The structure of serum amyloid P component bound to 0-phospho- threonine

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.176 
  • R-Value Work: 0.154 
  • R-Value Observed: 0.154 

Starting Model: experimental
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Molecular Dissection of Alzheimer'S Disease Neuropathology by Depletion of Serum Amyloid P Component.

Kolstoe, S.E.Ridha, B.H.Bellotti, V.Wang, N.Robinson, C.V.Crutch, S.J.Keir, G.Kukkastenvehmas, R.Gallimore, J.R.Hutchinson, W.L.Hawkins, P.N.Wood, S.P.Rossor, M.N.Pepys, M.B.

(2009) Proc Natl Acad Sci U S A 106: 7619

  • DOI: https://doi.org/10.1073/pnas.0902640106
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    New therapeutic approaches in Alzheimer's disease are urgently needed. The normal plasma protein, serum amyloid P component (SAP), is always present in cerebrospinal fluid (CSF) and in the pathognomonic lesions of Alzheimer's disease, cerebrovascular and intracerebral Abeta amyloid plaques and neurofibrillary tangles, as a result of its binding to amyloid fibrils and to paired helical filaments, respectively. SAP itself may also be directly neurocytotoxic. Here, in this unique study in Alzheimer's disease of the bis(d-proline) compound, (R)-1-[6-[(R)-2-carboxy-pyrrolidin-1-yl]-6-oxo-hexanoyl]pyrrolidine-2-carboxylic acid (CPHPC), we observed depletion of circulating SAP and also remarkable, almost complete, disappearance of SAP from the CSF. We demonstrate that SAP depletion in vivo is caused by CPHPC cross-linking pairs of SAP molecules in solution to form complexes that are immediately cleared from the plasma. We have also solved the structure of SAP complexed with phosphothreonine, its likely ligand on hyperphosphorylated tau protein. These results support further clinical study of SAP depletion in Alzheimer's disease and potentially other neurodegenerative diseases.

  • Organizational Affiliation

    Centre for Amyloidosis and Acute Phase Proteins and National Amyloidosis Centre, Division of Medicine (Royal Free Campus), University College London Medical School, London NW3 2PF, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D, E
204Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P02743 (Homo sapiens)
Explore P02743 
Go to UniProtKB:  P02743
GTEx:  ENSG00000132703 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02743
Glycosylation Sites: 1Go to GlyGen: P02743-1
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on NAG

Download Ideal Coordinates CCD File 
H [auth A],
L [auth B],
P [auth C],
T [auth D],
X [auth E]
C8 H15 N O6
Query on TPO

Download Ideal Coordinates CCD File 
I [auth A],
M [auth B],
Q [auth C],
U [auth D],
Y [auth E]
C4 H10 N O6 P
Query on CA

Download Ideal Coordinates CCD File 
F [auth A]
G [auth A]
J [auth B]
K [auth B]
N [auth C]
F [auth A],
G [auth A],
J [auth B],
K [auth B],
N [auth C],
O [auth C],
R [auth D],
S [auth D],
V [auth E],
W [auth E]
Binding Affinity Annotations 
IDSourceBinding Affinity
TPO PDBBind:  2W08 Kd: 3.80e+5 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.176 
  • R-Value Work: 0.154 
  • R-Value Observed: 0.154 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 94.769α = 90
b = 69.435β = 97.05
c = 102.063γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-04-14
    Type: Initial release
  • Version 1.1: 2011-05-07
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Data collection, Derived calculations, Other, Structure summary
  • Version 1.4: 2023-12-13
    Changes: Data collection, Database references, Refinement description, Structure summary