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| [[Image:2br2.gif|left|200px]] | | {{Seed}} |
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| {{STRUCTURE_2br2| PDB=2br2 | SCENE= }} | | {{STRUCTURE_2br2| PDB=2br2 | SCENE= }} |
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| '''RNASE PH CORE OF THE ARCHAEAL EXOSOME'''
| | ===RNASE PH CORE OF THE ARCHAEAL EXOSOME=== |
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| ==Overview==
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| The exosome is a 3' --> 5' exoribonuclease complex involved in RNA processing. We report the crystal structure of the RNase PH core complex of the Sulfolobus solfataricus exosome determined at a resolution of 2.8 A. The structure reveals a hexameric ring-like arrangement of three Rrp41-Rrp42 heterodimers, where both subunits adopt the RNase PH fold common to phosphorolytic exoribonucleases. Structure-guided mutagenesis reveals that the activity of the complex resides within the active sites of the Rrp41 subunits, all three of which face the same side of the hexameric structure. The Rrp42 subunit is inactive but contributes to the structuring of the Rrp41 active site. The high sequence similarity of this archaeal exosome to eukaryotic exosomes and its high structural similarity to the bacterial mRNA-degrading PNPase support a common basis for RNA-degrading machineries in all three domains of life. | | The line below this paragraph, {{ABSTRACT_PUBMED_15951817}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 15951817 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_15951817}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Rna degradation]] | | [[Category: Rna degradation]] |
| [[Category: Rnase ph]] | | [[Category: Rnase ph]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 20:40:26 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 13:47:18 2008'' |