5NU9

Structure of human amniotic fluid RBP4 saturated with palmitate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.171 

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This is version 1.0 of the entry. See complete history


Literature

Human plasma retinol-binding protein (RBP4) is also a fatty acid-binding protein.

Perduca, M.Nicolis, S.Mannucci, B.Galliano, M.Monaco, H.L.

(2018) Biochim Biophys Acta 1863: 458-466

  • DOI: 10.1016/j.bbalip.2018.01.010
  • Primary Citation of Related Structures:  
    5NU7, 5NU6, 5NU9, 5NU8, 5NTY, 5NU2, 5NUA, 5NUB

  • PubMed Abstract: 
  • RBP4 (plasma retinol-binding protein) is the 21 kDa transporter of all-trans retinol that circulates in plasma as a moderately tight 1:1 molar complex of the vitamin with the protein. RBP4 is primarily synthesized in the liver but is also produced by adipose tissue and circulates bound to a larger protein, transthyretin, TTR, that serves to increase its molecular mass and thus avoid its elimination by glomerular filtration ...

    RBP4 (plasma retinol-binding protein) is the 21 kDa transporter of all-trans retinol that circulates in plasma as a moderately tight 1:1 molar complex of the vitamin with the protein. RBP4 is primarily synthesized in the liver but is also produced by adipose tissue and circulates bound to a larger protein, transthyretin, TTR, that serves to increase its molecular mass and thus avoid its elimination by glomerular filtration. This paper reports the high resolution three-dimensional structures of human RBP4 naturally lacking bound retinol purified from plasma, urine and amniotic fluid. In all these crystals we found a fatty acid molecule bound in the hydrophobic ligand-binding site, a result confirmed by mass spectrometry measurements. In addition we also report the 1.5 Å resolution structures of human holo-RBP4 and of the protein saturated with palmitic and lauric acid and discuss the interaction of the fatty acids and retinol with the protein.


    Organizational Affiliation

    Biocrystallography Laboratory, Department of Biotechnology, University of Verona, Ca Vignal 1, strada Le Grazie 15, 37134 Verona, Italy. Electronic address: hugo.monaco@univr.it.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Retinol-binding protein 4A182Homo sapiensMutation(s): 0 
Gene Names: RBP4PRO2222
UniProt & NIH Common Fund Data Resources
Find proteins for P02753 (Homo sapiens)
Explore P02753 
Go to UniProtKB:  P02753
PHAROS:  P02753
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PLM (Subject of Investigation/LOI)
Query on PLM

Download Ideal Coordinates CCD File 
B [auth A]PALMITIC ACID
C16 H32 O2
IPCSVZSSVZVIGE-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download Ideal Coordinates CCD File 
C [auth A], D [auth A]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.171 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.84α = 90
b = 102.84β = 90
c = 73.164γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
iMOSFLMdata reduction
SCALAdata scaling
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-03-07
    Type: Initial release