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Mining the Protein Data Bank to Differentiate Error from Structural Variation in Clustered Static Structures: An Examination of HIV Protease

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Author(s): Balasubramanian Venkatakrishnan | Miorel-Lucian Palii | Mavis Agbandje-McKenna | Robert McKenna

Journal: Viruses
ISSN 1999-4915

Volume: 4;
Issue: 3;
Start page: 348;
Date: 2012;
Original page

Keywords: B-factor and spatial variation | data mining | HIV protease | structure superposition

ABSTRACT
The Protein Data Bank (PDB) contains over 71,000 structures. Extensively studied proteins have hundreds of submissions available, including mutations, different complexes, and space groups, allowing for application of data-mining algorithms to analyze an array of static structures and gain insight about a protein’s structural variation and possibly its dynamics. This investigation is a case study of HIV protease (PR) using in-house algorithms for data mining and structure superposition through generalized formulæ that account for multiple conformations and fractional occupancies. Temperature factors (B-factors) are compared with spatial displacement from the mean structure over the entire study set and separately over bound and ligand-free structures, to assess the significance of structural deviation in a statistical context. Space group differences are also examined.

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