Crystal Structure of Yeast Sec14 Homolog Sfh1 in Complex with Phosphatidylethanolamine

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.204 

wwPDB Validation   3D Report Full Report

Ligand Structure Quality Assessment 

This is version 2.0 of the entry. See complete history


Functional anatomy of phospholipid binding and regulation of phosphoinositide homeostasis by proteins of the sec14 superfamily

Schaaf, G.Ortlund, E.A.Tyeryar, K.R.Mousley, C.J.Ile, K.E.Garrett, T.A.Ren, J.Woolls, M.J.Raetz, C.R.Redinbo, M.R.Bankaitis, V.A.

(2008) Mol Cell 29: 191-206

  • DOI: https://doi.org/10.1016/j.molcel.2007.11.026
  • Primary Citation of Related Structures:  
    3B74, 3B7N, 3B7Q, 3B7Z

  • PubMed Abstract: 

    Sec14, the major yeast phosphatidylinositol (PtdIns)/phosphatidylcholine (PtdCho) transfer protein, regulates essential interfaces between lipid metabolism and membrane trafficking from the trans-Golgi network (TGN). How Sec14 does so remains unclear. We report that Sec14 binds PtdIns and PtdCho at distinct (but overlapping) sites, and both PtdIns- and PtdCho-binding activities are essential Sec14 activities. We further show both activities must reside within the same molecule to reconstitute a functional Sec14 and for effective Sec14-mediated regulation of phosphoinositide homeostasis in vivo. This regulation is uncoupled from PtdIns-transfer activity and argues for an interfacial presentation mode for Sec14-mediated potentiation of PtdIns kinases. Such a regulatory role for Sec14 is a primary counter to action of the Kes1 sterol-binding protein that antagonizes PtdIns 4-OH kinase activity in vivo. Collectively, these findings outline functional mechanisms for the Sec14 superfamily and reveal additional layers of complexity for regulating phosphoinositide homeostasis in eukaryotes.

  • Organizational Affiliation

    Department of Cell and Developmental Biology, School of Medicine, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7090, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Uncharacterized protein YKL091C320Saccharomyces cerevisiaeMutation(s): 0 
Find proteins for P33324 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P33324 
Go to UniProtKB:  P33324
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP33324
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on PEE

Download Ideal Coordinates CCD File 
B [auth A]1,2-dioleoyl-sn-glycero-3-phosphoethanolamine
C41 H78 N O8 P
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.204 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.555α = 90
b = 71.297β = 90
c = 99.753γ = 90
Software Package:
Software NamePurpose
SERGUIdata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-02-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2018-02-14
    Changes: Experimental preparation
  • Version 2.0: 2023-08-30
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Non-polymer description, Refinement description, Structure summary