Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 68329.56 
• Atom Count: 4758 
• Residue Count: 585 
• Unique protein chains: 1

1N5U

X-RAY STUDY OF HUMAN SERUM ALBUMIN COMPLEXED WITH HEME

• DOI: 10.2210/pdb1N5U/pdb

• Classification: PLASMA PROTEIN
• Organism(s): Homo sapiens


• Deposited: 2002-11-07 Released: 2003-06-24 
• Deposition Author(s): Wardell, M., Wang, Z., Ho, J.X., Robert, J., Ruker, F., Ruble, J., Carter, D.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.9 Å
• R-Value Free: 0.280 
• R-Value Work: 0.235 

Literature

The Atomic Structure of Human Methemalbumin at 1.9 A

Wardell, M., Wang, Z., Ho, J.X., Robert, J., Ruker, F., Ruble, J., Carter, D.C.

(2002) Biochem.Biophys.Res.Commun. 291: 813-819

• PubMed: 11866438 
• DOI: 10.1006/bbrc.2002.6540


• PubMed Abstract: 
  

The high resolution structure of hemalbumin was determined by single crystal X-ray diffraction to a resolution of 1.9 A. The structure revealed the protoporphyrin IX bound to a single site within a hydrophobic cavity in subdomain IB, one of the principal binding sites for long chain fatty acid. The iron is penta coordinated with the fifth ligand comprised of the hydroxyl oxygen of Tyr-161 (phenolic oxygen to heme plane distance: 2.73 A) in an otherwise completely hydrophobic pocket. The heme propionic acid residues form salt bridges with His-142 and Lys-190, which together with a series of hydrophobic interactions, enclose and secure the heme within the IB helical motif. A detailed discussion of the structure together with its implications for the development of potential blood substitutes is presented.

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Related Citations: 

• Structure of Human Serum Albumin
  Carter, D.C.,He, X.M.
  (1990) Science 249: 302
• Three-Dimensional Structure of Human Serum Albumin
  Carter, D.C.,He, X.M.,Munson, S.H.,Twigg, P.D.,Gernert, K.M.,Broom, M.B.,Miller, T.Y.
  (1989) Science 244: 1195
• Preliminary Crystallographic Studies of Four Crystal Forms of Serum Albumin
  Carter, D.C.,Chang, B.,Ho, J.X.,Keeling, K.,Krishnasami, Z.
  (1994) Eur.J.Biochem. 226: 1049
• Atomic Structure and Chemistry of Human Serum Albumin
  He, X.M.,Carter, D.C.
  (1992) Nature 358: 209




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Organizational Affiliation: 

New Century Pharmaceuticals, Inc., 895 Martin Road, Huntsville, Alabama 35824, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
SERUM ALBUMIN	A	585	Homo sapiens	Gene Names: ALB
Find proteins for P02768 (Homo sapiens) Go to Gene View: ALB Go to UniProtKB:  P02768

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
MYR	A	MYRISTIC ACID C14 H28 O2 TUNFSRHWOTWDNC-UHFFFAOYSA-N
HEM	A	PROTOPORPHYRIN IX CONTAINING FE HEME C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.9 Å
• R-Value Free: 0.280 
• R-Value Work: 0.235 
• Space Group: C 1 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 183.116	α = 90.00
b = 37.909	β = 105.04
c = 94.832	γ = 90.00

Software Package:

Software Name	Purpose
MERLOT	phasing
CNX	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-11-07 
• Released Date: 2003-06-24 
• Deposition Author(s): Wardell, M., Wang, Z., Ho, J.X., Robert, J., Ruker, F., Ruble, J., Carter, D.C.

Revision History 

• Version 1.0: 2003-06-24
  Type: Initial release
• Version 1.1: 2008-04-28
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance