3AJD

Crystal structure of ATRM4

Summary for 3AJD

• Entry DOI: 10.2210/pdb3ajd/pdb
• Related: 3A4T
• Descriptor: Putative methyltransferase MJ0026, GLYCEROL, ISOPROPYL ALCOHOL, ... (4 entities in total)
• Functional Keywords: trna, m5c, rossmann fold, structural genomics, riken structural genomics/proteomics initiative, rsgi, methyltransferase, s-adenosyl-l-methionine, transferase, nppsfa, national project on protein structural and functional analyses
• Biological source: Methanocaldococcus jannaschii (METHANOCOCCUS JANNASCHII)
• Cellular location: Cytoplasm (Potential): Q60343
• Total number of polymer chains: 1
• Total formula weight: 31687.31

Authors

Hirano, M.,Kuratani, M.,Yokoyama, S.,RIKEN Structural Genomics/Proteomics Initiative (RSGI) (deposition date: 2010-06-01, release date: 2010-06-30, Last modification date: 2024-10-23)

Primary citation

Kuratani, M.,Hirano, M.,Goto-Ito, S.,Itoh, Y.,Hikida, Y.,Nishimoto, M.,Sekine, S.,Bessho, Y.,Ito, T.,Grosjean, H.,Yokoyama, S.
Crystal structure of Methanocaldococcus jannaschii Trm4 complexed with sinefungin.
J.Mol.Biol., 401:323-333, 2010

PubMed Abstract: tRNA:m(5)C methyltransferase Trm4 generates the modified nucleotide 5-methylcytidine in archaeal and eukaryotic tRNA molecules, using S-adenosyl-l-methionine (AdoMet) as methyl donor. Most archaea and eukaryotes possess several Trm4 homologs, including those related to diseases, while the archaeon Methanocaldococcus jannaschii has only one gene encoding a Trm4 homolog, MJ0026. The recombinant MJ0026 protein catalyzed AdoMet-dependent methyltransferase activity on tRNA in vitro and was shown to be the M. jannaschii Trm4. We determined the crystal structures of the substrate-free M. jannaschii Trm4 and its complex with sinefungin at 1.27 A and 2.3 A resolutions, respectively. This AdoMet analog is bound in a negatively charged pocket near helix alpha8. This helix can adopt two different conformations, thereby controlling the entry of AdoMet into the active site. Adjacent to the sinefungin-bound pocket, highly conserved residues form a large, positively charged surface, which seems to be suitable for tRNA binding. The structure explains the roles of several conserved residues that were reportedly involved in the enzymatic activity or stability of Trm4p from the yeast Saccharomyces cerevisiae. We also discuss previous genetic and biochemical data on human NSUN2/hTrm4/Misu and archaeal PAB1947 methyltransferase, based on the structure of M. jannaschii Trm4.

PubMed: 20600111
DOI: 10.1016/j.jmb.2010.06.046

Experimental method

X-RAY DIFFRACTION (1.27 Å)