2a8q: Difference between revisions
New page: left|200px<br /><applet load="2a8q" size="350" color="white" frame="true" align="right" spinBox="true" caption="2a8q, resolution 2.600Å" /> '''2.6 Angstrom Crysta... |
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==Overview== | ==Overview== | ||
X29, a 25 kDa Nudix hydrolase from Xenopus laevis that cleaves 5' caps | X29, a 25 kDa Nudix hydrolase from Xenopus laevis that cleaves 5' caps from U8 snoRNA, crystallizes as a homodimeric apoenzyme. Manganese binds crystals of apo-X29 to form holo-X29 only in the presence of nucleot(s)ide. Structural changes in X29 on nucleo-t(s)ide-assisted Mn(+2) uptake account for the observed cooperativity of metal binding. Structures of X29 with GTP or m7GpppA show a different mode of ligand binding from that of other cap binding proteins and suggest a possible three- or four-metal Nudix reaction mechanism. The X29 dimer has no known RNA binding motif, but its striking surface dipolarity and unique structural features create a plausible RNA binding channel on the positive face of the protein. Because U8 snoRNP is essential for accumulation of mature 5.8S and 28S rRNA in vertebrate ribosome biogenesis, and cap structures are required for U8 stability in vivo, X29 could profoundly influence this fundamental cellular pathway. | ||
==About this Structure== | ==About this Structure== | ||
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[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Xenopus laevis]] | [[Category: Xenopus laevis]] | ||
[[Category: Peculis, B | [[Category: Peculis, B A.]] | ||
[[Category: Scarsdale, J | [[Category: Scarsdale, J N.]] | ||
[[Category: Wright, H | [[Category: Wright, H T.]] | ||
[[Category: MN]] | [[Category: MN]] | ||
[[Category: POP]] | [[Category: POP]] | ||
[[Category: modified nudix hydrolase fold]] | [[Category: modified nudix hydrolase fold]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:24:42 2008'' | ||
Revision as of 17:24, 21 February 2008
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2.6 Angstrom Crystal Structure of the Complex Between the Nuclear SnoRNA Decapping Nudix Hydrolase X29 and Manganese in the Presence of 7-methyl-GDP
OverviewOverview
X29, a 25 kDa Nudix hydrolase from Xenopus laevis that cleaves 5' caps from U8 snoRNA, crystallizes as a homodimeric apoenzyme. Manganese binds crystals of apo-X29 to form holo-X29 only in the presence of nucleot(s)ide. Structural changes in X29 on nucleo-t(s)ide-assisted Mn(+2) uptake account for the observed cooperativity of metal binding. Structures of X29 with GTP or m7GpppA show a different mode of ligand binding from that of other cap binding proteins and suggest a possible three- or four-metal Nudix reaction mechanism. The X29 dimer has no known RNA binding motif, but its striking surface dipolarity and unique structural features create a plausible RNA binding channel on the positive face of the protein. Because U8 snoRNP is essential for accumulation of mature 5.8S and 28S rRNA in vertebrate ribosome biogenesis, and cap structures are required for U8 stability in vivo, X29 could profoundly influence this fundamental cellular pathway.
About this StructureAbout this Structure
2A8Q is a Single protein structure of sequence from Xenopus laevis with and as ligands. Full crystallographic information is available from OCA.
ReferenceReference
Crystal structures of U8 snoRNA decapping nudix hydrolase, X29, and its metal and cap complexes., Scarsdale JN, Peculis BA, Wright HT, Structure. 2006 Feb;14(2):331-43. PMID:16472752
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