2LBA

Solution structure of chicken ileal BABP in complex with glycochenodeoxycholic acid


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 400 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Requirements for Cooperativity in Ileal Bile Acid-binding Proteins.

Zanzoni, S.Assfalg, M.Giorgetti, A.D'Onofrio, M.Molinari, H.

(2011) J.Biol.Chem. 286: 39307-39317

  • DOI: 10.1074/jbc.M111.261099

  • PubMed Abstract: 
  • Ileal bile acid-binding proteins (I-BABP), belonging to the family of intracellular lipid-binding proteins, control bile acid trafficking in enterocytes and participate in regulating the homeostasis of these cholesterol-derived metabolites. I-BABP or ...

    Ileal bile acid-binding proteins (I-BABP), belonging to the family of intracellular lipid-binding proteins, control bile acid trafficking in enterocytes and participate in regulating the homeostasis of these cholesterol-derived metabolites. I-BABP orthologues share the same structural fold and are able to host up to two ligands in their large internal cavities. However variations in the primary sequences determine differences in binding properties such as the degree of binding cooperativity. To investigate the molecular requirements for cooperativity we adopted a gain-of-function approach, exploring the possibility to turn the noncooperative chicken I-BABP (cI-BABP) into a cooperative mutant protein. To this aim we first solved the solution structure of cI-BABP in complex with two molecules of the physiological ligand glycochenodeoxycholate. A comparative structural analysis with closely related members of the same protein family provided the basis to design a double mutant (H99Q/A101S cI-BABP) capable of establishing a cooperative binding mechanism. Molecular dynamics simulation studies of the wild type and mutant complexes and essential dynamics analysis of the trajectories supported the role of the identified amino acid residues as hot spot mediators of communication between binding sites. The emerging picture is consistent with a binding mechanism that can be described as an extended conformational selection model.


    Organizational Affiliation

    Department of Biotechnology, University of Verona, 37134 Verona, Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BABP protein
A
136Gallus gallusGene Names: FABP6
Find proteins for F1NUJ7 (Gallus gallus)
Go to Gene View: FABP6
Go to UniProtKB:  F1NUJ7
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CHO
Query on CHO

Download SDF File 
Download CCD File 
A
GLYCOCHENODEOXYCHOLIC ACID
C26 H43 N O5
GHCZAUBVMUEKKP-GYPHWSFCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 400 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2LBA Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-09-14
    Type: Initial release
  • Version 1.1: 2011-09-28
    Type: Database references
  • Version 1.2: 2011-11-30
    Type: Database references