Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 25.65 kDa 
• Atom Count: 1758 
• Modelled Residue Count: 203 
• Deposited Residue Count: 214 
• Unique protein chains: 1

1LN1

Crystal Structure of Human Phosphatidylcholine Transfer Protein in Complex with Dilinoleoylphosphatidylcholine

• PDB DOI: 10.2210/pdb1LN1/pdb

• Classification: LIPID BINDING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2002-05-02 Released: 2002-06-26 
• Deposition Author(s): Roderick, S.L., Chan, W.W., Agate, D.S., Olsen, L.R., Vetting, M.W., Rajashankar, K.R., Cohen, D.E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.296 
• R-Value Work: 0.234 
• R-Value Observed: 0.237 

Literature

Structure of human phosphatidylcholine transfer protein in complex with its ligand.

Roderick, S.L., Chan, W.W., Agate, D.S., Olsen, L.R., Vetting, M.W., Rajashankar, K.R., Cohen, D.E.

(2002) Nat Struct Biol 9: 507-511

• PubMed: 12055623 
• DOI: 10.1038/nsb812
• Primary Citation of Related Structures:  
  1LN1, 1LN2, 1LN3


• PubMed Abstract: 
  

Phosphatidylcholines (PtdChos) comprise the most common phospholipid class in eukaryotic cells. In mammalian cells, these insoluble molecules are transferred between membranes by a highly specific phosphatidylcholine transfer protein (PC-TP) belonging to the steroidogenic acute regulatory protein related transfer (START) domain superfamily of hydrophobic ligand-binding proteins. The crystal structures of human PC-TP in complex with dilinoleoyl-PtdCho or palmitoyl-linoleoyl-PtdCho reveal that a single well-ordered PtdCho molecule occupies a centrally located tunnel. The positively charged choline headgroup of the lipid engages in cation-pi interactions within a cage formed by the faces of three aromatic residues. These binding determinants and those for the phosphoryl group may be exposed to the lipid headgroup at the membrane-water interface by a conformational change involving the amphipathic C-terminal helix and an Omega-loop. The structures presented here provide a basis for rationalizing the specificity of PC-TP for PtdCho and may identify common features used by START proteins to bind their hydrophobic ligands.

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Organizational Affiliation: 

Department of Biochemistry, Marion Bessin Liver Research Center, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, New York 10461, USA. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Phosphatidylcholine transfer protein	A	214	Homo sapiens	Mutation(s): 0  Gene Names: PCTP, STARD2
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UKL6 (Homo sapiens) Explore Q9UKL6  Go to UniProtKB:  Q9UKL6
PHAROS:  Q9UKL6 GTEx:  ENSG00000141179

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
DLP	B [auth A]	1,2-DILINOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE C44 H80 N O8 P FVXDQWZBHIXIEJ-LNDKUQBDSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.296 
• R-Value Work: 0.234 
• R-Value Observed: 0.237 
• Space Group: I 4 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 133.3	α = 90
b = 133.3	β = 90
c = 83	γ = 90

Software Package:

Software Name	Purpose
MAR345	data collection
SCALEPACK	data scaling
X-PLOR	model building
CNS	refinement
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-05-02 
• Released Date: 2002-06-26 
Deposition Author(s): Roderick, S.L., Chan, W.W., Agate, D.S., Olsen, L.R., Vetting, M.W., Rajashankar, K.R., Cohen, D.E.

Revision History  

• Version 1.0: 2002-06-26
  Type: Initial release
  
• Version 1.1: 2008-04-28
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-10-11
  Changes: Refinement description