1jn9: Difference between revisions

Revision as of 20:30, 1 July 2008

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File:1jn9.png

Template:STRUCTURE 1jn9

Structure of Putative Asparaginase Encoded by Escherichia coli ybiK GeneStructure of Putative Asparaginase Encoded by Escherichia coli ybiK Gene

Template:ABSTRACT PUBMED 18323626

About this StructureAbout this Structure

1JN9 is a Protein complex structure of sequences from Escherichia coli. Full crystallographic information is available from OCA.

ReferenceReference

Crystal packing of plant-type L-asparaginase from Escherichia coli., Michalska K, Borek D, Hernandez-Santoyo A, Jaskolski M, Acta Crystallogr D Biol Crystallogr. 2008 Mar;64(Pt 3):309-20. Epub 2008, Feb 20. PMID:18323626

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OCA

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-'''Structure of Putative Asparaginase Encoded by Escherichia coli ybiK Gene'''
+===Structure of Putative Asparaginase Encoded by Escherichia coli ybiK Gene===
-==Overview==
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-Plant-type L-asparaginases hydrolyze the side-chain amide bond of L-asparagine or its beta-peptides. They belong to the N-terminal nucleophile (Ntn) hydrolases and are synthesized as inactive precursor molecules. Activation occurs via the autoproteolytic release of two subunits, alpha and beta, the latter of which carries the nucleophile at its N-terminus. Crystallographic studies of plant-type asparaginases have focused on an Escherichia coli homologue (EcAIII), which has been crystallized in several crystal forms. Although they all belong to the same P2(1)2(1)2(1) space group with similar unit-cell parameters, they display different crystal-packing arrangements and thus should be classified as separate polymorphs. This variability stems mainly from different positions of the EcAIII molecules within the unit cell, although they also exhibit slight differences in orientation. The intermolecular interactions that trigger different crystal lattice formation are mediated by ions, which represent the most variable component of the crystallization conditions. This behaviour confirms recent observations that small molecules might promote protein crystal lattice formation.
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 [[Category: Autoproteolysis]]
 [[Category: Ntn hydrolase]]
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