ISDA

Deposition Date 2023-07-17

Release Date 2023-11-15

Last Version Date 2023-12-20

Entry Detail

PDB ID:

8PV6

Keywords:

RIBOSOME

Title:

Chaetomium thermophilum pre-60S State 3 - post-5S rotation with Rix1 complex with Foot - composite structure

Biological Source:

Source Organism:

Thermochaetoides thermophila DSM 1495 (Taxon ID: 759272)

Host Organism:

Thermochaetoides thermophila DSM 1495

Method Details:

Experimental Method:

ELECTRON MICROSCOPY

Resolution:

2.94 Å

Aggregation State:

PARTICLE

Reconstruction Method:

SINGLE PARTICLE

Download Validation Report

Macromolecular Entities

Polymer Type:polyribonucleotide
Molecule:26S rRNA
Chain IDs:A (auth: C1)
Chain Length:3342
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

Polymer Type:polyribonucleotide
Molecule:5.8S rRNA
Chain IDs:B (auth: C2)
Chain Length:156
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

Polymer Type:polyribonucleotide
Molecule:ITS2
Chain IDs:C (auth: C3)
Chain Length:162
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

Polymer Type:polyribonucleotide
Molecule:5S rRNA
Chain IDs:D (auth: C4)
Chain Length:119
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Large ribosomal subunit protein uL10
Gene (Uniprot):CTHT_0025680
Chain IDs:E (auth: CF)
Chain Length:270
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S616 Pfam ID:PF00466, PF17777

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Nucleolar GTP-binding protein 1
Gene (Uniprot):NOG1
Chain IDs:F (auth: CH)
Chain Length:517
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S8F1 Pfam ID:PF17835, PF06858, PF08155

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Putative RNA-binding protein
Gene (Uniprot):CTHT_0013570
Chain IDs:G (auth: CI)
Chain Length:414
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S1H0 Pfam ID:PF00076

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Pescadillo homolog
Gene (Uniprot):NOP7
Chain IDs:H (auth: CJ)
Chain Length:679
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SHX6 Pfam ID:PF06732, PF00533

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Ribosome biogenesis protein NSA2 homolog
Gene (Uniprot):CTHT_0009080
Chain IDs:I (auth: CK)
Chain Length:261
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S081 Pfam ID:PF01201

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Putative GTP binding protein
Gene (Uniprot):CTHT_0059920
Chain IDs:J (auth: CL)
Chain Length:558
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SEW3 Pfam ID:PF08701, PF01926

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein l7-like protein
Gene (Uniprot):CTHT_0071220
Chain IDs:K (auth: CM), EA (auth: LF)
Chain Length:249
Number of Molecules:2
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SFL0 Pfam ID:PF08079, PF00327

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Eukaryotic translation initiation factor 6
Gene (Uniprot):TIF6
Chain IDs:L (auth: CN)
Chain Length:246
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S683 Pfam ID:PF01912

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:DUF2423 domain-containing protein
Gene (Uniprot):CTHT_0070290
Chain IDs:M (auth: CO)
Chain Length:120
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SHK0 Pfam ID:PF10338

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Ribosome biogenesis protein RLP24
Gene (Uniprot):CTHT_0039400
Chain IDs:N (auth: CQ)
Chain Length:225
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S497 Pfam ID:PF01246

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Protein SDA1
Gene (Uniprot):SDA1
Chain IDs:O (auth: CR)
Chain Length:767
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S215 Pfam ID:PF08158, PF05285, PF21638

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Pre-rRNA-processing protein IPI1
Gene (Uniprot):IPI1
Chain IDs:P (auth: CS)
Chain Length:338
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:P0CT45 Pfam ID:PF12333

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Pre-rRNA-processing protein IPI3
Gene (Uniprot):CTHT_0014750
Chain IDs:Q (auth: CT), R (auth: CU)
Chain Length:437
Number of Molecules:2
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S1T5 Pfam ID:PF00400

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Pre-rRNA-processing protein RIX1
Gene (Uniprot):CTHT_0025150
Chain IDs:S (auth: CV), T (auth: CW)
Chain Length:781
Number of Molecules:2
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S5R0 Pfam ID:PF08167

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Zinc finger domain-containing protein
Gene (Uniprot):CTHT_0048710
Chain IDs:U (auth: Cb)
Chain Length:117
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SB32 Pfam ID:PF12171

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Nucleolar GTP-binding protein 2
Gene (Uniprot):CTHT_0055100
Chain IDs:V (auth: Cd)
Chain Length:627
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SBX1 Pfam ID:PF08153, PF01926

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Ribosome biogenesis protein NOP53
Gene (Uniprot):CTHT_0039380
Chain IDs:W (auth: Ce)
Chain Length:443
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S495 Pfam ID:PF07767

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Ribosome assembly protein 4
Gene (Uniprot):CTHT_0055700
Mutagens:E117D
Chain IDs:X (auth: Ch)
Chain Length:517
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SC29 Pfam ID:PF00400

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:rRNA-processing protein
Gene (Uniprot):CTHT_0057940
Chain IDs:Y (auth: Cz)
Chain Length:123
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SCP3 Pfam ID:PF03879

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L2-like protein
Gene (Uniprot):CTHT_0023090
Chain IDs:Z (auth: LA)
Chain Length:149
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S4P8 Pfam ID:PF00181, PF03947

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L3-like protein
Gene (Uniprot):CTHT_0004490
Chain IDs:AA (auth: LB)
Chain Length:65
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0RXW1 Pfam ID:PF00297

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L4-like protein
Gene (Uniprot):CTHT_0061540
Chain IDs:BA (auth: LC)
Chain Length:365
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SFC3 Pfam ID:PF00573, PF14374

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein l5-like protein
Gene (Uniprot):HT_0063640
Chain IDs:CA (auth: LD)
Chain Length:304
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SEG2 Pfam ID:PF17144, PF14204

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L6
Gene (Uniprot):CTHT_0009640
Chain IDs:DA (auth: LE)
Chain Length:131
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S0D6 Pfam ID:PF01159

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L8
Gene (Uniprot):CTHT_0042550
Chain IDs:FA (auth: LG)
Chain Length:119
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SAJ9 Pfam ID:PF01248

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein l9-like protein
Chain IDs:GA (auth: LH)
Chain Length:935
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Putative ribosomal protein
Gene (Uniprot):HT_0072970
Chain IDs:HA (auth: LJ)
Chain Length:173
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SHQ2 Pfam ID:PF00281, PF00673

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L12-like protein
Gene (Uniprot):CTHT_0066380
Chain IDs:IA (auth: LK)
Chain Length:94
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SGH8 Pfam ID:PF03946, PF00298

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L13
Gene (Uniprot):CTHT_0045000
Chain IDs:JA (auth: LL)
Chain Length:51
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S992 Pfam ID:PF01294

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L14-like protein
Gene (Uniprot):CTHT_0014490
Chain IDs:KA (auth: LM)
Chain Length:142
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S1R0 Pfam ID:PF01929

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Ribosomal protein L15
Gene (Uniprot):CTHT_0002100
Chain IDs:LA (auth: LN)
Chain Length:203
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0RZ88 Pfam ID:PF00827

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L16-like protein
Gene (Uniprot):CTHT_0068840
Chain IDs:MA (auth: LO)
Chain Length:204
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SH61 Pfam ID:PF00572

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein l17-like protein
Gene (Uniprot):CTHT_0067970
Chain IDs:NA (auth: LP)
Chain Length:92
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SGY1 Pfam ID:PF00237

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Ribosomal protein L18-like protein
Gene (Uniprot):CTHT_0045230
Chain IDs:OA (auth: LQ)
Chain Length:213
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S9B5 Pfam ID:PF17135

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Ribosomal protein L19
Gene (Uniprot):CTHT_0047080
Chain IDs:PA (auth: LR)
Chain Length:217
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S9T3 Pfam ID:PF12074, PF13513, PF21040, PF10274, PF01280

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L20
Gene (Uniprot):CTHT_0056900
Chain IDs:QA (auth: LS)
Chain Length:174
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SCE2 Pfam ID:PF01775

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein l21-like protein
Gene (Uniprot):CTHT_0011760
Chain IDs:RA (auth: LT)
Chain Length:160
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S0Z3 Pfam ID:PF01157

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L22-like protein
Gene (Uniprot):CTHT_0052850
Chain IDs:SA (auth: LU)
Chain Length:127
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SDS8 Pfam ID:PF01776

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein l23-like protein
Gene (Uniprot):CTHT_0074440
Chain IDs:TA (auth: LV)
Chain Length:139
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SI44 Pfam ID:PF00238

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L25-like protein
Gene (Uniprot):CTHT_0023650
Chain IDs:UA (auth: LX)
Chain Length:156
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S507 Pfam ID:PF03939, PF00276

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L26-like protein
Gene (Uniprot):CTHT_0007360
Chain IDs:VA (auth: LY)
Chain Length:138
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0RYN9 Pfam ID:PF16906, PF00467

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L27
Gene (Uniprot):CTHT_0002720
Chain IDs:WA (auth: LZ)
Chain Length:135
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0RZE9 Pfam ID:PF01777

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L28-like protein
Chain IDs:XA (auth: La)
Chain Length:149
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L29
Gene (Uniprot):CHGG_02990
Chain IDs:YA (auth: Lb)
Chain Length:65
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:Q2H9W4 Pfam ID:PF01779

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein l30-like protein
Gene (Uniprot):CTHT_0063820
Chain IDs:ZA (auth: Lc)
Chain Length:365
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SEI0 Pfam ID:PF01248

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Putative 60S ribosomal protein
Gene (Uniprot):CTHT_0059140
Chain IDs:AB (auth: Ld)
Chain Length:304
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SD68 Pfam ID:PF01198

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L32-like protein
Gene (Uniprot):CTHT_0027000
Chain IDs:BB (auth: Le)
Chain Length:131
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S6V4 Pfam ID:PF01655

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein l33-like protein
Gene (Uniprot):CTHT_0057640
Chain IDs:CB (auth: Lf)
Chain Length:249
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SCL3 Pfam ID:PF01247

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Ribosomal protein l34-like protein
Gene (Uniprot):CTHT_0071430
Chain IDs:DB (auth: Lg)
Chain Length:119
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SFN0 Pfam ID:PF01199

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:dolichyl-diphosphooligosaccharide--protein glycotransferase
Gene (Uniprot):CTHT_0009650
Chain IDs:EB (auth: Lh)
Chain Length:935
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S0D7 Pfam ID:PF00831, PF02516, PF21436

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L36
Gene (Uniprot):CTHT_0054170
Chain IDs:FB (auth: Li)
Chain Length:110
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SBN1 Pfam ID:PF01158

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Ribosomal protein L37
Gene (Uniprot):CTHT_0011850
Chain IDs:GB (auth: Lj)
Chain Length:173
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S101 Pfam ID:PF01907

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L38-like protein
Gene (Uniprot):CTHT_0065470
Chain IDs:HB (auth: Lk)
Chain Length:94
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SG89 Pfam ID:PF01781

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Ribosomal protein eL39
Gene (Uniprot):CHGG_03042
Chain IDs:IB (auth: Ll)
Chain Length:51
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:Q2H9R2 Pfam ID:PF00832

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:60S ribosomal protein L43-like protein
Gene (Uniprot):CTHT_0026110
Chain IDs:JB (auth: Lp)
Chain Length:92
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S6B0 Pfam ID:PF01780

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Putative 60S ribosomal protein
Gene (Uniprot):CTHT_0070250
Chain IDs:KB (auth: Lq)
Chain Length:213
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0SHJ6 Pfam ID:PF01778

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Ribosomal protein
Gene (Uniprot):CTHT_0023560
Chain IDs:LB (auth: Lr)
Chain Length:217
Number of Molecules:1
Biological Source:Thermochaetoides thermophila DSM 1495

UniProt ID:G0S4Z9 Pfam ID:PF00687

Ligand Molecules

GTP

Primary Citation

Structural insights into coordinating 5S RNP rotation with ITS2 pre-RNA processing during ribosome formation.

Thoms, M, Lau, B, Cheng, J, Fromm, L, Denk, T, Kellner, N, Flemming, D, Fischer, P, Falquet, L, Berninghausen, O, Beckmann, R, Hurt, E.Show

Embo Rep. 24 e57984 e57984 (2023)

PMID: 37921038 DOI: 10.15252/embr.202357984

Abstact

The rixosome defined in Schizosaccharomyces pombe and humans performs diverse roles in pre-ribosomal RNA processing and gene silencing. Here, we isolate and describe the conserved rixosome from Chaetomium thermophilum, which consists of two sub-modules, the sphere-like Rix1-Ipi3-Ipi1 and the butterfly-like Las1-Grc3 complex, connected by a flexible linker. The Rix1 complex of the rixosome utilizes Sda1 as landing platform on nucleoplasmic pre-60S particles to wedge between the 5S rRNA tip and L1-stalk, thereby facilitating the 180° rotation of the immature 5S RNP towards its mature conformation. Upon rixosome positioning, the other sub-module with Las1 endonuclease and Grc3 polynucleotide-kinase can reach a strategic position at the pre-60S foot to cleave and 5' phosphorylate the nearby ITS2 pre-rRNA. Finally, inward movement of the L1 stalk permits the flexible Nop53 N-terminus with its AIM motif to become positioned at the base of the L1-stalk to facilitate Mtr4 helicase-exosome participation for completing ITS2 removal. Thus, the rixosome structure elucidates the coordination of two central ribosome biogenesis events, but its role in gene silencing may adapt similar strategies.

Legend

Protein

Chemical

Disease

Primary Citation of related structures