1DSN

D60S N-TERMINAL LOBE HUMAN LACTOFERRIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Altered domain closure and iron binding in transferrins: the crystal structure of the Asp60Ser mutant of the amino-terminal half-molecule of human lactoferrin.

Faber, H.R.Bland, T.Day, C.L.Norris, G.E.Tweedie, J.W.Baker, E.N.

(1996) J.Mol.Biol. 256: 352-363


  • PubMed Abstract: 
  • The crystal structure of a site-specific mutant of the N-terminal half-molecule of human lactoferrin, Lf(N), in which the iron ligand Asp60 has been mutated to Ser, has been determined at 2.05 A resolution in order to determine the effects of the mut ...

    The crystal structure of a site-specific mutant of the N-terminal half-molecule of human lactoferrin, Lf(N), in which the iron ligand Asp60 has been mutated to Ser, has been determined at 2.05 A resolution in order to determine the effects of the mutation on iron binding and domain closure. Yellow monoclinic crystals of the D60S mutant, in its iron-bound form, were prepared, and have unit cell dimensions a = 110.2 A, b = 57.0 A, c = 55.2 A, beta = 97.6 degrees, space group C2, with one molecule of 333 residues in the asymmetric unit. The structure was determined by molecular replacement, using the wild-type Lf(N) as search model, and was refined by restrained least-squares methods. The final model, comprising 2451 protein atoms (from residues 2 to 315) one Fe3+ and one CO2-(3), and 107 water molecules, gives an R-factor of 0.175 for all data in the resolution range 20.0 to 2.05 A. The model conforms well with standard geometry, having root-mean-square deviations of 0.014 A and 1.2 degrees from standard bond lengths and angles. The structure of the D60S mutant deviates in two important respects from the parent Lf(N) molecule. At the mutation site the Ser side-chain neither binds to the iron atom nor makes any interdomain contact as the substituted Asp does; instead a water molecule fills the iron coordination site and participates in interdomain hydrogen bonding. The domain closure is also changed, with the D60S mutant having a more closed conformation. Consideration of crystal packing suggests that the altered domain closure is a genuine molecular property but both the iron coordination and interdomain contacts are consistent with weakened iron binding in the mutant. The implications for iron binding in transferrins generally are discussed.


    Related Citations: 
    • Studies of the N-Terminal Half of Human Lactoferrin Produced from Cloned Cdna Demonstrate that Interlobe Interactions Modulate Iron Release
      Day, C.L.,Stowell, K.M.,Baker, E.N.,Tweedie, J.W.
      (1992) J.Biol.Chem. 267: 13857
    • Structure of the Recombinant N-Terminal Lobe of Human Lactoferrin at 2.0 Angstroms Resolution
      Day, C.L.,Anderson, B.F.,Tweedie, J.W.,Baker, E.N.
      (1993) J.Mol.Biol. 232: 1084


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
LACTOFERRIN
A
333Homo sapiensMutation(s): 1 
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 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FE
Query on FE

Download SDF File 
Download CCD File 
A
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-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: 2.05 Å
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 110.200α = 90.00
b = 57.000β = 97.60
c = 55.200γ = 90.00
Software Package:
Software NamePurpose
RIGAKUdata collection
TNTrefinement
RIGAKUdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-03-08
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other