|
|
| (One intermediate revision not shown.) |
| Line 1: |
Line 1: |
| | | | |
| | ==Structure of the human mitochondrial transcription initiation complex at the HSP promoter== | | ==Structure of the human mitochondrial transcription initiation complex at the HSP promoter== |
| - | <StructureSection load='6erq' size='340' side='right' caption='[[6erq]], [[Resolution|resolution]] 4.50Å' scene=''> | + | <StructureSection load='6erq' size='340' side='right'caption='[[6erq]], [[Resolution|resolution]] 4.50Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[6erq]] is a 10 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6ERQ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6ERQ FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[6erq]] is a 10 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6ERQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6ERQ FirstGlance]. <br> |
| - | </td></tr><tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/DNA-directed_RNA_polymerase DNA-directed RNA polymerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.6 2.7.7.6] </span></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 4.5Å</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=6erq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6erq OCA], [http://pdbe.org/6erq PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6erq RCSB], [http://www.ebi.ac.uk/pdbsum/6erq PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6erq ProSAT]</span></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=6erq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6erq OCA], [https://pdbe.org/6erq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6erq RCSB], [https://www.ebi.ac.uk/pdbsum/6erq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6erq ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/RPOM_HUMAN RPOM_HUMAN]] DNA-dependent RNA polymerase catalyzes the transcription of mitochondrial DNA into RNA using the four ribonucleoside triphosphates as substrates.<ref>PMID:21278163</ref> [[http://www.uniprot.org/uniprot/TFAM_HUMAN TFAM_HUMAN]] Binds to the mitochondrial light strand promoter and functions in mitochondrial transcription regulation. Required for accurate and efficient promoter recognition by the mitochondrial RNA polymerase. Promotes transcription initiation from the HSP1 and the light strand promoter by binding immediately upstream of transcriptional start sites. Is able to unwind DNA. Bends the mitochondrial light strand promoter DNA into a U-turn shape via its HMG boxes. Required for maintenance of normal levels of mitochondrial DNA. May play a role in organizing and compacting mitochondrial DNA.<ref>PMID:1737790</ref> <ref>PMID:20410300</ref> <ref>PMID:19304746</ref> <ref>PMID:22037172</ref> <ref>PMID:22037171</ref> [[http://www.uniprot.org/uniprot/TFB2M_HUMAN TFB2M_HUMAN]] 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. Compared to TFB1M, it activates transcription of mitochondrial DNA more efficiently, while it has less methyltransferase activity.<ref>PMID:12068295</ref> <ref>PMID:12897151</ref> <ref>PMID:15526033</ref> <ref>PMID:20410300</ref> | + | [https://www.uniprot.org/uniprot/TFAM_HUMAN TFAM_HUMAN] Binds to the mitochondrial light strand promoter and functions in mitochondrial transcription regulation. Required for accurate and efficient promoter recognition by the mitochondrial RNA polymerase. Promotes transcription initiation from the HSP1 and the light strand promoter by binding immediately upstream of transcriptional start sites. Is able to unwind DNA. Bends the mitochondrial light strand promoter DNA into a U-turn shape via its HMG boxes. Required for maintenance of normal levels of mitochondrial DNA. May play a role in organizing and compacting mitochondrial DNA.<ref>PMID:1737790</ref> <ref>PMID:20410300</ref> <ref>PMID:19304746</ref> <ref>PMID:22037172</ref> <ref>PMID:22037171</ref> |
| | + | |
| | + | ==See Also== |
| | + | *[[RNA polymerase 3D structures|RNA polymerase 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: DNA-directed RNA polymerase]] | + | [[Category: Homo sapiens]] |
| - | [[Category: Cramer, P]] | + | [[Category: Large Structures]] |
| - | [[Category: Hillen, H S]] | + | [[Category: Cramer P]] |
| - | [[Category: Morozov, Y I]] | + | [[Category: Hillen HS]] |
| - | [[Category: Sarfallah, A]] | + | [[Category: Morozov YI]] |
| - | [[Category: Temiakov, D]] | + | [[Category: Sarfallah A]] |
| - | [[Category: Initiation]]
| + | [[Category: Temiakov D]] |
| - | [[Category: Mitochondria]]
| + | |
| - | [[Category: Polymerase]]
| + | |
| - | [[Category: Transcription]]
| + | |
| Structural highlights
Function
TFAM_HUMAN Binds to the mitochondrial light strand promoter and functions in mitochondrial transcription regulation. Required for accurate and efficient promoter recognition by the mitochondrial RNA polymerase. Promotes transcription initiation from the HSP1 and the light strand promoter by binding immediately upstream of transcriptional start sites. Is able to unwind DNA. Bends the mitochondrial light strand promoter DNA into a U-turn shape via its HMG boxes. Required for maintenance of normal levels of mitochondrial DNA. May play a role in organizing and compacting mitochondrial DNA.[1] [2] [3] [4] [5]
See Also
References
- ↑ Fisher RP, Lisowsky T, Parisi MA, Clayton DA. DNA wrapping and bending by a mitochondrial high mobility group-like transcriptional activator protein. J Biol Chem. 1992 Feb 15;267(5):3358-67. PMID:1737790
- ↑ Litonin D, Sologub M, Shi Y, Savkina M, Anikin M, Falkenberg M, Gustafsson CM, Temiakov D. Human mitochondrial transcription revisited: only TFAM and TFB2M are required for transcription of the mitochondrial genes in vitro. J Biol Chem. 2010 Jun 11;285(24):18129-33. doi: 10.1074/jbc.C110.128918. Epub, 2010 Apr 21. PMID:20410300 doi:http://dx.doi.org/10.1074/jbc.C110.128918
- ↑ Gangelhoff TA, Mungalachetty PS, Nix JC, Churchill ME. Structural analysis and DNA binding of the HMG domains of the human mitochondrial transcription factor A. Nucleic Acids Res. 2009 Jun;37(10):3153-64. Epub 2009 Mar 20. PMID:19304746 doi:10.1093/nar/gkp157
- ↑ Rubio-Cosials A, Sidow JF, Jimenez-Menendez N, Fernandez-Millan P, Montoya J, Jacobs HT, Coll M, Bernado P, Sola M. Human mitochondrial transcription factor A induces a U-turn structure in the light strand promoter. Nat Struct Mol Biol. 2011 Oct 30;18(11):1281-9. doi: 10.1038/nsmb.2160. PMID:22037172 doi:10.1038/nsmb.2160
- ↑ Ngo HB, Kaiser JT, Chan DC. The mitochondrial transcription and packaging factor Tfam imposes a U-turn on mitochondrial DNA. Nat Struct Mol Biol. 2011 Oct 30;18(11):1290-6. doi: 10.1038/nsmb.2159. PMID:22037171 doi:10.1038/nsmb.2159
|
