Crystal packing of plant-type L-asparaginase from Escherichia coli

Karolina Michalska, Dominika Borek, Alejadra Hernändez-Santoyo, Mariusz Jaskolski

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Plant-type L-asparaginases hydrolyze the side-chain amide bond of L-asparagine or its β-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, α and β, the latter of which carries the nucleophile at its N-terminus. Crystallo-graphic 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 P212121 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.

Original languageEnglish (US)
Pages (from-to)309-320
Number of pages12
JournalActa Crystallographica Section D: Biological Crystallography
Volume64
Issue number3
DOIs
StatePublished - Feb 20 2008

Keywords

  • Asparaginases
  • Crystal packing
  • Isoaspartyl peptidases
  • Ntn hydrolases

ASJC Scopus subject areas

  • Structural Biology

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