The Open Protein Structure Annotation Network
PDB Keyword


    Table of contents
    1. 1. Protein Summary
    2. 2. Ligand Summary
    3. 3. References

    Title Crystal structure of Putative Inositol Catabolism Protein IolE (NP_786806.1) from Lactobacillus plantarum at 1.85 A resolution. To be published
    Site JCSG
    PDB Id 3cny Target Id 383008
    Molecular Characteristics
    Source Lactobacillus plantarum wcfs1
    Alias Ids TPS1768,NP_786806.1, _0023.000408_ Molecular Weight 33879.64 Da.
    Residues 300 Isoelectric Point 5.78
    Sequence msskaekdikwgiapigwrnddipsigkdnnlqqllsdivvagfqgtevggffpgpeklnyelklrnle iagqwfssyiirdgiekaseafekhcqylkainapvavvseqtytiqrsdtanifkdkpyftdkewdev ckglnhygeiaakyglkvayhhhmgtgiqtkeetdrlmantdpklvgllydtghiavsdgdymallnah idrvvhvhfkdvrrskeeecrakgltfqgsflngmftvpgdgdldfkpvydkliannykgwivveaeqd pskanplemaqiahryikqhlien
      BLAST   FFAS

    Structure Determination
    Method XRAY Chains 2
    Resolution (Å) 1.85 Rfree 0.210
    Matthews' coefficent 2.38 Rfactor 0.165
    Waters 750 Solvent Content 48.30

    Ligand Information


    Google Scholar output for 3cny

    Protein Summary

    The iolE (lp_3607) gene from Lactobacillus plantarum encodes the NP_786806.1 amino acid sequence that folds into a putative inosose dehydratase IolE , an enzyme involved in inositol metabolism. IolE catalyzes the following reaction:

    scyllo-inosose ---> D-2,3-Diketo-4-dexyo-epi-inositol

    Genome context analysis shows the iolE gene as part of the iol operon of L. plantarum. NP_786806.1 shares sequence similarity with the AP_endonuc_2  family (PF01261) from Pfam, annotated as xylose isomerase-like TIM barrels.

    3cny structure belongs to the SCOP TIM barrel fold, xylose isomerase-like superfamily, IolI-like family. A DALI search for structural similarity returns the AsbF protein PDB:3dx5 as top hit (Z=25), followed by xylose isomerase PDB:3ktc and TM0416 protein PDB:2zvr. 3cny bears structural similarity to many TIM barrel proteins such as the YGBM protein 1k77, the tagatose epimerase 2qul and the IolI protein 1i60 (Z=24), despite lack of sequence homology.

    The active site can be identified by comparison with the active site in the homologs (DxxH--//--HxxD). 3cny putative active site configuration is similar to PDB:2qul and PDB:1i60. However, not all residues are identical. For example, H159 of 3cny corresponds to Asp in 2qul and 1i60. The putative active site is buried between the N and C termini interfaces. There is a solvent channel for access.


    Ligand Summary






    No references found.

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