Experimental Data Snapshot

  • Resolution: 2.31 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.229 

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Identification, retinoid binding, and x-ray analysis of a human retinol-binding protein.

Folli, C.Calderone, V.Ottonello, S.Bolchi, A.Zanotti, G.Stoppini, M.Berni, R.

(2001) Proc Natl Acad Sci U S A 98: 3710-3715

  • DOI: https://doi.org/10.1073/pnas.061455898
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Two cellular retinol-binding proteins (CRBP I and II) with distinct tissue distributions and retinoid-binding properties have been recognized thus far in mammals. Here, we report the identification of a human retinol-binding protein resembling type I (55.6% identity) and type II (49.6% identity) CRBPs, but with a unique H residue in the retinoid-binding site and a distinctively different tissue distribution. Additionally, this binding protein (CRBP III) exhibits a remarkable sequence identity (62.2%) with the recently identified iota-crystallin/CRBP of the diurnal gecko Lygodactylus picturatus [Werten, P. J. L., Röll, B., van Alten, D. M. F. & de Jong, W. W. (2000) Proc. Natl. Acad. Sci. USA 97, 3282-3287 (First Published March 21, 2000; 10.1073/pnas.050500597)]. CRBP III and all-trans-retinol form a complex (K(d) approximately 60 nM), the absorption spectrum of which is characterized by the peculiar fine structure typical of the spectra of holo-CRBP I and II. As revealed by a 2.3-A x-ray molecular model of apo-CRBP III, the amino acid residues that line the retinol-binding site in CRBP I and II are positioned nearly identically in the structure of CRBP III. At variance with the human CRBP I and II mRNAs, which are most abundant in ovary and intestine, respectively, the CRBP III mRNA is expressed at the highest levels in kidney and liver thus suggesting a prominent role for human CRBP III as an intracellular mediator of retinol metabolism in these tissues.

  • Organizational Affiliation

    Institute of Biochemical Sciences, University of Parma, I-43100 Parma, Italy.

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
134Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P82980 (Homo sapiens)
Explore P82980 
Go to UniProtKB:  P82980
PHAROS:  P82980
GTEx:  ENSG00000139194 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP82980
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.31 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.229 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.514α = 90
b = 59.841β = 90
c = 68.98γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-03-07
    Type: Initial release
  • Version 1.1: 2007-10-16
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-09
    Changes: Data collection, Database references, Refinement description