Structure of human holo plasma RBP4

Experimental Data Snapshot

  • Resolution: 1.50 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.181 

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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: https://doi.org/10.1016/j.bbalip.2018.01.010
  • Primary Citation of Related Structures:  
    5NTY, 5NU2, 5NU6, 5NU7, 5NU8, 5NU9, 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. 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.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Retinol-binding protein 4182Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P02753 (Homo sapiens)
Explore P02753 
Go to UniProtKB:  P02753
PHAROS:  P02753
GTEx:  ENSG00000138207 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02753
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.50 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.181 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 103.097α = 90
b = 103.097β = 90
c = 73.552γ = 120
Software Package:
Software NamePurpose
iMOSFLMdata reduction
SCALAdata scaling

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
  • Version 1.1: 2024-01-17
    Changes: Data collection, Database references, Refinement description