1MOM

CRYSTAL STRUCTURE OF MOMORDIN, A TYPE I RIBOSOME INACTIVATING PROTEIN FROM THE SEEDS OF MOMORDICA CHARANTIA

• PDB DOI: https://doi.org/10.2210/pdb1MOM/pdb

• Classification: PROTEIN SYNTHESIS INHIBITOR(TOXIN)
• Organism(s): Momordica charantia
• Mutation(s): No 


• Deposited: 1994-03-04 Released: 1994-05-31 
• Deposition Author(s): Husain, J., Tickle, I.J., Wood, S.P.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.16 Å
• R-Value Observed: 0.186 

Literature

Crystal structure of momordin, a type I ribosome inactivating protein from the seeds of Momordica charantia.

Husain, J., Tickle, I.J., Wood, S.P.

(1994) FEBS Lett 342: 154-158

• PubMed: 8143869 
• DOI: https://doi.org/10.1016/0014-5793(94)80491-5
• Primary Citation of Related Structures:  
  1MOM


• PubMed Abstract: 
  

  A type I ribosome-inactivating protein, extracted and purified from M. charantia seeds, was crystallised by vapour diffusion with polyethylene glycol at pH 7.2. X-ray data were collected to 2.1 A resolution and the structure solved by molecular replacement using the A-chain coordinates of ricin. The overall fold of the protein is similar to ricin but there are differences in secondary structure, on the surface and in the active site cleft. These differences are probably due in part to the evolution of the protein without a B-chain partner. The most extensive reorganisation occurs at the C-terminus whereas Tyr70 shows the greatest change in the active site cleft.

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Organizational Affiliation: 

Department of Crystallography, Birkbeck College, London, UK.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 27.83 kDa 
• Atom Count: 2,158 
• Modelled Residue Count: 246 
• Deposited Residue Count: 246 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MOMORDIN	A	246	Momordica charantia	Mutation(s): 0  EC: 3.2.2.22
UniProt
Find proteins for P16094 (Momordica charantia) Explore P16094  Go to UniProtKB:  P16094

Oligosaccharides

Help

Entity ID: 2
Molecule	Chains	Length	2D Diagram	Glycosylation	3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	B	2		N-Glycosylation
Glycosylation Resources
GlyTouCan:  G42666HT GlyCosmos:  G42666HT GlyGen:  G42666HT

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.16 Å
• R-Value Observed: 0.186 
• Space Group: H 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 131.17	α = 90
b = 131.17	β = 90
c = 40.75	γ = 120

Software Package:

Software Name	Purpose
X-PLOR	model building
PROLSQ	refinement
RESTRAIN	refinement
X-PLOR	refinement
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1994-05-31 
Deposition Author(s): Husain, J., Tickle, I.J., Wood, S.P.

Revision History  

• Version 1.0: 1994-05-31
  Type: Initial release
  
• Version 1.1: 2008-03-03
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Non-polymer description, Version format compliance
• Version 1.3: 2017-11-29
  Changes: Derived calculations, Other
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Atomic model, Data collection, Database references, Derived calculations, Structure summary