Crystal structure of a putative fructose-1,6-biphosphate aldolase from Coccidioides immitis solved by combined SAD MR

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 

Starting Model: experimental
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SAD phasing using iodide ions in a high-throughput structural genomics environment.

Abendroth, J.Gardberg, A.S.Robinson, J.I.Christensen, J.S.Staker, B.L.Myler, P.J.Stewart, L.J.Edwards, T.E.

(2011) J Struct Funct Genomics 12: 83-95

  • DOI: https://doi.org/10.1007/s10969-011-9101-7
  • Primary Citation of Related Structures:  
    3K9G, 3KM3, 3KW3, 3LUZ, 3MEN, 3NJB, 3O2E, 3OIB, 3P96, 3PFD, 3PM6

  • PubMed Abstract: 

    The Seattle Structural Genomics Center for Infectious Disease (SSGCID) focuses on the structure elucidation of potential drug targets from class A, B, and C infectious disease organisms. Many SSGCID targets are selected because they have homologs in other organisms that are validated drug targets with known structures. Thus, many SSGCID targets are expected to be solved by molecular replacement (MR), and reflective of this, all proteins are expressed in native form. However, many community request targets do not have homologs with known structures and not all internally selected targets readily solve by MR, necessitating experimental phase determination. We have adopted the use of iodide ion soaks and single wavelength anomalous dispersion (SAD) experiments as our primary method for de novo phasing. This method uses existing native crystals and in house data collection, resulting in rapid, low cost structure determination. Iodide ions are non-toxic and soluble at molar concentrations, facilitating binding at numerous hydrophobic or positively charged sites. We have used this technique across a wide range of crystallization conditions with successful structure determination in 16 of 17 cases within the first year of use (94% success rate). Here we present a general overview of this method as well as several examples including SAD phasing of proteins with novel folds and the combined use of SAD and MR for targets with weak MR solutions. These cases highlight the straightforward and powerful method of iodide ion SAD phasing in a high-throughput structural genomics environment.

  • Organizational Affiliation

    Emerald BioStructures, 7869 NE Day Road West, Bainbridge Island, WA 98110, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative fructose-bisphosphate aldolase
A, B
306Coccidioides immitisMutation(s): 0 
Gene Names: CIMG_05755
Find proteins for P0CJ44 (Coccidioides immitis (strain RS))
Explore P0CJ44 
Go to UniProtKB:  P0CJ44
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0CJ44
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on IOD

Download Ideal Coordinates CCD File 
AA [auth B]
BA [auth B]
C [auth A]
CA [auth B]
D [auth A]
AA [auth B],
BA [auth B],
C [auth A],
CA [auth B],
D [auth A],
DA [auth B],
E [auth A],
EA [auth B],
F [auth A],
FA [auth B],
G [auth A],
GA [auth B],
H [auth A],
HA [auth B],
I [auth A],
IA [auth B],
J [auth A],
JA [auth B],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
Q [auth A],
R [auth A],
T [auth B],
U [auth B],
V [auth B],
W [auth B],
X [auth B],
Y [auth B],
Z [auth B]
Query on ZN

Download Ideal Coordinates CCD File 
KA [auth B],
S [auth A]
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.91α = 90
b = 77.77β = 93.71
c = 68.32γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
StructureStudiodata collection
XDSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-12-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description