Structure of Artocarpin Complexed with Me-alpha-Mannose

Experimental Data Snapshot

  • Resolution: 2.90 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.222 

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Crystal structures of artocarpin, a Moraceae lectin with mannose specificity, and its complex with methyl-alpha-D-mannose: implications to the generation of carbohydrate specificity.

Pratap, J.V.Jeyaprakash, A.A.Rani, P.G.Sekar, K.Surolia, A.Vijayan, M.

(2002) J Mol Biol 317: 237-247

  • DOI: https://doi.org/10.1006/jmbi.2001.5432
  • Primary Citation of Related Structures:  
    1J4S, 1J4T, 1J4U

  • PubMed Abstract: 

    The seeds of jack fruit (Artocarpus integrifolia) contain two tetrameric lectins, jacalin and artocarpin. Jacalin was the first lectin found to exhibit the beta-prism I fold, which is characteristic of the Moraceae plant lectin family. Jacalin contains two polypeptide chains produced by a post-translational proteolysis which has been shown to be crucial for generating its specificity for galactose. Artocarpin is a single chain protein with considerable sequence similarity with jacalin. It, however, exhibits many properties different from those of jacalin. In particular, it is specific to mannose. The structures of two crystal forms, form I and form II, of the native lectin have been determined at 2.4 and 2.5 A resolution, respectively. The structure of the lectin complexed with methyl-alpha-mannose, has also been determined at 2.9 A resolution. The structure is similar to jacalin, although differences exist in details. The crystal structures and detailed modelling studies indicate that the following differences between the carbohydrate binding sites of artocarpin and jacalin are responsible for the difference in the specificities of the two lectins. Firstly, artocarpin does not contain, unlike jacalin, an N terminus generated by post-translational proteolysis. Secondly, there is no aromatic residue in the binding site of artocarpin whereas there are four in that of jacalin. A comparison with similar lectins of known structures or sequences, suggests that, in general, stacking interactions with aromatic residues are important for the binding of galactose while such interactions are usually absent in the carbohydrate binding sites of mannose-specific lectins with the beta-prism I fold.

  • Organizational Affiliation

    Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
149Artocarpus integerMutation(s): 1 
Find proteins for Q7M1T4 (Artocarpus integer)
Explore Q7M1T4 
Go to UniProtKB:  Q7M1T4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7M1T4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.90 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.222 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 129.2α = 90
b = 129.2β = 90
c = 78.61γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-03-27
    Type: Initial release
  • Version 1.1: 2008-04-26
    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, Database references, Derived calculations, Structure summary
  • Version 1.4: 2023-12-27
    Changes: Data collection, Database references, Structure summary