Biological Assembly 1  

 3D View: Structure | Electron Density

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 43775.55 
• Atom Count: 2960 
• Residue Count: 389 
• Unique protein chains: 1

1XQJ

3.10 A Crystal structure of maspin, space group I 4 2 2

• DOI: 10.2210/pdb1XQJ/pdb

• Classification: ANTITUMOR PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): 8 


• Deposited: 2004-10-12 Released: 2004-10-26 
• Deposition Author(s): Al-Ayyoubi, M., Gettins, P.G., Volz, K.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.1 Å
• R-Value Free: 0.248 
• R-Value Work: 0.201 

Literature

Crystal Structure of Human Maspin, a Serpin with Antitumor Properties: Reactive Center Loop of Mapsin is Exposed but Constrained

Al-Ayyoubi, M., Gettins, P.G., Volz, K.

(2004) J.Biol.Chem. 279: 55540-55544

• PubMed: 15501821 
• DOI: 10.1074/jbc.M409957200
• Primary Citation of Related Structures:  
  1XQG


• PubMed Abstract: 
  

Maspin, a member of the serpin superfamily, has tumor suppressing activity against breast and prostate cancer. Maspin inhibits tumor growth by blocking cell invasion, and its reactive center loop (RCL) is thought to mediate this activity. To understand this function on the molecular level, we have solved the three-dimensional structure of Maspin to 3.1 A resolution. The molecular structure shows the characteristic features of the serpin fold, but the RCL of Maspin is unique in length, composition, and placement. Although the RCL of Maspin is accessible and cleavable by some proteinases, it functions in the uncleaved, constrained conformation observed here. These structural results will contribute to our understanding of the mechanism by which Maspin suppresses tumors.

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Organizational Affiliation: 

Department of Biochemistry and Molecular Biology, University of Illinois at Chicago, 835 S. Wolcott Avenue, Chicago, IL 60612-7334.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Maspin	A	389	Homo sapiens	Mutation(s): 8  Gene Names: SERPINB5 (PI5)
Find proteins for P36952 (Homo sapiens) Go to Gene View: SERPINB5 Go to UniProtKB:  P36952

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.1 Å
• R-Value Free: 0.248 
• R-Value Work: 0.201 
• Space Group: I 4 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 146.810	α = 90.00
b = 146.810	β = 90.00
c = 117.530	γ = 90.00

Software Package:

Software Name	Purpose
CNS	phasing
HKL-2000	data reduction
HKL-2000	data collection
CNS	refinement
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-10-12 
• Released Date: 2004-10-26 
• Deposition Author(s): Al-Ayyoubi, M., Gettins, P.G., Volz, K.

Revision History 

• Version 1.0: 2004-10-26
  Type: Initial release
• Version 1.1: 2008-04-30
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance