Biochemical and structural characterization of 5′-methylthioadenosine nucleosidases from Arabidopsis thaliana

Eun Young Park, Woo Suk Choi, Seung Ick Oh, Kyung Nam Kim, Jeong Sheop Shin, Hyun Kyu Song

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

5′-Methylthioadenosine (MTA) and S-adenosylhomocysteine (SAH) are important metabolites in all living organisms. Two similar nucleosidases for hydrolyzing MTA in Arabidopsis thaliana (AtMTAN1 and AtMTAN2) exist, but only AtMTAN2 shows markedly broad substrate specificity for hydrolysis of SAH. To examine the biochemical characteristics of AtMTAN2, it was over-expressed in Escherichia coli and purified to homogeneity. Spectroscopic assays confirm AtMTAN2 catalyzes MTA as well as SAH hydrolysis, compared to AtMTAN1 which only hydrolyzes MTA. In addition, crystal structure of the AtMTAN2 enzyme in complex with, adenine was determined at 2.9 Å resolution. Finally, a structural comparison of AtMTAN2 performed with previously determined structures of AtMTAN1 and an E. coli homolog provides clues for the substrate specificity of MTA nucleosidases in A. thaliana.

Original languageEnglish
Pages (from-to)619-624
Number of pages6
JournalBiochemical and biophysical research communications
Volume381
Issue number4
DOIs
Publication statusPublished - 2009 Apr 17

Keywords

  • Adenine
  • Crystal structure
  • Flexible loop
  • MTA
  • Nucleosidase
  • Plant
  • SAH
  • Spectroscopic assay

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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