3TW4 | pdb_00003tw4

Crystal Structure of Human Septin 7 GTPase Domain

• PDB DOI: https://doi.org/10.2210/pdb3TW4/pdb

• Classification: CELL CYCLE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2011-09-21 Released: 2011-11-23 
• Deposition Author(s): Serrao, V.H.B., Alessandro, F., Pereira, H.M., Thiemann, O.T., Garratt, R.C.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.35 Å
• R-Value Free: 
  0.365 (Depositor), 0.370 (DCC) 
• R-Value Work: 
  0.289 (Depositor), 0.293 (DCC) 
• R-Value Observed: 
  0.293 (Depositor) 

Starting Model: experimental

Literature

Promiscuous interactions of human septins: The GTP binding domain of SEPT7 forms filaments within the crystal.

Serrao, V.H., Alessandro, F., Caldas, V.E., Marcal, R.L., D'Muniz Pereira, H., Thiemann, O.H., Garratt, R.C.

(2011) FEBS Lett 585: 3868-3873

• PubMed: 22064074 
• DOI: https://doi.org/10.1016/j.febslet.2011.10.043
• Primary Citation Related Structures: 
  3TW4


• PubMed Abstract: 
  

  We describe the purification, crystallization and structure for the GTP-binding domain of human septin 7 (SEPT7G). We show that it forms filaments within the crystal lattice which employ both the G and NC interfaces, similar to those seen in the hetero-filament of SEPT2/6/7. The NC interface is considered promiscuous as it is absent from the hetero-filament. Such promiscuity could provide the potential for permuting monomers along a filament in order to generate diversity in hetero-polymers. On the other hand, our results suggest that the G and NC interfaces may be necessary but insufficient for determining correct hetero-filament assembly.

---

Organizational Affiliation: 
• Centro de Biotecnologia Molecular Estrutural, Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 63.16 kDa 
• Atom Count: 3,039 
• Modeled Residue Count: 430 
• Deposited Residue Count: 542 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Septin-7	A, B	271	Homo sapiens	Mutation(s): 0  Gene Names: SEPT7, CDC10
UniProt & NIH Common Fund Data Resources
Find proteins for Q16181 (Homo sapiens) Explore Q16181  Go to UniProtKB:  Q16181
PHAROS:  Q16181 GTEx:  ENSG00000122545

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GDP	C [auth A], D [auth B]	GUANOSINE-5'-DIPHOSPHATE C10 H15 N5 O11 P2 QGWNDRXFNXRZMB-UUOKFMHZSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.35 Å
• R-Value Free:  0.365 (Depositor), 0.370 (DCC) 
• R-Value Work:  0.289 (Depositor), 0.293 (DCC) 
• R-Value Observed: 0.293 (Depositor) 

Space Group: P 6₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 82.51	α = 90
b = 82.51	β = 90
c = 210.91	γ = 120

Software Package:

Software Name	Purpose
MOSFLM	data reduction
XSCALE	data scaling
PHASER	phasing
DM	phasing
PHENIX	refinement
PDB_EXTRACT	data extraction
DNA	data collection
XDS	data reduction

Structure Validation

Entry History 

Deposition Data

• Released Date: 2011-11-23 
Deposition Author(s): Serrao, V.H.B., Alessandro, F., Pereira, H.M., Thiemann, O.T., Garratt, R.C.

Revision History  

• Version 1.0: 2011-11-23
  Type: Initial release
  
• Version 1.1: 2011-12-21
  Changes: Database references
• Version 1.2: 2018-01-24
  Changes: Advisory, Structure summary
• Version 1.3: 2023-09-13
  Changes: Advisory, Data collection, Database references, Derived calculations, Refinement description