2K1X

NMR solution structure of M-crystallin in calcium free form (apo).


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 400 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Solution structure and calcium-binding properties of M-crystallin, a primordial betagamma-crystallin from archaea.

Barnwal, R.P.Jobby, M.K.Devi, K.M.Sharma, Y.Chary, K.V.

(2009) J Mol Biol 386: 675-689

  • DOI: https://doi.org/10.1016/j.jmb.2008.12.058
  • Primary Citation of Related Structures:  
    2K1W, 2K1X

  • PubMed Abstract: 

    The lens betagamma-crystallin superfamily has many diverse but topologically related members belonging to various taxa. Based on structural topology, these proteins are considered to be evolutionarily related to lens crystallins, suggesting their origin from a common ancestor. Proteins with betagamma-crystallin domains, although found in some eukaryotes and eubacteria, have not yet been reported in archaea. Sequence searches in the genome of the archaebacterium Methanosarcina acetivorans revealed the presence of a protein annotated as a betagamma-crystallin family protein, named M-crystallin. Solution structure of this protein indicates a typical betagamma-crystallin fold with a paired Greek-key motif. Among the known structures of betagamma-crystallin members, M-crystallin was found to be structurally similar to the vertebrate lens betagamma-crystallins. The Ca(2+)-binding properties of this primordial protein are somewhat more similar to those of vertebrate betagamma-crystallins than to those of bacterial homologues. These observations, taken together, suggest that amphibian and vertebrate betagamma-crystallin domains are evolutionarily more related to archaeal homologues than to bacterial homologues. Additionally, identification of a betagamma-crystallin homologue in archaea allows us to demonstrate the presence of this domain in all the three domains of life.


  • Organizational Affiliation

    Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta/gama crystallin family protein85Methanosarcina acetivoransMutation(s): 0 
UniProt
Find proteins for Q8TMX3 (Methanosarcina acetivorans (strain ATCC 35395 / DSM 2834 / JCM 12185 / C2A))
Explore Q8TMX3 
Go to UniProtKB:  Q8TMX3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8TMX3
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 400 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-01-27
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2022-03-16
    Changes: Data collection, Database references, Derived calculations
  • Version 1.3: 2024-05-29
    Changes: Data collection