1QTJ

CRYSTAL STRUCTURE OF LIMULUS POLYPHEMUS SAP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.401 
  • R-Value Work: 0.397 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

C-reactive protein and SAP-like pentraxin are both present in Limulus polyphemus haemolymph: crystal structure of Limulus SAP.

Shrive, A.K.Metcalfe, A.M.Cartwright, J.R.Greenhough, T.J.

(1999) J.Mol.Biol. 290: 997-1008

  • DOI: 10.1006/jmbi.1999.2956
  • Also Cited By: 3FLT, 3FLR, 3FLP

  • PubMed Abstract: 
  • C-reactive protein and serum amyloid P component are members of the pentraxin family of oligomeric serum proteins which has been conserved through evolution. In humans both have pentameric structures and both play complex roles in the immune response ...

    C-reactive protein and serum amyloid P component are members of the pentraxin family of oligomeric serum proteins which has been conserved through evolution. In humans both have pentameric structures and both play complex roles in the immune response, C-reactive protein being the classical acute-phase reactant produced in response to tissue damage and inflammation. An invertebrate SAP-like pentraxin has not previously been identified and it has been postulated that C-reactive protein and serum amyloid P component are products of a gene duplication event within vertebrate evolution. We have isolated serum amyloid P component from the haemolymph of the phylogenetically ancient "living fossil", the horseshoe crab Limulus polyphemus and determined the three-dimensional structure by X-ray crystallography. The structure of the previously undiscovered Limulus serum amyloid P component, the first invertebrate lectin structure to be determined, reveals the pentraxin fold and a novel doubly stacked octameric ring. The crystal structure and the discovery that both prototypic pentraxins are present in Limulus raises the possibility that both were present in the common ancestors of arthropods and chordates over 500 million years ago. The impact of the results on our understanding of the origins and evolution of pentraxins and innate immunity is discussed.


    Related Citations: 
    • Preliminary Crystallographic Analysis of C-reactive Protein from Limulus Polyphemus
      Myles, D.A.A.,Bailey, S.,Rule, S.A.,Jones, G.R.,Greenhough, T.J.
      (1990) J.Mol.Biol. 213: 223
    • A Cytolytic Function for a Sialic Acid-Binding Lectin That is a Member of the Pentraxin Family of Proteins
      Armstrong, P.B.,Swarnakar, S.,Srimal, S.,Misquith, S.,Hahn, E.A.,Aimes, R.T.,Quigley, J.P.
      (1996) J.Biol.Chem. 271: 14717
    • Three Dimensional Structure of Human C-reactive Protein
      Shrive, A.K.,Cheetham, G.M.T.,Holden, D.,Myles, D.A.A.,Turnell, W.G.,Volanakis, J.E.,Pepys, M.B.,Bloomer, A.C.,Greenhough, T.J.
      (1996) Nat.Struct.Mol.Biol. 3: 346


    Organizational Affiliation

    Structural Biology Research Group, School of Life Sciences, Keele University, Keele, Staffordshire, ST5 5BG, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (SERUM AMYLOID P COMPONENT)
A, B
217N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
UNK
Query on UNK
A, B
L-PEPTIDE LINKINGC4 H9 N O2

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.401 
  • R-Value Work: 0.397 
  • Space Group: I 4 2 2
Unit Cell:
Length (Å)Angle (°)
a = 173.330α = 90.00
b = 173.330β = 90.00
c = 98.810γ = 90.00
Software Package:
Software NamePurpose
ROTAVATAdata scaling
TFFCmodel building
MOSFLMdata reduction
X-PLORmodel building
X-PLORrefinement
TFFCphasing
X-PLORphasing
CCP4data scaling
Omodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-06-28
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-04
    Type: Refinement description