2QAG

Crystal structure of human septin trimer 2/6/7


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.00 Å
  • R-Value Free: 0.392 
  • R-Value Work: 0.376 
  • R-Value Observed: 0.376 

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Literature

Structural insight into filament formation by mammalian septins.

Sirajuddin, M.Farkasovsky, M.Hauer, F.Kuhlmann, D.Macara, I.G.Weyand, M.Stark, H.Wittinghofer, A.

(2007) Nature 449: 311-315

  • DOI: 10.1038/nature06052
  • Primary Citation of Related Structures:  
    2QA5, 2QAG

  • PubMed Abstract: 
  • Septins are GTP-binding proteins that assemble into homo- and hetero-oligomers and filaments. Although they have key roles in various cellular processes, little is known concerning the structure of septin subunits or the organization and polarity of septin complexes ...

    Septins are GTP-binding proteins that assemble into homo- and hetero-oligomers and filaments. Although they have key roles in various cellular processes, little is known concerning the structure of septin subunits or the organization and polarity of septin complexes. Here we present the structures of the human SEPT2 G domain and the heterotrimeric human SEPT2-SEPT6-SEPT7 complex. The structures reveal a universal bipolar polymer building block, composed of an extended G domain, which forms oligomers and filaments by conserved interactions between adjacent nucleotide-binding sites and/or the amino- and carboxy-terminal extensions. Unexpectedly, X-ray crystallography and electron microscopy showed that the predicted coiled coils are not involved in or required for complex and/or filament formation. The asymmetrical heterotrimers associate head-to-head to form a hexameric unit that is nonpolarized along the filament axis but is rotationally asymmetrical. The architecture of septin filaments differs fundamentally from that of other cytoskeletal structures.


    Organizational Affiliation

    Abteilung Strukturelle Biologie, Max-Planck-Institut für molekulare Physiologie, Otto-Hahn-Strasse 11, 44227 Dortmund, Germany.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Septin-2A361Homo sapiensMutation(s): 0 
Gene Names: SEPT2DIFF6KIAA0158NEDD5SEPTIN2
UniProt & NIH Common Fund Data Resources
Find proteins for Q15019 (Homo sapiens)
Explore Q15019 
Go to UniProtKB:  Q15019
PHAROS:  Q15019
Entity Groups  
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UniProt GroupQ15019
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Septin-6B427Homo sapiensMutation(s): 0 
Gene Names: SEPT6KIAA0128SEP2SEPTIN6
UniProt & NIH Common Fund Data Resources
Find proteins for Q14141 (Homo sapiens)
Explore Q14141 
Go to UniProtKB:  Q14141
PHAROS:  Q14141
Entity Groups  
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UniProt GroupQ14141
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Septin-7C418Homo sapiensMutation(s): 0 
Gene Names: SEPT7CDC10SEPTIN7
UniProt & NIH Common Fund Data Resources
Find proteins for Q16181 (Homo sapiens)
Explore Q16181 
Go to UniProtKB:  Q16181
PHAROS:  Q16181
Entity Groups  
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UniProt GroupQ16181
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GTP
Query on GTP

Download Ideal Coordinates CCD File 
E [auth B]GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N
 Ligand Interaction
GDP
Query on GDP

Download Ideal Coordinates CCD File 
D [auth A],
F [auth C]
GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.00 Å
  • R-Value Free: 0.392 
  • R-Value Work: 0.376 
  • R-Value Observed: 0.376 
  • Space Group: P 43 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 252.515α = 90
b = 252.515β = 90
c = 156.485γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
SOLVEphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-08-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance