Biological Assembly 1  

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - AB 

Biological assembly 1 generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 41386.39 
• Atom Count: 2873 
• Residue Count: 368 
• Unique protein chains: 2

1QMB

Cleaved alpha-1-antitrypsin polymer

• DOI: 10.2210/pdb1QMB/pdb

• Classification: SERINE PROTEASE INHIBITOR
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): 1 


• Deposited: 1999-09-24 Released: 2000-02-06 
• Deposition Author(s): Huntington, J.A., Pannu, N.S., Hazes, B., Read, R.J., Lomas, D.A., Carrell, R.W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.6 Å
• R-Value Free: 0.258 
• R-Value Work: 0.212 

Literature

A 2.6A Structure of a Serpin Polymer and Implications for Conformational Disease

Huntington, J.A., Pannu, N.S., Hazes, B., Read, R.J., Lomas, D.A., Carrell, R.W.

(1999) J.Mol.Biol. 293: 449

• PubMed: 10543942 
• DOI: 10.1006/jmbi.1999.3184


• PubMed Abstract: 
  

The function of the serpins as proteinase inhibitors depends on their ability to insert the cleaved reactive centre loop as the fourth strand in the main A beta-sheet of the molecule upon proteolytic attack at the reactive centre, P1-P1'. This mechanism is vulnerable to mutations which result in inappropriate intra- or intermolecular loop insertion in the absence of cleavage. Intermolecular loop insertion is known as serpin polymerisation and results in a variety of diseases, most notably liver cirrhosis resulting from mutations of the prototypical serpin alpha1-antitrypsin. We present here the 2.6 A structure of a polymer of alpha1-antitrypsin cleaved six residues N-terminal to the reactive centre, P7-P6 (Phe352-Leu353). After self insertion of P14 to P7, intermolecular linkage is affected by insertion of the P6-P3 residues of one molecule into the partially occupied beta-sheet A of another. This results in an infinite, linear polymer which propagates in the crystal along a 2-fold screw axis. These findings provide a framework for understanding the uncleaved alpha1-antitrypsin polymer and fibrillar and amyloid deposition of proteins seen in other conformational diseases, with the ordered array of polymers in the crystal resulting from slow accretion of the cleaved serpin over the period of a year.

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Organizational Affiliation: 

Division of Structural Medicine, Department of Haematology, University of Cambridge, Cambridge Institute for Medical Research, Cambridge, CB2 2XY, UK.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
ALPHA-1-ANTITRYPSIN	A	326	Homo sapiens	Mutation(s): 0  Gene Names: SERPINA1 (AAT, PI)
Find proteins for P01009 (Homo sapiens) Go to Gene View: SERPINA1 Go to UniProtKB:  P01009

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
ALPHA-1-ANTITRYPSIN	B	42	Homo sapiens	Mutation(s): 1  Gene Names: SERPINA1 (AAT, PI)
Find proteins for P01009 (Homo sapiens) Go to Gene View: SERPINA1 Go to UniProtKB:  P01009

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.6 Å
• R-Value Free: 0.258 
• R-Value Work: 0.212 
• Space Group: P 3₁ 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 108.590	α = 90.00
b = 108.590	β = 90.00
c = 110.650	γ = 120.00

Software Package:

Software Name	Purpose
SCALA	data scaling
MOSFLM	data reduction
CNS	phasing
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-09-24 
• Released Date: 2000-02-06 
• Deposition Author(s): Huntington, J.A., Pannu, N.S., Hazes, B., Read, R.J., Lomas, D.A., Carrell, R.W.

Revision History 

• Version 1.0: 2000-02-06
  Type: Initial release
• Version 1.1: 2011-05-08
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance