2JX5

Solution structure of the ubiquitin domain N-terminal to the S27a ribosomal subunit of Giardia lamblia


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Sequence and structure evolved separately in a ribosomal ubiquitin variant

Catic, A.Sun, Z.J.Ratner, D.M.Misaghi, S.Spooner, E.Samuelson, J.Wagner, G.Ploegh, H.L.

(2007) EMBO J. 26: 3474-3483

  • DOI: 10.1038/sj.emboj.7601772

  • PubMed Abstract: 
  • Encoded by a multigene family, ubiquitin is expressed in the form of three precursor proteins, two of which are fusions to the ribosomal subunits S27a and L40. Ubiquitin assists in ribosome biogenesis and also functions as a post-translational modifi ...

    Encoded by a multigene family, ubiquitin is expressed in the form of three precursor proteins, two of which are fusions to the ribosomal subunits S27a and L40. Ubiquitin assists in ribosome biogenesis and also functions as a post-translational modifier after its release from S27a or L40. However, several species do not conserve the ribosomal ubiquitin domains. We report here the solution structure of a distant variant of ubiquitin, found at the N-terminus of S27a in Giardia lamblia, referred to as GlUb(S27a). Despite the considerable evolutionary distance that separates ubiquitin from GlUb(S27a), the structure of GlUb(S27a) is largely identical to that of ubiquitin. The variant domain remains attached to S27a and is part of the assembled holoribosome. Thus, conservation of tertiary structure suggests a role of this variant as a chaperone, while conservation of the primary structure--necessary for ubiquitin's function as a post-translational modifier--is no longer required. Based on these observations, we propose a model to explain the origin of the widespread ubiquitin superfold in eukaryotes.


    Organizational Affiliation

    Department of Biology, Whitehead Institute for Biomedical Research and Massachusetts Institute of Technology, Cambridge, MA 02142, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GlUb(S27a)
A
69Giardia intestinalis (strain ATCC 50803 / WB clone C6)Mutation(s): 0 
Find proteins for A8BNY1 (Giardia intestinalis (strain ATCC 50803 / WB clone C6))
Go to UniProtKB:  A8BNY1
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2JX5 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-12-04
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance