Crystal structure of hemopexin fold protein CP4 from cow pea

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.209 

Starting Model: experimental
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The structure of a haemopexin-fold protein from cow pea (Vigna unguiculata) suggests functional diversity of haemopexins in plants

Gaur, V.Chanana, V.Jain, A.Salunke, D.M.

(2011) Acta Crystallogr Sect F Struct Biol Cryst Commun 67: 193-200

  • DOI: https://doi.org/10.1107/S1744309110051250
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The haemopexin fold is present in almost all life forms and is utilized for carrying out diverse physiological functions. The structure of CP4, a haemopexin-fold protein from cow pea (Vigna unguiculata), was determined at 2.1 Å resolution. The protein exists as a monomer both in solution and in the crystal. The structure revealed a typical four-bladed β-propeller topology. The protein exhibits 42% sequence similarity to LS-24 from Lathyrus sativus, with substantial differences in the surface-charge distribution and in the oligomeric state. A structure-based sequence analysis of haemopexin-fold proteins of plant and mammalian origin established a sequence signature associated with the haemopexin motif. This signature sequence enabled the identification of other proteins with possible haemopexin-like topology of both plant and animal origin. Although CP4 shares a structural fold with LS-24 and other haemopexins, biochemical studies indicated possible functional differences between CP4 and LS-24. While both of these proteins exhibit spermine-binding potential, CP4 does not bind to haem, unlike LS-24.

  • Organizational Affiliation

    National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, India.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
hemopexin fold protein CP4
A, B
225Vigna unguiculataMutation(s): 0 
Find proteins for F2Z290 (Vigna unguiculata)
Explore F2Z290 
Go to UniProtKB:  F2Z290
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupF2Z290
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.209 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 125.087α = 90
b = 60.138β = 111.18
c = 67.574γ = 90
Software Package:
Software NamePurpose
MAR345dtbdata collection
AUTOMARdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-02-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2014-03-26
    Changes: Database references
  • Version 1.3: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description