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PROSITE documentation PDOC00204

APP E1 and E2 domains profiles and CuBD and intracellular domains signatures





Description

Alzheimer's disease (AD) is the most frequent form of progressive dementia, occurring predominantly in the elderly population. AD is characterized by the presence of amyloid plaques, extensive neuronal death and shrinkage of the brain. It is increasingly accepted that the neurotoxic β-amyloid or A4 peptide (β/A4) is responsible for compromising neuronal functions and triggering cell death. The peptide is derived from the cleavage of the amyloid precursor protein (APP) and is the main constituent of the amyloid plaques. APP belongs to a wider family of APP-like proteins (APLPs) that include APLP1 and APLP2 in mammals (see <PDOC00204>). These proteins exhibit functional redundancy to some degree and can undergo cleavage, but only APP cleavage gives rise to the β/A4 peptide. APP and APLPs are type-I transmembrane proteins with a large extracellular portion, which can be structurally and functionally subdivided into several domains. At the N-terminus is a cysteine-rich region, termed E1, consisting of the growth factor like domain (GFLD), which binds heparin and can stimulate neurite outgrowth, and a copper-binding domain (CuBD) that binds Cu and Zn. The E1 domain is followed by an acidic-rich region of sequence, a Kunitz-type protease inhibitor (KPI) domain (see <PDOC00252>) and an OX2 domain. Following these domains is a glycosylated domain referred to as E2, a region predicted to adopt no regular secondary structure and the transmembrane region. The C-terminal cytoplasmic tail may be involved in various cellular functions, such as transcription signaling, through interaction with a multitude of proteins. Homo- and heterodimerization of APP and APLPs, which are enhanced by heparan sulfate binding, may play a role in signal transduction and cell adhesion.

The E1 domain functions as a rigid functional entity. Two E1 entities dimerize upon their interaction with heparin, requiring 8-12 sugar rings to form the heparin-bridged E1 dimer. The two subdomains, GFLD and CuBD, interact tightly in a pH-dependent manner via an evolutionarily conserved interface area (see <PDB:3KTM>). The highly conserved, well-defined interdomain linker does not adopt any standard secondary structure but connects both subdomains like a zipper and contributes to the mostly hydrophobic interdomain interface area [1,2]. The slightly larger GFLD subdomain consists of a central antiparallel β-sheet, one α-helix, and a short two-stranded β-sheet, cross-connected by three disulfide bridges (see <PDB:1MWP>) [3]. The 65-residue CuBD subdomain is defined by conserved histidine residues and consists of a central three-stranded antiparallel β-sheet and a long α-helix, catenated by three additional disulfide bridges (see <PDB:2FK2>) [4,5,6].

The E2 domain forms an antiparallel dimer. E2 dimerization is a dynamic and reversible process and heparin binding to E2 shifts the association-dissociation equilibrium in favor of dimer. The structure of E2 consists of two coiled-coil substructures connected through a continuous helix and bears an unexpected resemblance to the spectrin family of protein structure (see <PDB:3NYL>). The E2 contains a high affinity heparin binding site [7,8,9].

We have derived two patterns specific to these proteins, the first one is a perfectly conserved octapeptide located in the CuBD domain; the second is a conserved octapeptide located at the C-terminal end of the cytoplasmic domain. We also developed two profiles covering respectively the entire E1 and E2 domains.

Last update:

July 2018 / Pattern and text revised; profiles added.

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Technical section

PROSITE methods (with tools and information) covered by this documentation:

APP_E1, PS51869; Amyloid precursor protein (APP) E1 domain profile  (MATRIX)

APP_E2, PS51870; Amyloid precursor protein (APP) E2 domain profile  (MATRIX)

APP_CUBD, PS00319; Amyloid precursor protein (APP) copper-binding (CuBD) domain signature  (PATTERN)

APP_INTRA, PS00320; Amyloid precursor protein (APP) intracellular domain signature  (PATTERN)


References

1AuthorsDahms S.O. Hoefgen S. Roeser D. Schlott B. Guehrs K.-H. Than M.E.
TitleStructure and biochemical analysis of the heparin-induced E1 dimer of the amyloid precursor protein.
SourceProc. Natl. Acad. Sci. U. S. A. 107:5381-5386(2010).
PubMed ID20212142
DOI10.1073/pnas.0911326107

2AuthorsHoefgen S. Dahms S.O. Oertwig K. Than M.E.
TitleThe amyloid precursor protein shows a pH-dependent conformational switch in its E1 domain.
SourceJ. Mol. Biol. 427:433-442(2015).
PubMed ID25528641
DOI10.1016/j.jmb.2014.12.005

3AuthorsRossjohn J. Cappai R. Feil S.C. Henry A. McKinstry W.J. Galatis D. Hesse L. Multhaup G. Beyreuther K. Masters C.L. Parker M.W.
TitleCrystal structure of the N-terminal, growth factor-like domain of Alzheimer amyloid precursor protein.
SourceNat. Struct. Biol. 6:327-331(1999).
PubMed ID10201399
DOI10.1038/7562

4AuthorsKong G.K.-W. Adams J.J. Harris H.H. Boas J.F. Curtain C.C. Galatis D. Masters C.L. Barnham K.J. McKinstry W.J. Cappai R. Parker M.W.
TitleStructural studies of the Alzheimer's amyloid precursor protein copper-binding domain reveal how it binds copper ions.
SourceJ. Mol. Biol. 367:148-161(2007).
PubMed ID17239395
DOI10.1016/j.jmb.2006.12.041

5AuthorsBarnham K.J. McKinstry W.J. Multhaup G. Galatis D. Morton C.J. Curtain C.C. Williamson N.A. White A.R. Hinds M.G. Norton R.S. Beyreuther K. Masters C.L. Parker M.W. Cappai R.
TitleStructure of the Alzheimer's disease amyloid precursor protein copper binding domain. A regulator of neuronal copper homeostasis.
SourceJ. Biol. Chem. 278:17401-17407(2003).
PubMed ID12611883
DOI10.1074/jbc.M300629200

6AuthorsLeong S.L. Young T.R. Barnham K.J. Wedd A.G. Hinds M.G. Xiao Z. Cappai R.
TitleQuantification of copper binding to amyloid precursor protein domain 2 and its Caenorhabditis elegans ortholog. Implications for biological function.
SourceMetallomics 6:105-116(2014).
PubMed ID24276282
DOI10.1039/c3mt00258f

7AuthorsWang Y. Ha Y.
TitleThe X-ray structure of an antiparallel dimer of the human amyloid precursor protein E2 domain.
SourceMol. Cell 15:343-353(2004).
PubMed ID15304215
DOI10.1016/j.molcel.2004.06.037

8AuthorsLee S. Xue Y. Hu J. Wang Y. Liu X. Demeler B. Ha Y.
TitleThe E2 domains of APP and APLP1 share a conserved mode of dimerization.
SourceBiochemistry 50:5453-5464(2011).
PubMed ID21574595
DOI10.1021/bi101846x

9AuthorsXue Y. Lee S. Ha Y.
TitleCrystal structure of amyloid precursor-like protein 1 and heparin complex suggests a dual role of heparin in E2 dimerization.
SourceProc. Natl. Acad. Sci. U. S. A. 108:16229-16234(2011).
PubMed ID21930949
DOI10.1073/pnas.1103407108



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