4CAA

CLEAVED ANTICHYMOTRYPSIN T345R


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.199 

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:  1AS4, 3CAA

  • 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: 
    • Burial of an Ion Pair in the Hydrophobic Core of Cleaved Ala-349->Arg Antichymotrypsin Compromises But Does not Obliterate Serpin Function
      Lukacs, C.M.,Rubin, H.,Christianson, D.W.
      () TO BE PUBLISHED --: --


    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
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.199 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 72.830α = 90.00
b = 83.510β = 90.00
c = 82.860γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
X-PLORphasing
X-PLORrefinement
X-PLORmodel building
SCALEPACKdata scaling

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: 2008-03-04
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance