6c0f | pdb_00006c0f

Yeast nucleolar pre-60S ribosomal subunit (state 2)

Loading... Status: waiting for Mol* initialization Structural highlights 6c0f is a 43 chain structure with sequence from Saccharomyces cerevisiae by4741. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ZN NonStd Res: UNK Activity: RNA helicase, with EC number 3.6.4.13 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [PESC_YEAST] Component of the NOP7 complex, which is required for maturation of the 25S and 5.8S ribosomal RNAs and formation of the 60S ribosome.[HAMAP-Rule:MF_03028] [NOG1_YEAST] Involved in the biogenesis of the 60S ribosomal subunit. [MAK16_YEAST] Its role might be as part of the apparatus concerned with the nuclear events of the cell cycle. [RL37A_YEAST] Binds to the 23S rRNA (By similarity). [SSF1_YEAST] Required for biogenesis of the 60S ribosomal subunit. [RRP14_YEAST] Involved in ribosome biogenesis and cell polarity. Required for the synthesis of both 40S and 60S ribosomal subunits and may also play some direct role in correct positioning of the mitotic spindle during mitosis. [HAS1_YEAST] ATP-dependent RNA helicase involved in 40S ribosomal subunit biogenesis. Required for the processing and cleavage of 35S pre-rRNA at sites A0, A1, and A2, leading to mature 18S rRNA. [RPF1_YEAST] Essential protein. Required for biogenesis of the 60S ribosomal subunit. [IF6_YEAST] Binds to the 60S ribosomal subunit and prevents its association with the 40S ribosomal subunit to form the 80S initiation complex in the cytoplasm. Is also involved in ribosome biogenesis. Associates with pre-60S subunits in the nucleus and is involved in its nuclear export. Cytoplasmic release of TIF6 from 60S subunits and nuclear relocalization is promoted by the GTPase RIA1/EFL1 and by SDO1. Also required for pre-rRNA processing. [NOP16_YEAST] Involved in the biogenesis of the 60S ribosomal subunit. [RL4A_YEAST] Participates in the regulation of the accumulation of its own mRNA. [RLP24_YEAST] Involved in the biogenesis of the 60S ribosomal subunit. Ensures the docking of NOG1 to pre-60S particles. [RRP15_YEAST] Constituent of pre-60S ribosomal particles. Required for large subunit rRNA maturation, in particular processing of the 27S pre-rRNA at the A3 and B1 sites to yield 5.8S and 25S rRNA. [CIC1_YEAST] An adapter protein that specifically links the 26S proteasome to its substrate CDC4 which is one of the substrate recognition subunits of the SCF E3 ubiquitin ligase complex. Required for turnover of cell cycle regulatory proteins CDC4 and GRR1. Required for synthesis and nuclear export of 60S ribosomal subunits. Required for vegetative growth. [RLP7_YEAST] Involved in the biogenesis of the 60S ribosomal subunit. May act as a specificity factor that binds precursor rRNAs and tethers the enzymes that carry out the early 5' to 3' exonucleolytic reactions that generate the mature rRNAs. [NSA1_YEAST] Involved in the biogenesis of the 60S ribosomal subunit. [NOP15_YEAST] Involved in the biogenesis of the 60S ribosomal subunit. Required for pre-rRNA processing and cytokinesis. Associates with the precursors of the 25S and 5.8S rRNAs. [RRP1_YEAST] Required for 27S rRNA processing to 25S and 5.8S. Publication Abstract from PubMed Early co-transcriptional events of eukaryotic ribosome assembly result in the formation of precursors of the small (40S) and large (60S) ribosomal subunits(1). A multitude of transient assembly factors regulate and chaperone the systematic folding of pre-ribosomal RNA subdomains. However, due to limited structural information, the role of these factors during early nucleolar 60S assembly is not fully understood. Here we have determined cryo-EM reconstructions of the nucleolar pre-60S ribosomal subunit in different conformational states at resolutions up to 3.4 A. These reconstructions reveal how steric hindrance and molecular mimicry are used to prevent both premature folding states and binding of later factors. This is accomplished by the concerted activity of 21 ribosome assembly factors that stabilize and remodel pre-ribosomal RNA and ribosomal proteins. Among these factors, three Brix-domain proteins and their binding partners form a ring-like structure at rRNA domain boundaries to support the architecture of the maturing particle. Mutually exclusive conformations of these pre-60S particles suggest that the formation of the polypeptide exit tunnel is achieved through different folding pathways during subsequent stages of ribosome assembly. These structures rationalize previous genetic and biochemical data and highlight the mechanisms driving eukaryotic ribosome assembly in a unidirectional manner. Modular assembly of the nucleolar pre-60S ribosomal subunit.,Sanghai ZA, Miller L, Molloy KR, Barandun J, Hunziker M, Chaker-Margot M, Wang J, Chait BT, Klinge S Nature. 2018 Mar 5. pii: nature26156. doi: 10.1038/nature26156. PMID:29512650 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Eukaryotic initiation factor 3D structures Ribosome 3D structures Ribosome biogenesis protein

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