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- SASDAC9: Varkud Satellite (VS) ribozyme in Tris (Varkud Satellite (VS) rib... -
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Open data
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Basic information
Entry | Database: SASBDB / ID: SASDAC9 |
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![]() | Varkud Satellite (VS) ribozyme in Tris
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Biological species | ![]() |
![]() | ![]() Title: Crystal structure of the Varkud satellite ribozyme. Authors: Nikolai B Suslov / Saurja DasGupta / Hao Huang / James R Fuller / David M J Lilley / Phoebe A Rice / Joseph A Piccirilli / ![]() ![]() Abstract: The Varkud satellite (VS) ribozyme mediates rolling-circle replication of a plasmid found in the Neurospora mitochondrion. We report crystal structures of this ribozyme from Neurospora intermedia at ...The Varkud satellite (VS) ribozyme mediates rolling-circle replication of a plasmid found in the Neurospora mitochondrion. We report crystal structures of this ribozyme from Neurospora intermedia at 3.1 Å resolution, which revealed an intertwined dimer formed by an exchange of substrate helices. In each protomer, an arrangement of three-way helical junctions organizes seven helices into a global fold that creates a docking site for the substrate helix of the other protomer, resulting in the formation of two active sites in trans. This mode of RNA-RNA association resembles the process of domain swapping in proteins and has implications for RNA regulation and evolution. Within each active site, adenine and guanine nucleobases abut the scissile phosphate, poised to serve direct roles in catalysis. Similarities to the active sites of the hairpin and hammerhead ribozymes highlight the functional importance of active-site features, underscore the ability of RNA to access functional architectures from distant regions of sequence space, and suggest convergent evolution. |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
-Models
Model #358 | ![]() Type: dummy / Software: DAMMIN / Radius of dummy atoms: 4.00 A ![]() |
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Model #359 | ![]() Type: mix / Software: FoXS / Radius of dummy atoms: 1.90 A / Chi-square value: 680.308162367 ![]() |
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Sample
![]() | Name: Varkud Satellite (VS) ribozyme in Tris / Specimen concentration: 1.50-4.50 |
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Buffer | Name: Tris / Concentration: 10.00 mM / pH: 7.5 / Composition: 25 mM KCl and 5 mM MgCl2 |
Entity #217 | Name: G638A / Type: RNA / Description: Varkud Satellite (VS) ribozyme / Formula weight: 60.15 / Num. of mol.: 2 / Source: Neurospora Sequence: GGCGCUGUGU CGCAAUCUGC GAAGGGCGUC GUCGGCCCAA GCGGUAGUAA GCAGGGAACU CACCUCCAAU GAAACACAUU GUCGUAGCAG UUGACUACUG UUAUGUGAUU GGUAGAGGCU AAGUGACGGU AUUGGCGUAA GCCAAUACCG CAGCACAGCA CAAGCCCGCU UGCGAGAUUA CAGCGC |
-Experimental information
Beam | Instrument name: Advanced Light Source (ALS) 12.3.1 (SIBYLS) City: Berkeley, CA / 国: USA ![]() | |||||||||||||||||||||
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Detector | Name: Pilatus 2M | |||||||||||||||||||||
Scan |
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Distance distribution function P(R) |
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Result | Comments: SAXS data from a catalytically inactive construct support the overall conformation and dimeric state of the VS ribozyme in its x-ray crystal structure.
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