Biological Assembly 1  

 3D View: Structure | 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.

Macromolecule Content

• Total Structure Weight: 64643.23 
• Atom Count: 4564 
• Residue Count: 574 
• Unique protein chains: 2

1CMY

THE MUTATION BETA99 ASP-TYR STABILIZES Y-A NEW, COMPOSITE QUATERNARY STATE OF HUMAN HEMOGLOBIN

• DOI: 10.2210/pdb1CMY/pdb

• Classification: OXYGEN TRANSPORT
• Organism(s): Homo sapiens


• Deposited: 1992-09-18 Released: 1993-10-31 
• Deposition Author(s): Smith, F.R., Lattman, E.E., Carter Junior, C.W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3 Å

Literature

The mutation beta 99 Asp-Tyr stabilizes Y--a new, composite quaternary state of human hemoglobin.

Smith, F.R., Lattman, E.E., Carter Jr., C.W.

(1991) Proteins 10: 81-91

• PubMed: 1896430 
• DOI: 10.1002/prot.340100202


• PubMed Abstract: 
  

Carbonmonoxy hemoglobin Ypsilanti (beta 99 Asp-Tyr) exhibits a quaternary form distinctly different from any structures previously observed for human hemoglobins. The relative orientation of alpha beta dimers in the new quaternary form lies well outside the range of values observed for normal unliganded and liganded tetramers (Baldwin, J., Chothia, C., J. Mol. Biol. 129:175-220, 1979). Despite this large quaternary structural difference between carbonmonoxy hemoglobin Ypsilanti and the two canonical structures, the new quaternary structure's hydrogen bonding interactions in the "switch" region, and packing interactions in the "flexible joint" region, show noncovalent interactions characteristic of the alpha 1 beta 2 contacts of both unliganded and liganded normal hemoglobins. In contrast to both canonical structures, the beta 97 histidine residue in carbonmonoxy hemoglobin Ypsilanti is disengaged from quaternary packing interactions that are generally believed to enforce two-state behavior in ligand binding. These features of the new quaternary structure, denoted Y, may therefore be representative of quaternary states that occur transiently along pathways between the normal unliganded, T, and liganded, R, hemoglobin structures.

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Organizational Affiliation: 

Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill 27599-7260.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
HEMOGLOBIN YPSILANTI (CARBONMONOXY) (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 YPSILANTI (CARBONMONOXY) (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: 3 Å
• Space Group: P 3₂ 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 93.100	α = 90.00
b = 93.100	β = 90.00
c = 144.600	γ = 120.00

Software Package:

Software Name	Purpose
PROLSQ	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1992-09-18 
• Released Date: 1993-10-31 
• Deposition Author(s): Smith, F.R., Lattman, E.E., Carter Junior, C.W.

Revision History 

• Version 1.0: 1993-10-31
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance