2WND

Structure of an S100A7 triple mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.216 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural and Functional Characterization of a Triple Mutant Form of S100A7 Defective for Jab1 Binding.

West, N.R.Farnell, B.Murray, J.I.Hof, F.Watson, P.H.Boulanger, M.J.

(2009) Protein Sci. 18: 2615

  • DOI: 10.1002/pro.274

  • PubMed Abstract: 
  • S100A7 (psoriasin) is a calcium- and zinc-binding protein implicated in breast cancer. We have shown previously that S100A7 enhances survival mechanisms in breast cells through an interaction with c-jun activation domain binding protein 1 (Jab1), and ...

    S100A7 (psoriasin) is a calcium- and zinc-binding protein implicated in breast cancer. We have shown previously that S100A7 enhances survival mechanisms in breast cells through an interaction with c-jun activation domain binding protein 1 (Jab1), and an engineered S100A7 triple mutant (Asp(56)Gly, Leu(78)Met, and Gln(88)Lys-S100A7(3)) ablates Jab1 binding. We extend these results to include defined breast cancer cell lines and demonstrate a disrupted S100A7(3)/Jab1 phenotype is maintained. To establish the basis for the abrogated Jab1 binding, we have recombinantly produced S100A7(3), demonstrated that it retains the ability to form an exceptionally thermostable dimer, and solved the three dimensional crystal structure to 1.6 A. Despite being positioned at the dimer interface, the Leu(78)Met mutation is easily accommodated and contributes to a methionine-rich pocket formed by Met(12), Met(15), and Met(34). In addition to altering the surface charge, the Gln(88)Lys mutation results in a nearby rotameric shift in Tyr(85), leading to a substantially reorganized surface cavity and may influence zinc binding. The final mutation of Asp(56) to Gly results in the largest structural perturbation shortening helix IV by one full turn. It is noteworthy that position 56 lies in one of two divergent clusters between S100A7 and the functionally distinct yet highly homologous S100A15. The structure of S100A7(3) provides a unique perspective from which to characterize the S100A7-Jab1 interaction and better understand the distinct functions between S100A7, and it is closely related paralog S100A15.


    Organizational Affiliation

    Department of Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN S100-A7
A
96Homo sapiensMutation(s): 3 
Gene Names: S100A7 (PSOR1, S100A7C)
Find proteins for P31151 (Homo sapiens)
Go to Gene View: S100A7
Go to UniProtKB:  P31151
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.216 
  • Space Group: I 41 2 2
Unit Cell:
Length (Å)Angle (°)
a = 68.930α = 90.00
b = 68.930β = 90.00
c = 92.520γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
iMOSFLMdata reduction
PHASERphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-11-03
    Type: Initial release
  • Version 1.1: 2011-06-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance