1AS4

CLEAVED ANTICHYMOTRYPSIN A349R


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Engineering an anion-binding cavity in antichymotrypsin modulates the "spring-loaded" serpin-protease interaction.

Lukacs, C.M.Rubin, H.Christianson, D.W.

(1998) Biochemistry 37: 3297-3304

  • DOI: 10.1021/bi972359e
  • Primary Citation of Related Structures:  3CAA, 4CAA

  • PubMed Abstract: 
  • Expressed in a kinetically trapped folding state, a serpin couples the thermodynamic driving force of a massive beta-sheet rearrangement to the inhibition of a target protease. Hence, the serpin-protease interaction is the premier example of a "sprin ...

    Expressed in a kinetically trapped folding state, a serpin couples the thermodynamic driving force of a massive beta-sheet rearrangement to the inhibition of a target protease. Hence, the serpin-protease interaction is the premier example of a "spring-loaded" protein-protein interaction. Amino acid substitutions in the hinge region of a serpin reactive loop can weaken the molecular spring, which converts the serpin from an inhibitor into a substrate. To probe the molecular basis of this conversion, we report the crystal structure of A349R antichymotrypsin in the reactive loop cleaved state at 2.1 A resolution. This amino acid substitution does not block the beta-sheet rearrangement despite the burial of R349 in the hydrophobic core of the cleaved serpin along with a salt-linked acetate ion. The inhibitory activity of this serpin variant is not obliterated; remarkably, its inhibitory properties are anion-dependent due to the creation of an anion-binding cavity in the cleaved serpin.


    Related Citations: 
    • Arginine Substitutions in the Hinge Region of Antichymotrypsin Affect Serpin Beta-Sheet Rearrangement
      Lukacs, C.M.,Zhong, J.Q.,Plotnick, M.I.,Rubin, H.,Cooperman, B.S.,Christianson, D.W.
      (1996) Nat.Struct.Mol.Biol. 3: 888


    Organizational Affiliation

    Department of Chemistry, University of Pennsylvania, Philadelphia 19104, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ANTICHYMOTRYPSIN
A
341Homo sapiensGene Names: SERPINA3 (AACT)
Find proteins for P01011 (Homo sapiens)
Go to Gene View: SERPINA3
Go to UniProtKB:  P01011
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
ANTICHYMOTRYPSIN
B
37Homo sapiensGene Names: SERPINA3 (AACT)
Find proteins for P01011 (Homo sapiens)
Go to Gene View: SERPINA3
Go to UniProtKB:  P01011
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download SDF File 
Download CCD File 
B
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.198 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 71.700α = 90.00
b = 78.350β = 90.00
c = 79.230γ = 90.00
Software Package:
Software NamePurpose
CCP4data scaling
MOSFLMdata reduction
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-02-25
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance