1VFE

HUMAN LACTOFERRIN, N-TERMINAL LOBE MUTANT WITH ARG 121 REPLACED BY SER (R121S)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Mutation of arginine 121 in lactoferrin destabilizes iron binding by disruption of anion binding: crystal structures of R121S and R121E mutants.

Faber, H.R.Baker, C.J.Day, C.L.Tweedie, J.W.Baker, E.N.

(1996) Biochemistry 35: 14473-14479

  • DOI: 10.1021/bi961729g
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • A conserved arginine residue helps to form the synergistic anion binding site in transferrins. To probe the importance of this residue for anion binding and iron binding, Arg 121 has been mutated to Ser and Glu in N-terminal half-molecule of human la ...

    A conserved arginine residue helps to form the synergistic anion binding site in transferrins. To probe the importance of this residue for anion binding and iron binding, Arg 121 has been mutated to Ser and Glu in N-terminal half-molecule of human lactoferrin. The two mutants, R121S and R121E, have been expressed, purified, and crystallized. Their three-dimensional structures have been determined by X-ray diffraction at 2.3 and 2.5 A resolution, respectively. The structures were determined by molecular replacement and were refined by restrained least squares methods to final R values of 0.185 and 0.204. Both mutants still bind iron but with decreased stability. The crystal structures show that destabilization of iron binding probably results from disruption of the anion binding site; mutation of Arg 121 removes one wall of the anion binding pocket and causes the synergistic carbonate ion to be displaced 0.5 A from its position in the wild-type protein. In the process it becomes partially detached from the helix N-terminus that forms the rest of the anion binding site.


    Related Citations: 
    • Structure of the Recombinant N-Terminal Lobe of Human Lactoferrin at 2.0 A Resolution
      Day, C.L.,Anderson, B.F.,Tweedie, J.W.,Baker, E.N.
      (1993) J.Mol.Biol. 232: 1084


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HUMAN 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: 2.3 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.196 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 97.900α = 90.00
b = 78.800β = 99.20
c = 58.900γ = 90.00
Software Package:
Software NamePurpose
RIGAKUdata collection
Agrovatadata scaling
CCP4phasing
AGROVATA/CCP4data reduction
CCP4model building
TNTrefinement
RIGAKUdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-04-01
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other, Refinement description