1LFG

Structure of diferric human lactoferrin

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history. 

Literature

Structure of human diferric lactoferrin refined at 2.2 A resolution.

Haridas, M., Anderson, B.F., Baker, E.N.

(1995) Acta Crystallogr.,Sect.D 51: 629-646

  • DOI: 10.1107/S0907444994013521
  • Also Cited By: 2BJJ

  • PubMed Abstract: 

    • The three-dimensional structure of the diferric form of human lactoferrin has been refined at 2.2 A resolution, using synchrotron data combined with a lower resolution (3.2 A) diffractometer data set. Following restrained least-squares refinement and ...

    The three-dimensional structure of the diferric form of human lactoferrin has been refined at 2.2 A resolution, using synchrotron data combined with a lower resolution (3.2 A) diffractometer data set. Following restrained least-squares refinement and model rebuilding the final model comprises 5330 protein atoms (691 residues), 2Fe(3+) and 2CO(3)(2-) ions, 469 solvent molecules and 98 carbohydrate atoms (eight sugar residues). Root-mean-square deviations from standard geometry are 0.015 A for bond lengths and 0.038 A for angle (1-3) distances, and the final crystallographic R-factor is 0.179 for all 39 113 reflections in the resolution range 8.0-2.2 A. A close structural similarity is seen between the two lobes of the molecule, with differences mainly in loops and turns. The two binding sites are extremely similar, the only apparent differences being a slightly more asymmetric bidentate binding of the carbonate ion to the metal, and a slightly longer Fe-O bond to one of the Tyr ligands, in the N-lobe site relative to the C-lobe site. Distinct differences are seen in the interactions made by two cationic groups, Arg210 and Lys546, behind the iron site, and these may influence the stability of the two metal sites. Analysis of interdomain and interlobe interactions shows that these are few in number which is consistent with the known flexibility of the molecule with respect to domain and lobe movements. Internal water molecules are found in discrete sites and in two large clusters (in the two interdomain clefts) and one tightly bound water molecule is present 3.8 A from the Fe atom in each lobe. The carbohydrate is weakly defined and has been modelled to a limited extent; two sugar residues of the N-lobe glycan and six of the C-lobe glycan. Only one direct protein-carbohydrate contact can be found.

    Related Citations: 
    • Structure of Human Lactoferrin: Crystallographic Structure Analysis and Refinement at 2.8 Angstroms Resolution
      Anderson, B.F.,Baker, H.M.,Norris, G.E.,Rice, D.W.,Baker, E.N.
      (1989) J.Mol.Biol. 209: 711
    • Structure of Human Lactoferrin at 3.2 Angstroms Resolution
      Anderson, B.F.,Baker, H.M.,Dodson, E.J.,Norris, G.E.,Rumball, S.V.,Waters, J.M.,Baker, E.N.
      (1987) Proc.Natl.Acad.Sci.USA 84: 1769
    • Transferrins: Insights Into Structure and Function from Studies on Lactoferrin
      Baker, E.N.,Rumball, S.V.,Anderson, B.F.
      (1987) Trends Biochem.Sci.(Pers. Ed.) 12: 350

    Organizational Affiliation: 

    Department of Chemistry and Biochemistry, Massey University, Palmerston North, New Zealand.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
LACTOFERRIN
A
691Homo sapiensMutation(s): 0 
Gene Names: LTF (GIG12, LF)
EC: 3.4.21.-
Find proteins for P02788 (Homo sapiens)
Go to Gene View: LTF
Go to UniProtKB:  P02788
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FUC
Query on FUC
Download SDF File 
Download CCD File 
A
ALPHA-L-FUCOSE
C6 H12 O5
SHZGCJCMOBCMKK-SXUWKVJYSA-N
 Ligand Interaction
FE
Query on FE
Download SDF File 
Download CCD File 
A
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
 Ligand Interaction
NAG
Query on NAG
Download SDF File 
Download CCD File 
A
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
CO3
Query on CO3
Download SDF File 
Download CCD File 
A
CARBONATE ION
C O3
BVKZGUZCCUSVTD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 156.260α = 90.00
b = 97.400β = 90.00
c = 55.850γ = 90.00
Software Package:
Software NamePurpose
PROFFTrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1994-01-31
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance
  • Version 1.3: 2012-02-01
    Type: Database references, Structure summary
  • Version 1.4: 2017-11-29
    Type: Derived calculations, Other