complete picture. When APP was first cloned, it was speculated that it could function as a receptor. This theory has been further substantiated by studies showing that APP and its homologues bind both extracellular ligands and intracellular adaptor proteins. The APP family proteins undergo regulated intramembrane proteolysis (RIP), generating secreted and cytoplasmic fragments that have been ascribed different functions. In this review, we will discuss the APP family with focus on biological functions, binding partners, and regulated processing.


Alzheimer’s diseaseAmyloid-βAPP familyAPP intracellular domainInsulin-like growth factorSecretasesRegulated intramembrane proteolysis

Copyright information

© Birkhäuser Verlag, Basel/Switzerland 2009

Authors and Affiliations

  1. 1.Department of NeurochemistryStockholm UniversityStockholmSweden