The Open Protein Structure Annotation Network
PDB Keyword


    Title Crystal structure of an immunoglobulin-like protein (PA1606) from PSEUDOMONAS AERUGINOSA at 1.50 A resolution. To be published
    Site JCSG
    PDB Id 3n6y Target Id 416836
    Molecular Characteristics
    Source Pseudomonas aeruginosa pao1
    Alias Ids TPS33851,NP_250297.1, 327463 Molecular Weight 15459.74 Da.
    Residues 136 Isoelectric Point 5.07
    Sequence aqaevridgpieygvfesryqdfqpgervltrseqniqqttevpaklgtkfgmryqlsgkqegdtpltl lyltpgvvtpdgqrhdkfevvqklvpgaptdvmayeftephevvkgewrlmvfqgdrllaeksfdvr
      BLAST   FFAS

    Structure Determination
    Method XRAY Chains 2
    Resolution (Å) 1.50 Rfree 0.212
    Matthews' coefficent 2.21 Rfactor 0.181
    Waters 381 Solvent Content 44.38

    Ligand Information


    Google Scholar output for 3n6y
    1. Assessment of protein structure refinement in CASP9
    JL MacCallum, A Prez, MJ Schnieders - Proteins: Structure, , 2011 - Wiley Online Library
    2. Blind prediction of quaternary structures of homo-oligomeric proteins from amino acid sequences based on templates
    M Morita, M Kakuta, K Shimizu, S Nakamura - 2012 - hoajonline.com

    Protein Summary

    The protein NP_250297.1 is annotated as hypothetical protein.

    A sequence search at PFAM identifies NP_250297.1 to belong to the MG2 (PFAM:PF01835, macroglobulin) domain which is the domain of alpha-2-macroglobulin.

     Note from PFAM: This was added as a new family to Pfam PF12975 DUF3859. Seems to be a domain found associated within some LRR proteins and possibly at the C-terminus of a pentapeptide repeat protein. If you decide to publish it I might be able to push the sequence analysis a bit further.

    The monomer structure adopts a beta-sandwich fold shown below.



    The oligomeric state of the protein as analyzed by the PISA server is a monomer, although there are two copies of the protein present in the crystallographic asymmetric unit, shown below.



    A search for structurally similar proteins by DALI returns several hits, but with weak Z-scores.

    DALI Structural Homologs
    N PDB Z-score RMSD LALI NRES %ID Description
    1 2hr0 7.2 3.4 91 641 12 Complement C3 Beta Chain
    2 3g6j 7.1 2.9 87 642 13 Complement C3 Beta Chain
    3 2wii 7.1 2.9 87 640 13 Complement C3 Beta Chain
    4 2a74 7.0 3.4 91 630 12 Complement Component C3c
    5 2x41 6.9 3.5 94 715 12 Beta-glucosidase
    6 2x42 6.8 3.5 94 715 12 Beta-glucosidase
    7 2x40 6.8 3.5 94 713 12 Beta-glucosidase
    8 2wt6 6.8 3.6 94 713 12 Beta-glucosidase
    9 2wt5 6.8 3.5 94 715 12 Beta-glucosidase
    10 2wt3 6.8 3.5 94 715 12 Beta-glucosidase

    A superposition of NP_250297.1 (green) with the top scoring protein, 2hr0 (magenta), shows that the superposition is limited to a small fragment of the total protein.


    Therefore the function of NP_250297.1 is difficult to infer from this analysis.

    Ligand Summary




    No references found.

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