Preliminary structural studies on the MtxX protein from Methanococcus jannaschii

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Abstract

Methanococcus jannaschii has an mtr gene cluster expressing N 5-methyltetrahydromethanopterin:coenzyme M methyltransferase, which generates methane by reducing CO2 with H2 with concomitant energy production under strictly anaerobic conditions. Some methanogenic archaea also have an mtr gene-cluster homologue, the mtxXAH gene cluster. M. jannaschii has both an entire mtr gene cluster and a single mtxX gene instead of the whole mtxXAH gene cluster. A PSI-BLAST search, secondary-structure prediction and the absence of phosphotransacetylase activity in M. jannaschii strongly support the possibility that the MtxX protein constitutes a unique methyltransferase family. In this study, the MtxX protein from M. jannaschii has been cloned, expressed, purified and crystallized. Synchrotron data were collected to 2.9 Å from a crystal of selenomethionine-substituted MtxX protein. The crystal belonged to the primitive hexagonal space group P6122, with unit-cell parameters a = 54.9, b = 54.9, c = 341.1 Å, β = 120.0°. A full structure determination is under way in order to provide insight into the structure-function relationship of this protein.

Original languageEnglish
Pages (from-to)300-303
Number of pages4
JournalActa Crystallographica Section F: Structural Biology and Crystallization Communications
Volume64
Issue number4
DOIs
StatePublished - 29 Mar 2008

Keywords

  • Methanococcus jannaschii
  • MtxX

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