Preliminary X-ray analysis of twinned crystals of sarcosine dimethylglycine methyltransferase from Halorhodospira halochoris

J.P. Kallio, J. Jänis, Antti Nyyssölä, N. Hakulinen, J. Rouvinen (Corresponding Author)

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Abstract

Sarcosine dimethylglycine methyltransferase (EC 2.1.1.157) is an enzyme from the extremely halophilic anaerobic bacterium Halorhodospira halochoris. This enzyme catalyzes the twofold methylation of sarcosine to betaine, with S-­adenosylmethionine (AdoMet) as the methyl-group donor. This study presents the crystallization and preliminary X-ray analysis of recombinant sarcosine dimethylglycine methyltransferase produced in Escherichia coli. Mass spectroscopy was used to determine the purity and homogeneity of the enzyme material. Two different crystal forms, which initially appeared to be hexagonal and tetragonal, were obtained. However, on analyzing the diffraction data it was discovered that both crystal forms were pseudo-merohedrally twinned. The true crystal systems were monoclinic and orthorhombic. The monoclinic crystal diffracted to a maximum of 2.15 Å resolution and the orthorhombic crystal diffracted to 1.8 Å resolution.
Original languageEnglish
Pages (from-to)805-808
Number of pages4
JournalActa Crystallographica Section F: Structural Biology and Crystallization Communications
Volume65
Issue number8
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

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Keywords

  • Halorhodospira halochoris
  • Sarcosine dimethylglycine methyltransferase
  • Twinning

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