1TF0

Crystal structure of the GA module complexed with human serum albumin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.249 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal structure and biological implications of a bacterial albumin binding module in complex with human serum albumin

Lejon, S.Frick, I.-M.Bjorck, L.Wikstrom, M.Svensson, S.

(2004) J.Biol.Chem. 279: 42924-42928

  • DOI: 10.1074/jbc.M406957200
  • Also Cited By: 2J5Y

  • PubMed Abstract: 
  • Many bactericide species express surface proteins that interact with human serum albumin (HSA). Protein PAB from the anaerobic bacterium Finegoldia magna (formerly Peptostreptococcus magnus) represents one of these proteins. Protein PAB contains a do ...

    Many bactericide species express surface proteins that interact with human serum albumin (HSA). Protein PAB from the anaerobic bacterium Finegoldia magna (formerly Peptostreptococcus magnus) represents one of these proteins. Protein PAB contains a domain of 53 amino acid residues known as the GA module. GA homologs are also found in protein G of group C and G streptococci. Here we report the crystal structure of HSA in complex with the GA module of protein PAB. The model of the complex was refined to a resolution of 2.7 A and reveals a novel binding epitope located in domain II of the albumin molecule. The GA module is composed of a left-handed three-helix bundle, and residues from the second helix and the loops surrounding it were found to be involved in HSA binding. Furthermore, the presence of HSA-bound fatty acids seems to influence HSA-GA complex formation. F. magna has a much more restricted host specificity compared with C and G streptococci, which is also reflected in the binding of different animal albumins by proteins PAB and G. The structure of the HSA-GA complex offers a molecular explanation to this unusually clear example of bacterial adaptation.


    Organizational Affiliation

    Department of Cell and Molecular Biology, Uppsala University, SE-751 24 Uppsala, Sweden. sara@xray.bmc.uu.se




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serum albumin
A
572Homo sapiensGene Names: ALB
Find proteins for P02768 (Homo sapiens)
Go to Gene View: ALB
Go to UniProtKB:  P02768
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Peptostreptococcal albumin-binding protein
B
53Finegoldia magnaGene Names: pab
Find proteins for Q51911 (Finegoldia magna)
Go to UniProtKB:  Q51911
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CIT
Query on CIT

Download SDF File 
Download CCD File 
A
CITRIC ACID
C6 H8 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-N
 Ligand Interaction
DKA
Query on DKA

Download SDF File 
Download CCD File 
A
DECANOIC ACID
C10 H20 O2
GHVNFZFCNZKVNT-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.249 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 96.295α = 90.00
b = 134.799β = 90.00
c = 122.463γ = 90.00
Software Package:
Software NamePurpose
ProDCdata collection
SCALEPACKdata scaling
REFMACrefinement
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-09-07
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Source and taxonomy, Version format compliance
  • Version 1.3: 2017-10-11
    Type: Refinement description