1W0B

Solution structure of the human alpha-hemoglobin stabilizing protein (AHSP) P30A mutant


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 40 
  • Conformers Submitted: 20 
  • Selection Criteria: NO DISTANCE VIOLATIONS WERE GREATER THAN 0.3 A NO ANGLE VIOLATIONS WERE GREATER THAN 5.0 DEGREES, AND NO RDC VIOLATIONS WERE GREATER THAN 2.5 HZ 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

NMR structure of the alpha-hemoglobin stabilizing protein: insights into conformational heterogeneity and binding.

Santiveri, C.M.Perez-Canadillas, J.M.Vadivelu, M.K.Allen, M.D.Rutherford, T.J.Watkins, N.A.Bycroft, M.

(2004) J. Biol. Chem. 279: 34963-34970

  • DOI: 10.1074/jbc.M405016200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The structure of alpha-hemoglobin stabilizing protein (AHSP), a molecular chaperone for free alpha-hemoglobin, has been determined using NMR spectroscopy. The protein native state shows conformational heterogeneity attributable to the isomerization o ...

    The structure of alpha-hemoglobin stabilizing protein (AHSP), a molecular chaperone for free alpha-hemoglobin, has been determined using NMR spectroscopy. The protein native state shows conformational heterogeneity attributable to the isomerization of the peptide bond preceding a conserved proline residue. The two equally populated cis and trans forms both adopt an elongated antiparallel three alpha-helix bundle fold but display major differences in the loop between the first two helices and at the C terminus of helix 3. Proline to alanine single point mutation of the residue Pro-30 prevents the cis/trans isomerization. The structure of the P30A mutant is similar to the structure of the trans form of AHSP in the loop 1 region. Both the wild-type AHSP and the P30A mutant bind to alpha-hemoglobin, and the wild-type conformational heterogeneity is quenched upon complex formation, suggesting that just one conformation is the active form. Changes in chemical shift observed upon complex formation identify a binding interface comprising the C terminus of helix 1, the loop 1, and the N terminus of helix 2, with the exposed residues Phe-47 and Tyr-51 being attractive targets for molecular recognition. The characteristics of this interface suggest that AHSP binds at the intradimer alpha1beta1 interface in tetrameric HbA.


    Organizational Affiliation

    Medical Research Council Centre for Protein Engineering, Hills Road, Cambridge CB2 2QH, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ALPHA-HEMOGLOBIN STABILIZING PROTEIN
A
102Homo sapiensMutation(s): 1 
Gene Names: AHSP (EDRF, ERAF)
Find proteins for Q9NZD4 (Homo sapiens)
Go to Gene View: AHSP
Go to UniProtKB:  Q9NZD4
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 40 
  • Conformers Submitted: 20 
  • Selection Criteria: NO DISTANCE VIOLATIONS WERE GREATER THAN 0.3 A NO ANGLE VIOLATIONS WERE GREATER THAN 5.0 DEGREES, AND NO RDC VIOLATIONS WERE GREATER THAN 2.5 HZ 
  • Olderado: 1W0B Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-06-10
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2018-01-24
    Type: Source and taxonomy
  • Version 1.4: 2018-05-02
    Type: Data collection, Database references