1JTI

Loop-inserted Structure of P1-P1' Cleaved Ovalbumin Mutant R339T


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.199 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Loop-inserted and thermostabilized structure of P1-P1' cleaved ovalbumin mutant R339T.

Yamasaki, M.Arii, Y.Mikami, B.Hirose, M.

(2002) J.Mol.Biol. 315: 113-120

  • DOI: 10.1006/jmbi.2001.5056

  • PubMed Abstract: 
  • Ovalbumin is a member of a superfamily of serine proteinase inhibitors, known as the serpins. It is, however, non-inhibitory towards serine proteinases, and lacks the loop insertion mechanism common to the serpins due to unknown structural factors. M ...

    Ovalbumin is a member of a superfamily of serine proteinase inhibitors, known as the serpins. It is, however, non-inhibitory towards serine proteinases, and lacks the loop insertion mechanism common to the serpins due to unknown structural factors. Mutant ovalbumin, R339T, in which the P14 hinge residue is replaced, was produced and analyzed for its thermostability and three-dimensional structure. Differential scanning calorimetry revealed that the mutant ovalbumin, but not the wild-type protein, undergoes a marked thermostabilization (DeltaT(m)=15.8 degrees C) following the P1-P1' cleavage. Furthermore, the crystal structure, solved at 2.3 A resolution, clearly proved that the P1-P1' cleaved form assumes the fully loop-inserted conformation as seen in serpin that possess inhibitory activity. We therefore conclude that ovalbumin acquires the structural transition mechanism into the loop-inserted, thermostabilized form by the single hinge mutation. The mutant protein does not, however, possess inhibitory activity. The solved structure displays the occurrence of specific interactions that may prevent the smooth motion, relative to sheet A, of helices E and F and of the loop that follows helix F. These observations provide crucial insights into the question why R339T is still non-inhibitory.


    Organizational Affiliation

    Division of Applied Life Sciences, Kyoto University, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ovalbumin
A, B
385Gallus gallusGene Names: SERPINB14
Find proteins for P01012 (Gallus gallus)
Go to UniProtKB:  P01012
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.199 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 61.714α = 89.11
b = 65.465β = 63.27
c = 68.422γ = 61.72
Software Package:
Software NamePurpose
SADIEdata reduction
PHASESphasing
SADIEdata collection
SAINTdata scaling
CNSrefinement
SAINTdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-09-05
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance