1BZ0

HEMOGLOBIN A (HUMAN, DEOXY, HIGH SALT)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.167 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history. 

Literature

Accommodation of insertions in helices: the mutation in hemoglobin Catonsville (Pro 37 alpha-Glu-Thr 38 alpha) generates a 3(10)-->alpha bulge.

Kavanaugh, J.S., Moo-Penn, W.F., Arnone, A.

(1993) Biochemistry 32: 2509-2513


  • PubMed Abstract: 

    • Hemoglobin Catonsville is a mutation of human hemoglobin (an alpha 2 beta 2 tetramer) in which a glutamate residue is inserted into the first turn of a highly conserved 3(10) helix (the C helix) of each alpha subunit. In theory, amino acid insertions ...

    Hemoglobin Catonsville is a mutation of human hemoglobin (an alpha 2 beta 2 tetramer) in which a glutamate residue is inserted into the first turn of a highly conserved 3(10) helix (the C helix) of each alpha subunit. In theory, amino acid insertions (or deletions) in protein helices can be accommodated via two distinct mechanisms. One, termed the register shift mechanism, preserves the geometry of the helix while requiring all of the residues on one flank of the insertion site to rotate by 100 degrees in the case of an alpha helix or by 120 degrees in the case of a 3(10) helix. The other, termed the bulge (or indentation) mechanism, distorts the local geometry of the helix but does not alter the helix register. High-resolution X-ray diffraction analysis of deoxyhemoglobin Catonsville shows that the inserted residue is accommodated as a bulge, demonstrating that this is a viable mechanism. (In contrast, no such evidence is yet available for the register shift mechanism.) More specifically, the insertion converts one turn of the C helix from 3(10) geometry to alpha helix-like geometry, raising the possibility that a common mechanism for accommodating insertions and deletions within helices may involve localized interconversions between 3(10), alpha, and pi helical structures.

    Related Citations: 
    • The Crystal Structure of Human Deoxyhaemoglobin at 1.74 A Resolution
      Fermi, G.,Perutz, M.F.,Shaanan, B.,Fourme, R.
      (1984) J.Mol.Biol. 175: 159

    Organizational Affiliation: 

    Department of Biochemistry, University of Iowa, Iowa City 52242.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (HEMOGLOBIN ALPHA CHAIN)
A, C
141Homo sapiensMutation(s): 0 
Gene Names: HBA1, HBA2
Find proteins for P69905 (Homo sapiens)
Go to Gene View: HBA1 HBA2
Go to UniProtKB:  P69905
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (HEMOGLOBIN BETA CHAIN)
B, D
146Homo sapiensMutation(s): 0 
Gene Names: HBB
Find proteins for P68871 (Homo sapiens)
Go to Gene View: HBB
Go to UniProtKB:  P68871
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM
Download SDF File 
Download CCD File 
A, B, C, D
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.167 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 63.300α = 90.00
b = 83.600β = 99.40
c = 53.800γ = 90.00
Software Package:
Software NamePurpose
SDMSdata scaling
PROLSQrefinement
SDMSdata reduction

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-11-11
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance