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5lqw
From Proteopedia
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==yeast activated spliceosome== | ==yeast activated spliceosome== | ||
| - | < | + | <SX load='5lqw' size='340' side='right' viewer='molstar' caption='[[5lqw]], [[Resolution|resolution]] 5.80Å' scene=''> |
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[5lqw]] is a 31 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_18824 Atcc 18824] and [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5LQW OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5LQW FirstGlance]. <br> | <table><tr><td colspan='2'>[[5lqw]] is a 31 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_18824 Atcc 18824] and [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5LQW OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5LQW FirstGlance]. <br> | ||
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==See Also== | ==See Also== | ||
| - | *[[Pre-mRNA | + | *[[Pre-mRNA splicing factors 3D structures|Pre-mRNA splicing factors 3D structures]] |
== References == | == References == | ||
<references/> | <references/> | ||
__TOC__ | __TOC__ | ||
| - | </ | + | </SX> |
[[Category: Atcc 18824]] | [[Category: Atcc 18824]] | ||
| + | [[Category: Large Structures]] | ||
[[Category: RNA helicase]] | [[Category: RNA helicase]] | ||
[[Category: Saccharomyces cerevisiae]] | [[Category: Saccharomyces cerevisiae]] | ||
Revision as of 19:00, 6 March 2020
yeast activated spliceosome
Structural highlights
Function[PRP45_YEAST] Involved in pre-mRNA splicing. Associated with the spliceosome throughout the splicing reactions, until after the second catalytic step.[1] [2] [RSMB_YEAST] Involved in pre-mRNA splicing. Binds snRNA U1, U2, U4 and U5 which contain a highly conserved structural motif called the Sm binding site. [CWC22_YEAST] May be involved in pre-mRNA splicing. [SMD1_YEAST] Involved in pre-mRNA splicing. Binds snRNA U1, U2, U4 and U5 which contain a highly conserved structural motif called the Sm binding site. Also binds telomerase RNA and is required for its accumulation.[3] [4] [CEF1_YEAST] Involved in pre-mRNA splicing and cell cycle control. Required for the binding of the NTC complex (or PRP19-associated complex) components to the spliceosome to mediate conformational rearrangement or to stabilize the structure of the spliceosome after U4 snRNA dissociation, which leads to spliceosome maturation. Its absence leads to an arrest of the cell cycle, possibly due to the inefficient splicing of TUB1.[5] [6] [7] [8] [SN114_YEAST] Component of the U5 snRNP complex required for pre-mRNA splicing. Binds GTP. [SMD3_YEAST] Involved in pre-mRNA splicing. Binds snRNA U1, U2, U4 and U5 which contain a highly conserved structural motif called the Sm binding site. Also binds telomerase RNA and is required for its accumulation.[9] [10] [PRP8_YEAST] Required for pre-spliceosome formation, which is the first step of pre-mRNA splicing. This protein is associated with snRNP U5. Has a role in branch site-3' splice site selection. Associates with the branch site-3' splice 3'-exon region. Also has a role in cell cycle.[11] [12] [13] [14] [RSE1_YEAST] Involved in G2/M transition (By similarity). Required for pre-mRNA splicing and endoplasmic reticulum (ER) to Golgi secretion pathway. U2 snRNPs associated protein required for the pre-spliceosome assembly. The involvement in ER to Golgi secretion is probably indirect and due to the splicing of the pre-mRNA coding for SAR1, a small GTP-binding protein required for COPII vesicle formation from the ER.[15] [16] [RUXE_YEAST] Involved in pre-mRNA splicing. Binds and is required for the stability of snRNA U1, U2, U4 and U5 which contain a highly conserved structural motif called the Sm binding site. Involved in cap modification.[17] [CLF1_YEAST] Involved in pre-mRNA splicing and cell cycle progression. Required for the spliceosome assembly by promoting the functional integration of the U4/U6.U5 tri-snRNP particle into the U1-, U2-dependent pre-spliceosome. Also recruits PRP19 to the spliceosome, as a component of the NTC complex (or PRP19-associated complex). The association of the NTC complex to the spliceosome mediates conformational rearrangement or stabilizes the structure of the spliceosome after U4 snRNA dissociation, which leads to spliceosome maturation. Required for initiation of the DNA replication by binding the RNA replication origins, probably through its interaction with the origin recognition complex (ORC).[18] [19] [20] [21] [22] [PRP2_YEAST] Involved in pre-mRNA splicing. Is required together with ATP and at least one other factor, for the first cleavage-ligation reaction. Functions as a molecular motor in the activation of the precatalytic spliceosome for the first transesterification reaction of pre-mRNA splicing by hydrolyzing ATP to cause the activation of the spliceosome without the occurrence of splicing. Capable of hydrolyzing nucleoside triphosphates in the presence of single-stranded RNAs such as poly(U).[23] [24] [25] [26] [27] [SMD2_YEAST] Involved in pre-mRNA splicing. Binds snRNA U1, U2, U4 and U5 which contain a highly conserved structural motif called the Sm binding site. [RUXG_YEAST] Involved in pre-mRNA splicing. Binds snRNA U1, U2, U4 and U5 which contain a highly conserved structural motif called the Sm binding site. [CWC2_YEAST] Involved in the first step of pre-mRNA splicing. Required for cell growth and cell cycle control. Plays a role in the levels of the U1, U4, U5 and U6 snRNAs and the maintenance of the U4/U6 snRNA complex. May provide the link between the "nineteen complex" NTC spliceosome protein complex and the spliceosome through the U6 snRNA. Associates predominantly with U6 snRNAs in assembled active spliceosomes. Binds directly to the internal stem-loop (ISL) domain of the U6 snRNA and to the pre-mRNA intron near the 5' splice site during the activation and catalytic phases of the spliceosome cycle. Binds also to U1, U4, U5 and U6 snRNAs and to pre-mRNAs, in vitro. Is not required for the Prp2-mediated remodeling of the activated spliceosome.[28] [29] [BRR2_YEAST] RNA helicase that plays an essential role in pre-mRNA splicing as component of the U5 snRNP and U4/U6-U5 tri-snRNP complexes. Involved in spliceosome assembly, activation and disassembly. Mediates changes in the dynamic network of RNA-RNA interactions in the spliceosome. Catalyzes the ATP-dependent unwinding of U4/U6 RNA duplices, an essential step in the assembly of a catalytically active spliceosome.[30] [31] [32] [33] [PRP46_YEAST] Involved in pre-mRNA splicing. May also be required for cell cycle progression at G2/M (By similarity).[34] [PML1_YEAST] Required for efficient splicing and pre-mRNA nuclear retention.[35] [YSF3_YEAST] Involved in pre-mRNA splicing. Required for the SF3b integrity and prespliceosome assembly.[36] [SYF1_YEAST] Involved in pre-mRNA splicing and cell cycle control. As a component of the NTC complex (or PRP19-associated complex), associates to the spliceosome to mediate conformational rearrangement or to stabilize the structure of the spliceosome after U4 snRNA dissociation, which leads to spliceosome maturation.[37] [38] [SF3B1_YEAST] Contacts pre-mRNA on both sides of the branch site early in spliceosome assembly. [IST3_YEAST] Required for pre-mRNA splicing and spliceosome assembly. As part of the pre-mRNA retention and splicing (RES) complex, required for nuclear pre-mRNA retention and efficient splicing. Required for MER1-activated splicing.[39] [40] [41] [SLT11_YEAST] Involved in pre-mRNA splicing. Facilitates the cooperative formation of U2/U6 helix II in association with stem II in the spliceosome. Binds to RNA.[42] [43] [RUXF_YEAST] Involved in pre-mRNA splicing. Binds snRNA U1, U2, U4 and U5 which contain a highly conserved structural motif called the Sm binding site. [RDS3_YEAST] Required for pre-mRNA splicing. Involved in regulation of drug sensitivity and may play a role in multidrug resistance.[44] [45] [CWC26_YEAST] Required for efficient splicing and pre-mRNA nuclear retention. May also be involved in positioning the proximal bud pole signal.[46] [47] [48] [49] [BUD31_YEAST] Involved in pre-mRNA splicing. Important for bud site selection. Publication Abstract from PubMedThe activated spliceosome (Bact) is in a catalytically inactive state and is remodeled into a catalytically active machine by the RNA helicase Prp2, but the mechanism is unclear. Here we describe a 3D electron cryomicroscopy structure of the S. cerevisiae Bact complex at 5.8 A resolution. Our model reveals that in Bact the catalytic U2/U6 RNA-Prp8 ribonucleoprotein core is already established, and the 5' splice site (ss) is oriented for step 1 catalysis but occluded by protein. The first step nucleophile - the branchsite adenosine - is sequestered within the Hsh155 HEAT domain and is held 50 A away from the 5'ss. Our structure suggests that Prp2 ATPase-mediated remodeling leads to conformational changes in Hsh155's HEAT domain that liberate the first step reactants for catalysis. Molecular architecture of the Saccharomyces cerevisiae activated spliceosome.,Rauhut R, Fabrizio P, Dybkov O, Hartmuth K, Pena V, Chari A, Kumar V, Lee CT, Urlaub H, Kastner B, Stark H, Luhrmann R Science. 2016 Aug 25. pii: aag1906. PMID:27562955[50] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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