5DSS

MP-4 contributes to snake venom neutralization by Mucuna pruriens seeds through stimulation of cross-reactive antibodies


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.267 
  • R-Value Observed: 0.268 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

MP-4 Contributes to Snake Venom Neutralization by Mucuna pruriens Seeds through an Indirect Antibody-mediated Mechanism.

Kumar, A.Gupta, C.Nair, D.T.Salunke, D.M.

(2016) J Biol Chem 291: 11373-11384

  • DOI: https://doi.org/10.1074/jbc.M115.699173
  • Primary Citation of Related Structures:  
    5DSS

  • PubMed Abstract: 

    Mortality due to snakebite is a serious public health problem, and available therapeutics are known to induce debilitating side effects. Traditional medicine suggests that seeds of Mucuna pruriens can provide protection against the effects of snakebite. Our aim is to identify the protein(s) that may be important for snake venom neutralization and elucidate its mechanism of action. To this end, we have identified and purified a protein from M. pruriens, which we have named MP-4. The full-length polypeptide sequence of MP-4 was obtained through N-terminal sequencing of peptide fragments. Sequence analysis suggested that the protein may belong to the Kunitz-type protease inhibitor family and therefore may potentially neutralize the proteases present in snake venom. Using various structural and biochemical tools coupled with in vivo assays, we are able to show that MP-4 does not afford direct protection against snake venom because it is actually a poor inhibitor of serine proteases. Further experiments showed that antibodies generated against MP-4 cross-react with the whole venom and provide protection to mice against Echis carinatus snake venom. This study shows that the MP-4 contributes significantly to the snake venom neutralization activity of M. pruriens seeds through an indirect antibody-mediated mechanism.


  • Organizational Affiliation

    From the Structural Biology Unit, National Institute of Immunology, Aruna Asaf Ali Road, New Delhi 110 067, India, the Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, Faridabad 121 001, India, and.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
MP-4A [auth B]185Mucuna pruriensMutation(s): 0 
UniProt
Find proteins for A0A158RFS0 (Mucuna pruriens)
Explore A0A158RFS0 
Go to UniProtKB:  A0A158RFS0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A158RFS0
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.267 
  • R-Value Observed: 0.268 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51α = 90
b = 69.18β = 90
c = 45.32γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata processing
SCALAdata scaling
Cootmodel building
MAR345dtbdata collection

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-03-30
    Type: Initial release
  • Version 1.1: 2016-04-20
    Changes: Derived calculations
  • Version 1.2: 2023-11-08
    Changes: Data collection, Database references, Derived calculations, Refinement description