3bw1

From Proteopedia

(Difference between revisions)

Revision as of 22:41, 25 December 2014

Crystal structure of homomeric yeast Lsm3 exhibiting novel octameric ring organisation

Structural highlights

3bw1 is a 2 chain structure with sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
Related:	1i81, 1d3b, 1b34, 1n9s, 1n9r
Gene:	SMX4 (Saccharomyces cerevisiae)
Resources:	FirstGlance, OCA, RCSB, PDBsum

Function

[LSM3_YEAST] Component of LSm protein complexes, which are involved in RNA processing and may function in a chaperone-like manner. Component of the cytoplasmic LSM1-LSM7 complex which is thought to be involved in mRNA degradation by activating the decapping step. Component of the nuclear LSM2-LSM8 complex, which is involved in splicing of nuclear mRNAs. LSM2-LSM8 associates with multiple snRNP complexes containing the U6 snRNA (U4/U6 snRNP, U4/U6.U5 snRNP, and free U6 snRNP). It binds directly to the U6 snRNA and plays a role in the biogenesis and stability of the U6 snRNP and U4/U6 snRNP complexes. It probably also is involved degradation of nuclear pre-mRNA by targeting them for decapping. LSM3 binds specifically to the 3'-terminal U-tract of U6 snRNA. LSM2-LSM8 probably is involved in processing of pre-tRNAs, pre-rRNAs and U3 snoRNA. LSM3, probably in a complex that contains LSM2-LSM7 but not LSM1 or LSM8, associates with the precursor of the RNA component of RNase P (pre-P RNA) and may be involved in maturing pre-P RNA. LSM3 is required for processing of pre-tRNAs, pre-rRNAs and U3 snoRNA.^[1] ^[2] ^[3] ^[4] ^[5] ^[6]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Sm and Sm-like (Lsm) proteins are core components of the ribonucleoprotein complexes essential to key nucleic acid processing events within the eukaryotic cell. They assemble as polyprotein ring scaffolds that have the capacity to bind RNA substrates and other necessary protein factors. The crystal structure of yeast Lsm3 reveals a new organisation of the L/Sm beta-propeller ring, containing eight protein subunits. Little distortion of the characteristic L/Sm fold is required to form the octamer, indicating that the eukaryotic Lsm ring may be more pliable than previously thought. The homomeric Lsm3 octamer is found to successfully recruit Lsm6, Lsm2 and Lsm5 directly from yeast lysate. Our crystal structure shows the C-terminal tail of each Lsm3 subunit to be engaged in connections across rings through specific beta-sheet interactions with elongated loops protruding from neighbouring octamers. While these loops are of distinct length for each Lsm protein and generally comprise low-complexity polar sequences, several Lsm C-termini comprise hydrophobic sequences suitable for beta-sheet interactions. The Lsm3 structure thus provides evidence for protein-protein interactions likely utilised by the highly variable Lsm loops and termini in the recruitment of RNA processing factors to mixed Lsm ring scaffolds. Our coordinates also provide updated homology models for the active Lsm[1-7] and Lsm[2-8] heptameric rings.

Crystal structure of Lsm3 octamer from Saccharomyces cerevisiae: implications for Lsm ring organisation and recruitment.,Naidoo N, Harrop SJ, Sobti M, Haynes PA, Szymczyna BR, Williamson JR, Curmi PM, Mabbutt BC J Mol Biol. 2008 Apr 11;377(5):1357-71. Epub 2008 Jan 11. PMID:18329667^[7]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Seraphin B. Sm and Sm-like proteins belong to a large family: identification of proteins of the U6 as well as the U1, U2, U4 and U5 snRNPs. EMBO J. 1995 May 1;14(9):2089-98. PMID:7744014
↑ Bouveret E, Rigaut G, Shevchenko A, Wilm M, Seraphin B. A Sm-like protein complex that participates in mRNA degradation. EMBO J. 2000 Apr 3;19(7):1661-71. PMID:10747033 doi:10.1093/emboj/19.7.1661
↑ Tharun S, He W, Mayes AE, Lennertz P, Beggs JD, Parker R. Yeast Sm-like proteins function in mRNA decapping and decay. Nature. 2000 Mar 30;404(6777):515-8. PMID:10761922 doi:10.1038/35006676
↑ Kufel J, Allmang C, Verdone L, Beggs JD, Tollervey D. Lsm proteins are required for normal processing of pre-tRNAs and their efficient association with La-homologous protein Lhp1p. Mol Cell Biol. 2002 Jul;22(14):5248-56. PMID:12077351
↑ Kufel J, Allmang C, Petfalski E, Beggs J, Tollervey D. Lsm Proteins are required for normal processing and stability of ribosomal RNAs. J Biol Chem. 2003 Jan 24;278(4):2147-56. Epub 2002 Nov 15. PMID:12438310 doi:http://dx.doi.org/10.1074/jbc.M208856200
↑ Kufel J, Bousquet-Antonelli C, Beggs JD, Tollervey D. Nuclear pre-mRNA decapping and 5' degradation in yeast require the Lsm2-8p complex. Mol Cell Biol. 2004 Nov;24(21):9646-57. PMID:15485930 doi:http://dx.doi.org/10.1128/MCB.24.21.9646-9657.2004
↑ Naidoo N, Harrop SJ, Sobti M, Haynes PA, Szymczyna BR, Williamson JR, Curmi PM, Mabbutt BC. Crystal structure of Lsm3 octamer from Saccharomyces cerevisiae: implications for Lsm ring organisation and recruitment. J Mol Biol. 2008 Apr 11;377(5):1357-71. Epub 2008 Jan 11. PMID:18329667 doi:10.1016/j.jmb.2008.01.007

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/3bw1"

@@ Line 3: / Line 3: @@
 == Structural highlights ==
 <table><tr><td colspan='2'>[[3bw1]] is a 2 chain structure with 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=3BW1 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3BW1 FirstGlance]. <br>
-</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MPD:(4S)-2-METHYL-2,4-PENTANEDIOL'>MPD</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene><br>
+</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MPD:(4S)-2-METHYL-2,4-PENTANEDIOL'>MPD</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
-<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1i81|1i81]], [[1d3b|1d3b]], [[1b34|1b34]], [[1n9s|1n9s]], [[1n9r|1n9r]]</td></tr>
+<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1i81|1i81]], [[1d3b|1d3b]], [[1b34|1b34]], [[1n9s|1n9s]], [[1n9r|1n9r]]</td></tr>
-<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">SMX4 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=4932 Saccharomyces cerevisiae])</td></tr>
+<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">SMX4 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=4932 Saccharomyces cerevisiae])</td></tr>
-<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3bw1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3bw1 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3bw1 RCSB], [http://www.ebi.ac.uk/pdbsum/3bw1 PDBsum]</span></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=3bw1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3bw1 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3bw1 RCSB], [http://www.ebi.ac.uk/pdbsum/3bw1 PDBsum]</span></td></tr>
-<table>
+</table>
+== Function ==
+[[http://www.uniprot.org/uniprot/LSM3_YEAST LSM3_YEAST]] Component of LSm protein complexes, which are involved in RNA processing and may function in a chaperone-like manner. Component of the cytoplasmic LSM1-LSM7 complex which is thought to be involved in mRNA degradation by activating the decapping step. Component of the nuclear LSM2-LSM8 complex, which is involved in splicing of nuclear mRNAs. LSM2-LSM8 associates with multiple snRNP complexes containing the U6 snRNA (U4/U6 snRNP, U4/U6.U5 snRNP, and free U6 snRNP). It binds directly to the U6 snRNA and plays a role in the biogenesis and stability of the U6 snRNP and U4/U6 snRNP complexes. It probably also is involved degradation of nuclear pre-mRNA by targeting them for decapping. LSM3 binds specifically to the 3'-terminal U-tract of U6 snRNA. LSM2-LSM8 probably is involved in processing of pre-tRNAs, pre-rRNAs and U3 snoRNA. LSM3, probably in a complex that contains LSM2-LSM7 but not LSM1 or LSM8, associates with the precursor of the RNA component of RNase P (pre-P RNA) and may be involved in maturing pre-P RNA. LSM3 is required for processing of pre-tRNAs, pre-rRNAs and U3 snoRNA.<ref>PMID:7744014</ref> <ref>PMID:10747033</ref> <ref>PMID:10761922</ref> <ref>PMID:12077351</ref> <ref>PMID:12438310</ref> <ref>PMID:15485930</ref>
 == Evolutionary Conservation ==
 [[Image:Consurf_key_small.gif|200px|right]]
@@ Line 34: / Line 36: @@
 </StructureSection>
 [[Category: Saccharomyces cerevisiae]]
-[[Category: Curmi, P M.G.]]
+[[Category: Curmi, P M.G]]
-[[Category: Harrop, S J.]]
+[[Category: Harrop, S J]]
-[[Category: Mabbutt, B C.]]
+[[Category: Mabbutt, B C]]
-[[Category: Naidoo, N.]]
+[[Category: Naidoo, N]]
 [[Category: Homomeric]]
 [[Category: Mrna processing]]

3bw1

From Proteopedia

Revision as of 22:41, 25 December 2014

Crystal structure of homomeric yeast Lsm3 exhibiting novel octameric ring organisation

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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