3A58

Crystal structure of Sec3p - Rho1p complex from Saccharomyces cerevisiae

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.235 

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Literature

Structural basis for the Rho- and phosphoinositide-dependent localization of the exocyst subunit Sec3

Yamashita, M., Kurokawa, K., Sato, Y., Yamagata, A., Mimura, H., Yoshikawa, A., Sato, K., Nakano, A., Fukai, S.

(2010) Nat Struct Mol Biol 17: 180-186

  • DOI: 10.1038/nsmb.1722
  • Primary Citation of Related Structures:  
    3A58

  • PubMed Abstract: 

    • The exocyst complex is a hetero-octameric protein complex that functions during cell polarization by tethering the secretory vesicle to the target membrane. The yeast exocyst subunit Sec3 binds to phosphatidylinositol 4,5-bisphosphate (PtdIns(4,5)P(2)) and the small GTPases Rho1 and Cdc42 via its N-terminal domain (Sec3-N), and these interactions target Sec3 to the plasma membrane ...

    The exocyst complex is a hetero-octameric protein complex that functions during cell polarization by tethering the secretory vesicle to the target membrane. The yeast exocyst subunit Sec3 binds to phosphatidylinositol 4,5-bisphosphate (PtdIns(4,5)P(2)) and the small GTPases Rho1 and Cdc42 via its N-terminal domain (Sec3-N), and these interactions target Sec3 to the plasma membrane. Here we report the crystal structure of the Sec3-N in complex with Rho1 at 2.6-A resolution. Sec3-N adopts a pleckstrin homology (PH) fold, despite having no detectable sequence homology with other PH domains of known structure. Clusters of conserved basic residues constitute a positively charged cleft, which was identified as a binding site for PtdIns(4,5)P(2). Residues Phe77, Ile115 and Leu131 of Sec3 bind to an extended hydrophobic surface formed around switch regions I and II of Rho1. To our knowledge, these are the first structural insights into how an exocyst subunit might interact with both protein and phospholipid factors on the target membrane.

    Organizational Affiliation: 

    Structural Biology Laboratory, Life Science Division, Synchrotron Radiation Research Organization and Institute of Molecular and Cellular Biosciences, The University of Tokyo, Tokyo, Japan.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Exocyst complex component SEC3A, C, E320Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: SEC3, PSL1, YER008C
UniProt
Find proteins for P33332 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P33332 
Go to UniProtKB:  P33332
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP33332
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
GTP-binding protein RHO1B, D, F188Saccharomyces cerevisiaeMutation(s): 1 
Gene Names: RHO1, YPR165W, P9325.3
UniProt
Find proteins for P06780 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P06780 
Go to UniProtKB:  P06780
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP06780
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE		A, C, E L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.235 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 116α = 90
b = 116.054β = 90
c = 247.675γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
SHARPphasing
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-01-12
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2013-09-18
    Changes: Derived calculations
  • Version 1.3: 2021-11-10
    Changes: Database references, Derived calculations