1NKX

CRYSTAL STRUCTURE OF A PROTEOLYTICALLY GENERATED FUNCTIONAL MONOFERRIC C-LOBE OF BOVINE LACTOFERRIN AT 1.9A RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.202 

Starting Model: experimental
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This is version 2.2 of the entry. See complete history


Literature

Crystal Structure of a Proteolytically Generated Functional Monoferric C-lobe of Bovine Lactoferrin at 1.9A Resolution

Sharma, S.Jasti, J.Kumar, J.Mohanty, A.K.Singh, T.P.

(2003) J Mol Biol 331: 485-496

  • DOI: https://doi.org/10.1016/s0022-2836(03)00717-4
  • Primary Citation of Related Structures:  
    1NKX

  • PubMed Abstract: 

    This is the first crystal structure of a proteolytically generated functional C-lobe of lactoferrin. The purified samples of iron-saturated C-lobe were crystallized in 0.1 M Mes buffer (pH 6.5) containing 25% (v/v) polyethyleneglycol monomethyl ether 550 M and 0.1 M zinc sulphate heptahydrate. The X-ray intensity data were collected with 300 mm imaging plate scanner mounted on a rotating anode generator. The structure was determined by the molecular replacement method using the coordinates of the C-terminal half of bovine lactoferrin as a search model and refined to an R-factor of 0.193 for all data to 1.9A resolution. The final model comprises 2593 protein atoms (residues 342-676 and 681-685), 124 carbohydrate atoms (from ten monosaccharide units, in three glycan chains), one Fe(3+), one CO(3)(2-), two Zn(2+) and 230 water molecules. The overall folding of the C-lobe is essentially the same as that of C-terminal half of bovine lactoferrin but differs slightly in conformations of some of the loops and reveals a number of new interactions. There are 20 Cys residues in the C-lobe forming ten disulphide links. Out of these, one involving Cys481-Cys675 provides an inter-domain link at 2.01A while another Cys405-Cys684 is formed between the main C-lobe 342-676 and the hydrolyzed pentapeptide 681-685 fragment. Six inter-domain hydrogen bonds have been observed in the structure whereas only four were reported in the structure of intact lactoferrin, although domain orientations have been found similar in the two structures. The good quality of electron density has also revealed all the ten oligosaccharide units in the structure. The observation of two metal ions at sites other than the iron-binding cleft is another novel feature of the present structure. These zinc ions stabilize the crystal packing. This structure is also notable for extensive inter-molecular hydrogen bonding in the crystals. Therefore, the present structure appears to be one of the best packed crystal structures among the proteins of the transferrin superfamily.


  • Organizational Affiliation

    Department of Biophysics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi 110029, India.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
LACTOTRANSFERRIN348Bos taurusMutation(s): 0 
EC: 3.4.21
UniProt
Find proteins for P24627 (Bos taurus)
Explore P24627 
Go to UniProtKB:  P24627
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP24627
Glycosylation
Glycosylation Sites: 3
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
B
3N-Glycosylation
Glycosylation Resources
GlyTouCan:  G15407YE
GlyCosmos:  G15407YE
GlyGen:  G15407YE
Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-4)-alpha-D-mannopyranose-(1-4)-alpha-D-mannopyranose-(1-4)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
C
6N-Glycosylation
Glycosylation Resources
GlyTouCan:  G53778HF
GlyCosmos:  G53778HF
GlyGen:  G53778HF
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.202 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.359α = 90
b = 50.471β = 107.72
c = 65.934γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-09-02
    Type: Initial release
  • Version 1.1: 2007-10-16
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2018-08-22
    Changes: Data collection, Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2023-08-16
    Changes: Data collection, Database references, Refinement description, Structure summary
  • Version 2.2: 2024-10-30
    Changes: Structure summary