1KCT

ALPHA1-ANTITRYPSIN

• PDB DOI: https://doi.org/10.2210/pdb1KCT/pdb

• Classification: SERINE PROTEASE INHIBITOR
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 1996-08-06 Released: 1997-01-11 
• Deposition Author(s): Song, H.K., Suh, S.W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.46 Å
• R-Value Work: 0.184 
• R-Value Observed: 0.184 

Literature

Crystal structure of an uncleaved alpha 1-antitrypsin reveals the conformation of its inhibitory reactive loop.

Song, H.K., Lee, K.N., Kwon, K.S., Yu, M.H., Suh, S.W.

(1995) FEBS Lett 377: 150-154

• PubMed: 8543039 
• DOI: https://doi.org/10.1016/0014-5793(95)01331-8
• Primary Citation of Related Structures:  
  1KCT


• PubMed Abstract: 
  

  The crystal structure of a recombinant human alpha 1-antitrypsin, in the uncleaved and uncomplexed state, has been determined by X-ray crystallographic methods and refined to an R-factor of 18.4% for 8.0-3.46 A data with good stereochemistry. This structure provides the first view at the inhibitory loop and the central beta-sheet A of the uncleaved alpha 1-antitrypsin. The reactive loop takes a distorted helical conformation and no pre-insertion of two residues in the reactive loop into the beta-sheet A is observed. The present structure is largely in agreement with the model predicted by Engh, Wright, and Huber [Prot. Eng. 3 (1990) 469-477].

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Organizational Affiliation: 

Department of Chemistry, Seoul National University, South Korea.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 44.3 kDa 
• Atom Count: 2,965 
• Modelled Residue Count: 375 
• Deposited Residue Count: 394 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ALPHA1-ANTITRYPSIN	A	394	Homo sapiens	Mutation(s): 3  Gene Names: A1AT
UniProt & NIH Common Fund Data Resources
Find proteins for P01009 (Homo sapiens) Explore P01009  Go to UniProtKB:  P01009
PHAROS:  P01009 GTEx:  ENSG00000197249

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.46 Å
• R-Value Work: 0.184 
• R-Value Observed: 0.184 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 114.87	α = 90
b = 39.98	β = 102.82
c = 92.42	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
MADNES	data reduction
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1997-01-11 
Deposition Author(s): Song, H.K., Suh, S.W.

Revision History  

• Version 1.0: 1997-01-11
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-04-18
  Changes: Data collection, Other
• Version 1.4: 2021-11-03
  Changes: Database references
• Version 1.5: 2024-02-07
  Changes: Data collection