1XU6

Structure of the C-terminal domain from Trypanosoma brucei Variant Surface Glycoprotein MITat1.2


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 60 
  • 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

Structure of the C-terminal domain from Trypanosoma brucei variant surface glycoprotein MITat1.2

Chattopadhyay, A.Jones, N.G.Nietlispach, D.Nielsen, P.R.Voorheis, H.P.Mott, H.R.Carrington, M.

(2004) J.Biol.Chem. 280: 7228-7235

  • DOI: 10.1074/jbc.M410787200

  • PubMed Abstract: 
  • The variant surface glycoprotein (VSG) of African trypanosomes has a structural role in protecting other cell surface proteins from effector molecules of the mammalian immune system and also undergoes antigenic variation necessary for a persistent in ...

    The variant surface glycoprotein (VSG) of African trypanosomes has a structural role in protecting other cell surface proteins from effector molecules of the mammalian immune system and also undergoes antigenic variation necessary for a persistent infection in a host. Here we have reported the solution structure of a VSG type 2 C-terminal domain from MITat1.2, completing the first structure of both domains of a VSG. The isolated C-terminal domain is a monomer in solution and forms a novel fold, which commences with a short alpha-helix followed by a single turn of 3(10)-helix and connected by a short loop to a small anti-parallel beta-sheet and then a longer alpha-helix at the C terminus. This compact domain is flanked by two unstructured regions. The structured part of the domain contains 42 residues, and the core comprises 2 disulfide bonds and 2 hydrophobic residues. These cysteines and hydrophobic residues are conserved in other VSGs, and we have modeled the structures of two further VSG C-terminal domains using the structure of MITat1.2. The models suggest that the overall structure of the core is conserved in the different VSGs but that the C-terminal alpha-helix is of variable length and depends on the presence of charged residues. The results provided evidence for a conserved tertiary structure for all the type 2 VSG C-terminal domains, indicated that VSG dimers form through interactions between N-terminal domains, and showed that the selection pressure for sequence variation within a conserved tertiary structure acts on the whole of the VSG molecule.


    Organizational Affiliation

    Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Variant surface glycoprotein MITAT 1.2
A
80Trypanosoma brucei bruceiMutation(s): 0 
Find proteins for P26332 (Trypanosoma brucei brucei)
Go to UniProtKB:  P26332
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 60 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 1XU6 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-11-30
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Source and taxonomy, Version format compliance