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| | ==Crystal structure of murine TFB1M in complex with SAM== | | ==Crystal structure of murine TFB1M in complex with SAM== |
| - | <StructureSection load='4gc9' size='340' side='right' caption='[[4gc9]], [[Resolution|resolution]] 2.10Å' scene=''> | + | <StructureSection load='4gc9' size='340' side='right'caption='[[4gc9]], [[Resolution|resolution]] 2.10Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4gc9]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Lk3_transgenic_mice Lk3 transgenic mice]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4GC9 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4GC9 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4gc9]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4GC9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4GC9 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=SAM:S-ADENOSYLMETHIONINE'>SAM</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene>, <scene name='pdbligand=SAM:S-ADENOSYLMETHIONINE'>SAM</scene></td></tr> |
| - | <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
| + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4gc9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4gc9 OCA], [https://pdbe.org/4gc9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4gc9 RCSB], [https://www.ebi.ac.uk/pdbsum/4gc9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4gc9 ProSAT]</span></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4gc5|4gc5]]</td></tr>
| + | |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Tfb1m ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10090 LK3 transgenic mice])</td></tr>
| + | |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4gc9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4gc9 OCA], [http://pdbe.org/4gc9 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4gc9 RCSB], [http://www.ebi.ac.uk/pdbsum/4gc9 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4gc9 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/TFB1M_MOUSE TFB1M_MOUSE]] S-adenosyl-L-methionine-dependent methyltransferase which specifically dimethylates mitochondrial 12S rRNA at the conserved stem loop. Also required for basal transcription of mitochondrial DNA, probably via its interaction with POLRMT and TFAM. Stimulates transcription independently of the methyltransferase activity (By similarity). | + | [https://www.uniprot.org/uniprot/TFB1M_MOUSE TFB1M_MOUSE] S-adenosyl-L-methionine-dependent methyltransferase which specifically dimethylates mitochondrial 12S rRNA at the conserved stem loop. Also required for basal transcription of mitochondrial DNA, probably via its interaction with POLRMT and TFAM. Stimulates transcription independently of the methyltransferase activity (By similarity). |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Lk3 transgenic mice]] | + | [[Category: Large Structures]] |
| - | [[Category: Garcia-Diaz, M]] | + | [[Category: Mus musculus]] |
| - | [[Category: Guja, K E]] | + | [[Category: Garcia-Diaz M]] |
| - | [[Category: Hambardjieva, E]] | + | [[Category: Guja KE]] |
| - | [[Category: Karzai, A W]] | + | [[Category: Hambardjieva E]] |
| - | [[Category: Mejia, E]] | + | [[Category: Karzai AW]] |
| - | [[Category: Shi, H]] | + | [[Category: Mejia E]] |
| - | [[Category: Venkataraman, K]] | + | [[Category: Shi H]] |
| - | [[Category: Yakubovskaya, E]] | + | [[Category: Venkataraman K]] |
| - | [[Category: Methylation]]
| + | [[Category: Yakubovskaya E]] |
| - | [[Category: Methyltransferase fold]]
| + | |
| - | [[Category: Mitochondria]]
| + | |
| - | [[Category: Rrna methyltransferase]]
| + | |
| - | [[Category: S-adenosyl-l-methionine]]
| + | |
| - | [[Category: Transferase]]
| + | |
| Structural highlights
Function
TFB1M_MOUSE S-adenosyl-L-methionine-dependent methyltransferase which specifically dimethylates mitochondrial 12S rRNA at the conserved stem loop. Also required for basal transcription of mitochondrial DNA, probably via its interaction with POLRMT and TFAM. Stimulates transcription independently of the methyltransferase activity (By similarity).
Publication Abstract from PubMed
Eukaryotic transcription factor B (TFB) proteins are homologous to KsgA/Dim1 ribosomal RNA (rRNA) methyltransferases. The mammalian TFB1, mitochondrial (TFB1M) factor is an essential protein necessary for mitochondrial gene expression. TFB1M mediates an rRNA modification in the small ribosomal subunit and thus plays a role analogous to KsgA/Dim1 proteins. This modification has been linked to mitochondrial dysfunctions leading to maternally inherited deafness, aminoglycoside sensitivity and diabetes. Here, we present the first structural characterization of the mammalian TFB1 factor. We have solved two X-ray crystallographic structures of TFB1M with (2.1 A) and without (2.0 A) its cofactor S-adenosyl-L-methionine. These structures reveal that TFB1M shares a conserved methyltransferase core with other KsgA/Dim1 methyltransferases and shed light on the structural basis of S-adenosyl-L-methionine binding and methyltransferase activity. Together with mutagenesis studies, these data suggest a model for substrate binding and provide insight into the mechanism of methyl transfer, clarifying the role of this factor in an essential process for mitochondrial function.
Structural basis for S-adenosylmethionine binding and methyltransferase activity by mitochondrial transcription factor B1.,Guja KE, Venkataraman K, Yakubovskaya E, Shi H, Mejia E, Hambardjieva E, Karzai AW, Garcia-Diaz M Nucleic Acids Res. 2013 Jun 26. PMID:23804760[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Guja KE, Venkataraman K, Yakubovskaya E, Shi H, Mejia E, Hambardjieva E, Karzai AW, Garcia-Diaz M. Structural basis for S-adenosylmethionine binding and methyltransferase activity by mitochondrial transcription factor B1. Nucleic Acids Res. 2013 Jun 26. PMID:23804760 doi:10.1093/nar/gkt547
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