2J9I

Lengsin is a survivor of an ancient family of class I glutamine synthetases in eukaryotes that has undergone evolutionary re- engineering for a tissue-specific role in the vertebrate eye lens.


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 17.0 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Lengsin is a Survivor of an Ancient Family of Class I Glutamine Synthetases Re-Engineered by Evolution for a Role in the Vertebrate Lens.

Wyatt, K.White, H.E.Wang, L.Bateman, O.A.Slingsby, C.Orlova, E.V.Wistow, G.

(2006) Structure 14: 1823

  • DOI: 10.1016/j.str.2006.10.008
  • Primary Citation of Related Structures:  
    2J9I

  • PubMed Abstract: 
  • Lengsin is a major protein of the vertebrate eye lens. It belongs to the hitherto purely prokaryotic GS I branch of the glutamine synthetase (GS) superfamily, but has no enzyme activity. Like the taxon-specific crystallins, Lengsin is the result of the recruitment of an ancient enzyme to a noncatalytic role in the vertebrate lens ...

    Lengsin is a major protein of the vertebrate eye lens. It belongs to the hitherto purely prokaryotic GS I branch of the glutamine synthetase (GS) superfamily, but has no enzyme activity. Like the taxon-specific crystallins, Lengsin is the result of the recruitment of an ancient enzyme to a noncatalytic role in the vertebrate lens. Cryo-EM and modeling studies of Lengsin show a dodecamer structure with important similarities and differences with prokaryotic GS I structures. GS homology regions of Lengsin are well conserved, but the N-terminal domain shows evidence of dynamic evolutionary changes. Compared with birds and fish, most mammals have an additional exon corresponding to part of the N-terminal domain; however, in human, this is a nonfunctional pseudoexon. Genes related to Lengsin are also present in the sea urchin, suggesting that this branch of the GS I family, supplanted by GS II enzymes in vertebrates, has an ancient role in metazoans.


    Organizational Affiliation

    Section on Molecular Structure and Functional Genomics, National Eye Institute, National Institutes of Health, Bethesda, Maryland 20892, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
GLUTAMATE-AMMONIA LIGASE DOMAIN-CONTAINING PROTEIN 1
A, B, C, D, E, F, G, H
A, B, C, D, E, F, G, H, I, J, K, L
421Mus musculusMutation(s): 0 
Gene Names: LgsnGluld1Lgs
UniProt
Find proteins for Q8CIX8 (Mus musculus)
Explore Q8CIX8 
Go to UniProtKB:  Q8CIX8
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 17.0 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-12-13
    Type: Initial release
  • Version 1.1: 2013-08-07
    Changes: Derived calculations, Other, Refinement description, Source and taxonomy, Version format compliance
  • Version 1.2: 2017-08-23
    Changes: Data collection
  • Version 1.3: 2019-10-23
    Changes: Data collection, Other