Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 15.88 kDa 
• Atom Count: 1,213 
• Modelled Residue Count: 137 
• Deposited Residue Count: 137 
• Unique protein chains: 1

 1CBS

CRYSTAL STRUCTURE OF CELLULAR RETINOIC-ACID-BINDING PROTEINS I AND II IN COMPLEX WITH ALL-TRANS-RETINOIC ACID AND A SYNTHETIC RETINOID

• PDB DOI:  https://doi.org/10.2210/pdb1CBS/pdb

• Classification: RETINOIC-ACID TRANSPORT
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 1994-09-28 Released: 1995-01-26 
• Deposition Author(s): Kleywegt, G.J., Bergfors, T., Jones, T.A.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.237 
• R-Value Work: 0.200 
• R-Value Observed: 0.200 

Literature

Crystal structures of cellular retinoic acid binding proteins I and II in complex with all-trans-retinoic acid and a synthetic retinoid.

Kleywegt, G.J., Bergfors, T., Senn, H., Le Motte, P., Gsell, B., Shudo, K., Jones, T.A.

(1994) Structure 2: 1241-1258

• PubMed: 7704533 
• DOI: https://doi.org/10.1016/s0969-2126(94)00125-1
• Primary Citation of Related Structures:  
  1CBQ, 1CBR, 1CBS


• PubMed Abstract: 
  

Retinoic acid (RA) plays a fundamental role in diverse cellular activities. Cellular RA binding proteins (CRABPs) are thought to act by modulating the amount of RA available to nuclear RA receptors. CRABPs and cellular retinol-binding proteins (CRBPs) share a unique fold of two orthogonal beta-sheets that encapsulate their ligands. It has been suggested that a trio of residues are the prime determinants defining the high specificity of CRBPs and CRABPs for their physiological ligands.

---

Related Citations: 

• Lipid-Binding Proteins: A Family of Fatty Acid and Retinoid Transport Proteins
  Banaszak, L., Winter, N., Xu, Z., Bernlohr, D.A., Cowan, S.W., Jones, T.A.
  (1994) Adv Protein Chem 45: 89

• Crystallisation and Preliminary X-Ray Analysis of Recombinant Bovine Cellular Retinoic Acid-Binding Protein
  Bergfors, T., Kleywegt, G.J., Jones, T.A.
  (1994) Acta Crystallogr D Biol Crystallogr 50: 370

• Crystallographic Studies on a Family of Lipophilic Transport Proteins. Refinement of P2 Myelin Protein and the Structure Determination and Refinement of Cellular Retinol-Binding Protein in Complex with All-Trans-Retinol
  Cowan, S.W., Newcomer, M.E., Jones, T.A.
  (1993) J Mol Biol 230: 1225

• The Three-Dimensional Structure of P2 Myelin Protein
  Jones, T.A., Bergfors, T., Sedzik, J., Unge, T.
  (1988) EMBO J 7: 1597

---

Organizational Affiliation: 

Department of Molecular Biology, Uppsala University, Sweden.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CELLULAR RETINOIC ACID BINDING PROTEIN TYPE II	A	137	Homo sapiens	Mutation(s): 0  Gene Names: HUMAN CRABP-II, CRABP2
UniProt & NIH Common Fund Data Resources
Find proteins for P29373 (Homo sapiens) Explore P29373  Go to UniProtKB:  P29373
PHAROS:  P29373

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
REA	B [auth A]	RETINOIC ACID C20 H28 O2 SHGAZHPCJJPHSC-YCNIQYBTSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
REA	BindingDB:  1CBS	Kd: 200 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.237 
• R-Value Work: 0.200 
• R-Value Observed: 0.200 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 45.65	α = 90
b = 47.56	β = 90
c = 77.61	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1995-01-26 
Deposition Author(s): Kleywegt, G.J., Bergfors, T., Jones, T.A.

Revision History  

• Version 1.0: 1995-01-26
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance