1PY1

Complex of GGA1-VHS domain and beta-secretase C-terminal phosphopeptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.236 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Biochemical and structural characterization of the interaction of memapsin 2 (beta-secretase) cytosolic domain with the VHS domain of GGA proteins.

He, X.Zhu, G.Koelsch, G.Rodgers, K.Zhang, X.C.Tang, J.

(2003) Biochemistry 42: 12174-12180

  • DOI: 10.1021/bi035199h
  • Primary Citation of Related Structures:  
    1PY1

  • PubMed Abstract: 
  • Memapsin 2 (beta-secretase) is a membrane-associated aspartic protease that initiates the hydrolysis of beta-amyloid precursor protein (APP) leading to the production of amyloid-beta and the onset of Alzheimer's disease (AD). Both memapsin 2 and APP are ...

    Memapsin 2 (beta-secretase) is a membrane-associated aspartic protease that initiates the hydrolysis of beta-amyloid precursor protein (APP) leading to the production of amyloid-beta and the onset of Alzheimer's disease (AD). Both memapsin 2 and APP are transported from the cell surface to endosomes where APP hydrolysis takes place. Thus, the intracellular transport mechanism of memapsin 2 is important for understanding the pathogenesis of AD. We have previously shown that the cytosolic domain of memapsin 2 contains an acid-cluster-dileucine (ACDL) motif that binds the VHS domain of GGA proteins (He et al. (2002) FEBS Lett. 524, 183-187). This mechanism is the presumed recognition step for the vesicular packaging of memapsin 2 for its transport to endosomes. The phosphorylation of a serine residue within the ACDL motif has been reported to regulate the recycling of memapsin 2 from early endosomes back to the cell surface. Here, we report a study on the memapsin 2/VHS domain interaction. Using isothermal titration calorimetry, the dissociation constant, K(d), values are 4.0 x 10(-4), 4.1 x 10(-4), and 3.1 x 10(-4) M for VHS domains from GGA1, GGA2, and GGA3, respectively. With the serine residue replaced by phosphoserine, the K(d) decreased about 10-, 4-, and 14-fold for the same three VHS domains. A crystal structure of the complex between memapsin 2 phosphoserine peptide and GGA1 VHS was solved at 2.6 A resolution. The side chain of the phosphoserine group does not interact with the VHS domain but forms an ionic interaction with the side chain of the C-terminal lysine of the ligand peptide. Energy calculation of the binding of native and phosphorylated peptides to VHS domains suggests that this intrapeptide ionic bond in solution may reduce the change in binding entropy and thus increase binding affinity.


    Organizational Affiliation

    Protein Studies Program, Oklahoma Medical Research Foundation, 825 Northeast 13th Street, Oklahoma City, Oklahoma 73104, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ADP-ribosylation factor binding protein GGA1 ABCD158Homo sapiensMutation(s): 0 
Gene Names: GGA1
Find proteins for Q9UJY5 (Homo sapiens)
Explore Q9UJY5 
Go to UniProtKB:  Q9UJY5
NIH Common Fund Data Resources
PHAROS:  Q9UJY5
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-secretase EFGH8N/AMutation(s): 1 
EC: 3.4.23
Find proteins for P56817 (Homo sapiens)
Explore P56817 
Go to UniProtKB:  P56817
NIH Common Fund Data Resources
PHAROS:  P56817
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
E,F,G,HL-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.236 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.14α = 90
b = 95.42β = 90
c = 107.97γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2003-07-07 
  • Released Date: 2003-11-04 
  • Deposition Author(s): Zhu, G., Zhang, X.C.

Revision History 

  • Version 1.0: 2003-11-04
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance