1AUA | pdb_00001aua

PHOSPHATIDYLINOSITOL TRANSFER PROTEIN SEC14P FROM SACCHAROMYCES CEREVISIAE

• PDB DOI: https://doi.org/10.2210/pdb1AUA/pdb

• Classification: PHOSPHOLIPID-BINDING PROTEIN
• Organism(s): Saccharomyces cerevisiae
• Expression System: Escherichia coli
• Mutation(s): No 
• Membrane Protein: Yes  OPM


• Deposited: 1997-08-20 Released: 1997-12-24 
• Deposition Author(s): Sha, B., Phillips, S.E., Bankaitis, V.A., Luo, M.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 
  0.273 (Depositor), 0.272 (DCC) 
• R-Value Work: 
  0.211 (Depositor), 0.215 (DCC) 
• R-Value Observed: 
  0.211 (Depositor) 

Literature

Crystal structure of the Saccharomyces cerevisiae phosphatidylinositol-transfer protein.

Sha, B., Phillips, S.E., Bankaitis, V.A., Luo, M.

(1998) Nature 391: 506-510

• PubMed: 9461221 
• DOI: https://doi.org/10.1038/35179
• Primary Citation Related Structures: 
  1AUA


• PubMed Abstract: 
  

  The yeast phosphatidylinositol-transfer protein (Sec14) catalyses exchange of phosphatidylinositol and phosphatidylcholine between membrane bilayers in vitro. In vivo, Sec14 activity is essential for vesicle budding from the Golgi complex. Here we report a three-dimensional structure for Sec14 at 2.5 A resolution. Sec14 consists of twelve alpha-helices, six beta-strands, eight 3(10)-helices and has two distinct domains. The carboxy-terminal domain forms a hydrophobic pocket which, in the crystal structure, is occupied by two molecules of n-octyl-beta-D-glucopyranoside and represents the phospholipid-binding domain. This pocket is reinforced by a string motif whose disruption in a sec14 temperature-sensitive mutant results in destabilization of the phospholipid-binding domain. Finally, we have identified an unusual surface helix that may play a critical role in driving Sec14-mediated phospholipid exchange. From this structure, we derive the first molecular clues into how a phosphatidylinositol-transfer protein functions.

---

Organizational Affiliation: 
• Center for Macromolecular Crystallography, Department of Microbiology, University of Alabama at Birmingham, 35294, USA.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 34.63 kDa 
• Atom Count: 2,493 
• Modeled Residue Count: 296 
• Deposited Residue Count: 296 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PHOSPHATIDYLINOSITOL TRANSFER PROTEIN SEC14P	A	296	Saccharomyces cerevisiae	Mutation(s): 0  Gene Names: SEC14 Membrane Entity: Yes
UniProt
Find proteins for P24280 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Explore P24280  Go to UniProtKB:  P24280

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
BOG	B [auth A], C [auth A]	octyl beta-D-glucopyranoside C14 H28 O6 HEGSGKPQLMEBJL-RKQHYHRCSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free:  0.273 (Depositor), 0.272 (DCC) 
• R-Value Work:  0.211 (Depositor), 0.215 (DCC) 
• R-Value Observed: 0.211 (Depositor) 

Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 88.971	α = 90
b = 88.971	β = 90
c = 111.339	γ = 120

Software Package:

Software Name	Purpose
MLPHARE	phasing
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 1997-12-24 
Deposition Author(s): Sha, B., Phillips, S.E., Bankaitis, V.A., Luo, M.

Revision History  

• Version 1.0: 1997-12-24
  Type: Initial release
  
• Version 1.1: 2008-03-03
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Data collection, Derived calculations, Structure summary
• Version 1.4: 2024-02-07
  Changes: Data collection, Database references, Structure summary