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PiQSi specifications


Unique identifier OMICS_26207
Name PiQSi
Alternative name Protein Quaternary Structure Investigation
Restrictions to use None
Community driven No
Data access File download, Browse
User data submission Not allowed
Maintained Yes


  • Bacteria
    • Escherichia coli
  • Primates
    • Homo sapiens


  • person_outline Emmanuel D Levy

Publication for Protein Quaternary Structure Investigation

PiQSi citations


PDBe: towards reusable data delivery infrastructure at protein data bank in Europe

Nucleic Acids Res
PMCID: 5753225
PMID: 29126160
DOI: 10.1093/nar/gkx1070

[…] e quaternary structure. The component also displays a confidence measure that estimates the probability of a particular quaternary structure being a biologically relevant assembly () and links to the PiQsi pages for further details.LiteMol 3D Viewer: Integral to understanding macromolecular structure data and elucidating function is the ability to view these data in 3D. With the advent of WebGL an […]


Extent of Structural Asymmetry in Homodimeric Proteins: Prevalence and Relevance

PLoS One
PMCID: 3358323
PMID: 22629324
DOI: 10.1371/journal.pone.0036688

[…] The dataset of biologically relevant homodimers was taken from PiQSi in 2009 , since it is manually curated (n = 3251). Only entities containing more than one chain in the asymmetric unit were considered to avoid cases of perfect crystallographic symmetry. The se […]


Stability of domain structures in multi domain proteins

Sci Rep
PMCID: 3216527
PMID: 22355559
DOI: 10.1038/srep00040

[…] We obtained a set of single and two-domain monomeric proteins from PDB. Monomeric proteins have been identified by consulting PiQSi and PISA. We used domain boundaries as proposed by SCOP database. These structures were filtered using resolution cut-off of 2.5 Å and sequence identity cut-off of 40%. The SCOP families corresp […]


Relative Solvent Accessible Surface Area Predicts Protein Conformational Changes upon Binding

PMCID: 3145976
PMID: 21645856
DOI: 10.1016/j.str.2011.03.010

[…] we only considered monomers identified by PISA where both the asymmetric unit and the PDB biological unit contained single chains, and which were not identified as having more than one subunit in the PiQSi database of manually curated quaternary structure (). We also filtered out protein complexes that had only a single chain in either their asymmetric unit or PDB biological unit, or that were ide […]


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PiQSi institution(s)
MRC Laboratory of Molecular Biology, Cambridge, UK
PiQSi funding source(s)
Supported by the Medical Research Council and the European Molecular Biology Organization Young Investigators Programme.

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