Structural Rearrangements in the Active Site of the Thermus thermophilus 16S rRNA Methyltransferase KsgA in a Binary Complex with 5′-Methylthioadenosine
Autor: | Emilia Seri, Steven T. Gregory, Hasan DeMirci, Albert E. Dahlberg, Claudio O. Gualerzi, Riccardo Belardinelli, Gerwald Jogl |
---|---|
Rok vydání: | 2009 |
Předmět: |
Adenosine
Binding Sites Thionucleosides Methyltransferase Deoxyadenosines biology Protein Conformation Thermus thermophilus Active site RNA Methyltransferases Methylation Ribosomal RNA Crystallography X-Ray biology.organism_classification Article Biochemistry Structural Biology Catalytic Domain biology.protein 30S Molecular Biology Magnesium ion Protein Binding |
Zdroj: | Journal of Molecular Biology. 388:271-282 |
ISSN: | 0022-2836 |
Popis: | Posttranscriptional modification of ribosomal RNA (rRNA) occurs in all kingdoms of life. The S-adenosyl-L-methionine-dependent methyltransferase KsgA introduces the most highly conserved rRNA modification, the dimethylation of A1518 and A1519 of 16S rRNA. Loss of this dimethylation confers resistance to the antibiotic kasugamycin. Here, we report biochemical studies and high-resolution crystal structures of KsgA from Thermus thermophilus. Methylation of 30S ribosomal subunits by T. thermophilus KsgA is more efficient at low concentrations of magnesium ions, suggesting that partially unfolded RNA is the preferred substrate. The overall structure is similar to that of other methyltransferases but contains an additional alpha-helix in a novel N-terminal extension. Comparison of the apoenzyme with complex structures with 5'-methylthioadenosine or adenosine bound in the cofactor-binding site reveals novel features when compared with related enzymes. Several mobile loop regions that restrict access to the cofactor-binding site are observed. In addition, the orientation of residues in the substrate-binding site indicates that conformational changes are required for binding two adjacent residues of the substrate rRNA. |
Databáze: | OpenAIRE |
Externí odkaz: |