Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 4-mer - A2B2 Pseudo Symmetry: Dihedral - D2  (3D View)
Pseudo Stoichiometry: Homo 4-mer -A4 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 64611.18 
• Atom Count: 4558 
• Residue Count: 574 
• Unique protein chains: 2

1A0U

HEMOGLOBIN (VAL BETA1 MET) MUTANT

• DOI: 10.2210/pdb1A0U/pdb

• Classification: OXYGEN TRANSPORT
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 1997-12-08 Released: 1998-03-18 
• Deposition Author(s): Kavanaugh, J.S., Arnone, A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.14 Å
• R-Value Free: 0.239 
• R-Value Work: 0.172 

Literature

High-resolution crystal structures of human hemoglobin with mutations at tryptophan 37beta: structural basis for a high-affinity T-state,.

Kavanaugh, J.S., Weydert, J.A., Rogers, P.H., Arnone, A.

(1998) Biochemistry 37: 4358-4373

• PubMed: 9521756 
• DOI: 10.1021/bi9708702
• Primary Citation of Related Structures:  
  1A0Z, 1A0Y, 1A0X, 1A0W, 1A0V, 1A01, 1A00


• PubMed Abstract: 
  

The high-resolution X-ray structures of the deoxy forms of four recombinant hemoglobins in which Trp37(C3)beta is replaced with Tyr (betaW37Y), Ala (betaW37A), Glu (betaW37E), or Gly (betaW37G) have been refined and analyzed with superposition methods that partition mutation-induced perturbations into quaternary structure changes and tertiary structure changes. In addition, a new cross-validation statistic that is sensitive to local changes in structure (a "local Rfree" parameter) was used as an objective measure of the significance of the tertiary structure changes. No significant mutation-induced changes in tertiary structure are detected at the mutation site itself for any of the four mutants studied. Instead, disruption of the intersubunit contacts associated with Trp37(C3)beta results in (1) a change in quaternary structure at the alpha1beta2 interface, (2) alpha subunit tertiary structure changes that are centered at Asp94(G1)alpha-Pro95(G2)alpha, (3) beta subunit tertiary structure changes that are located between residues Asp99(G1)beta and Asn102(G4)beta, (4) increased mobility of the alpha subunit COOH-terminal dipeptide, and (5) shortening of the Fe-Nepsilon2His(F8) bond in the alpha and beta subunits of the betaW37G and betaW37E mutants. In each case, the magnitude of the change in a particular structural parameter increases in the order betaW37Y < betaW37A < betaW37E approximately betaW37G, which corresponds closely to the degree of functional disruption documented in the preceding papers.

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Related Citations: 

• High-Resolution X-Ray Study of Deoxyhemoglobin Rothschild 37 Beta Trp-->Arg: A Mutation that Creates an Intersubunit Chloride-Binding Site
  Kavanaugh, J.S.,Rogers, P.H.,Case, D.A.,Arnone, A.
  (1992) Biochemistry 31: 4111




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Organizational Affiliation: 

Department of Biochemistry, College of Medicine, The University of Iowa, Iowa City, Iowa 52242, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
HEMOGLOBIN (ALPHA CHAIN)	A, C	141	Homo sapiens	Mutation(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
Molecule	Chains	Sequence Length	Organism	Details
HEMOGLOBIN (BETA CHAIN)	B, D	146	Homo sapiens	Mutation(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
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
HEM	A, B, C, D	PROTOPORPHYRIN IX CONTAINING FE HEME C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.14 Å
• R-Value Free: 0.239 
• R-Value Work: 0.172 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length (Å)	Angle (°)
a = 97.200	α = 90.00
b = 99.300	β = 90.00
c = 65.900	γ = 90.00

Software Package:

Software Name	Purpose
SDMS	data reduction
SDMS	data scaling
PROLSQ	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1997-12-08 
• Released Date: 1998-03-18 
• Deposition Author(s): Kavanaugh, J.S., Arnone, A.

Revision History 

• Version 1.0: 1998-03-18
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance