4ZDW

Crystal structure of the Rab GTPase Sec4p mutant - S29V in complex with Sec2p and GDP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.258 
  • R-Value Observed: 0.260 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

New insights into the molecular mechanism of the Rab GTPase Sec4p activation.

Rinaldi, F.C.Packer, M.Collins, R.

(2015) BMC Struct Biol 15: 14-14

  • DOI: https://doi.org/10.1186/s12900-015-0041-5
  • Primary Citation of Related Structures:  
    4Z8Y, 4ZDW

  • PubMed Abstract: 

    Sec4p is a small monomeric Ras-related GTP-binding protein (23 kDa) that regulates polarized exocytosis in S. cerevisiae. In this study we examine the structural effects of a conserved serine residue in the P-loop corresponding to G12 in Ras. We show that the Sec4p residue serine 29 forms a hydrogen bond with the nucleotide. Mutations of this residue have a different impact than equivalent mutations in Ras and can form stable associations with the exchange factor allowing us to elucidate the structure of a complex of Sec4p bound to the exchange factor Sec2p representing an early stage of the exchange reaction. Our structural investigation of the Sec4p-Sec2p complex reveals the role of the Sec2p coiled-coil domain in facilitating the fast kinetics of the exchange reaction. For Ras-family GTPases, single point mutations that impact the signaling state of the molecule have been well described however less structural information is available for equivalent mutations in the case of Rab proteins. Understanding the structural properties of mutants such as the one described here, provides useful insights into unique aspects of Rab GTPase function.


  • Organizational Affiliation

    Department of Molecular Medicine, Cornell University, Ithaca, NY, 14853, USA. fcr23@cornell.edu.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ras-related protein SEC4170Saccharomyces cerevisiae S288CMutation(s): 1 
Gene Names: SEC4SRO6YFL005W
UniProt
Find proteins for P07560 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P07560 
Go to UniProtKB:  P07560
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP07560
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Rab guanine nucleotide exchange factor SEC2
B, C
93Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SEC2YNL272CN0641
UniProt
Find proteins for P17065 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P17065 
Go to UniProtKB:  P17065
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP17065
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
GDP
Query on GDP

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.258 
  • R-Value Observed: 0.260 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 116.9α = 90
b = 119.28β = 90
c = 122.86γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States5R01GM069596

Revision History  (Full details and data files)

  • Version 1.0: 2015-10-14
    Type: Initial release
  • Version 1.1: 2017-09-20
    Changes: Author supporting evidence, Derived calculations
  • Version 1.2: 2017-11-01
    Changes: Author supporting evidence
  • Version 1.3: 2019-12-25
    Changes: Author supporting evidence
  • Version 1.4: 2023-09-27
    Changes: Data collection, Database references, Refinement description