1N4I

Solution structure of spruce budworm antifreeze protein at 5 degrees celsius


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 25 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Spruce Budworm Antifreeze Protein: Changes in Structure and Dynamics at Low Temperature

Graether, S.P.Gagne, S.M.Spyracopoulos, L.Jia, Z.Davies, P.L.Sykes, B.D.

(2003) J.Mol.Biol. 327: 1155-1168


  • PubMed Abstract: 
  • Antifreeze proteins (AFPs) prevent the growth of ice, and are used by some organisms that live in sub-zero environments for protection against freezing. All AFPs are thought to function by an adsorption inhibition process. In order to elucidate the i ...

    Antifreeze proteins (AFPs) prevent the growth of ice, and are used by some organisms that live in sub-zero environments for protection against freezing. All AFPs are thought to function by an adsorption inhibition process. In order to elucidate the ice-binding mechanism, the structures of several AFPs have been determined, and have been shown to consist of different folds. Recently, the first structures of the highly active insect AFPs have been characterized. These proteins have a beta-helix structure, which adds yet another fold to the AFP family. The 90-residue spruce budworm (Choristoneura fumiferana) AFP consists of a beta-helix with 15 residues per coil. The structure contains two ranks of aligned threonine residues (known as the TXT motif), which were shown by mutagenesis experiments to be located in the ice-binding face. In our previous NMR study of this AFP at 30 degrees C, we found that the TXT face was not optimally defined because of the broadening of NMR resonances potentially due to weak oligomerization. We present here a structure of spruce budworm AFP determined at 5 degrees C, where this broadening is reduced. In addition, the 1H-15N NMR dynamics of the protein were examined at 30 degrees C and 5 degrees C. The results show that the spruce budworm AFP is more structured at 5 degrees C, and support the general observation that AFPs become more rigid as the temperature is lowered.


    Related Citations: 
    • Beta-helix structure and ice-binding properties of a hyperactive antifreeze protein from an insect
      Graether, S.P.,Kuiper, M.J.,Gagne, S.M.,Walkver, V.K.,Jia, Z.,Sykes, B.D.,Davies, P.L.
      (2000) Nature 406: 325


    Organizational Affiliation

    Department of Biochemistry, CIHR Group in Structure and Function, University of Alberta, 713, Heritage Medical Research Building, T6G 2H7, Edmonton, Alta., Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
thermal hysteresis protein
A
90Choristoneura fumiferanaN/A
Find proteins for Q9GTP0 (Choristoneura fumiferana)
Go to UniProtKB:  Q9GTP0
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 25 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 1N4I Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-04-08
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance