1n87: Difference between revisions
New page: left|200px<br /><applet load="1n87" size="450" color="white" frame="true" align="right" spinBox="true" caption="1n87" /> '''Solution structure of the U-box of Prp19'''<... |
No edit summary |
||
| Line 1: | Line 1: | ||
[[Image:1n87.gif|left|200px]]<br /><applet load="1n87" size=" | [[Image:1n87.gif|left|200px]]<br /><applet load="1n87" size="350" color="white" frame="true" align="right" spinBox="true" | ||
caption="1n87" /> | caption="1n87" /> | ||
'''Solution structure of the U-box of Prp19'''<br /> | '''Solution structure of the U-box of Prp19'''<br /> | ||
==Overview== | ==Overview== | ||
The structure of the U-box in the essential Saccharomyces cerevisiae | The structure of the U-box in the essential Saccharomyces cerevisiae pre-mRNA splicing factor Prp19p has been determined by NMR. The conserved zinc-binding sites supporting the cross-brace arrangement in RING-finger domains are replaced by hydrogen-bonding networks in the U-box. These hydrogen-bonding networks are necessary for the structural stabilization and activity of the U-box. A conservative Val-->Ile point mutation in the Prp19p U-box domain leads to pre-mRNA splicing defects in vivo. NMR analysis of this mutant shows that the substitution disrupts structural integrity of the U-box domain. Furthermore, comparison of the Prp19p U-box domain with known RING-E2 complex structures demonstrates that both U-box and RING-fingers contain a conserved interaction surface. Mutagenesis of residues at this interface, while not perturbing the structure of the U-box, abrogates Prp19p function in vivo. These comparative structural and functional analyses imply that the U-box and its associated ubiquitin ligase activity are critical for Prp19p function in vivo. | ||
==About this Structure== | ==About this Structure== | ||
1N87 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http:// | 1N87 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1N87 OCA]. | ||
==Reference== | ==Reference== | ||
| Line 13: | Line 13: | ||
[[Category: Saccharomyces cerevisiae]] | [[Category: Saccharomyces cerevisiae]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Chazin, W | [[Category: Chazin, W J.]] | ||
[[Category: Kooi, C | [[Category: Kooi, C W.Vander.]] | ||
[[Category: Ohi, M | [[Category: Ohi, M D.]] | ||
[[Category: e3 ligase]] | [[Category: e3 ligase]] | ||
[[Category: u-box]] | [[Category: u-box]] | ||
[[Category: ubiquitin ligase]] | [[Category: ubiquitin ligase]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:03:22 2008'' | ||
Revision as of 15:03, 21 February 2008
|
Solution structure of the U-box of Prp19
OverviewOverview
The structure of the U-box in the essential Saccharomyces cerevisiae pre-mRNA splicing factor Prp19p has been determined by NMR. The conserved zinc-binding sites supporting the cross-brace arrangement in RING-finger domains are replaced by hydrogen-bonding networks in the U-box. These hydrogen-bonding networks are necessary for the structural stabilization and activity of the U-box. A conservative Val-->Ile point mutation in the Prp19p U-box domain leads to pre-mRNA splicing defects in vivo. NMR analysis of this mutant shows that the substitution disrupts structural integrity of the U-box domain. Furthermore, comparison of the Prp19p U-box domain with known RING-E2 complex structures demonstrates that both U-box and RING-fingers contain a conserved interaction surface. Mutagenesis of residues at this interface, while not perturbing the structure of the U-box, abrogates Prp19p function in vivo. These comparative structural and functional analyses imply that the U-box and its associated ubiquitin ligase activity are critical for Prp19p function in vivo.
About this StructureAbout this Structure
1N87 is a Single protein structure of sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.
ReferenceReference
Structural insights into the U-box, a domain associated with multi-ubiquitination., Ohi MD, Vander Kooi CW, Rosenberg JA, Chazin WJ, Gould KL, Nat Struct Biol. 2003 Apr;10(4):250-5. PMID:12627222
Page seeded by OCA on Thu Feb 21 14:03:22 2008