2025-04-30 REL PDBe PDBe PDBe 2024-11-12 2025-04-23 2025-04-23 2025-04-30 German Research Foundation (DFG) EXC 2067/1- 390729940 Germany German Research Foundation (DFG) RI 2715/1- 1 Germany German Research Foundation (DFG) FOR2848 Germany German Research Foundation (DFG) SFB1190 Germany German Research Foundation (DFG) SFB1565 Germany European Research Council (ERC) 101116869 European Union Finke AF Heinrichs M Aibara S Richter-Dennerlein R Hillen HS mitochondrial ribosomal small subunit, translation-initiation intermediate, immature h44, single-particle cryo-EM, RIBOSOME Heinrichs M Finke AF Aibara S Krempler A Boshnakovska A Rehling P Hillen HS Richter-Dennerlein R Nat Commun UK 16 3641 3641 2025 40240327 doi:10.1038/s41467-025-58827-x 2041-1723 Translation-initiation state of human mitochondrial ribosome small subunit (State E) Translation-initiation state of human mitochondrial ribosome small subunit (State E) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

Translation-initiation mtSSU intermediate with immature h44 and in complex with mtIF2 and mtIF3.

Homo sapiens HEK293T 0.99 singleParticle particle 7.4 20.0 Hepes-HCl 100.0 KCl Potassium chloride 20.0 MgCl2 Magnesium chloride 0.02 DDM 1.0 PMSF 1.0 protease-inhibitor mix 0.5 GMP-PNP

20mM HEPES-HCl, 100mM KCl, 20mM MgCl2, 0.02% DDM, 1mM PMSF, 1x protease-inhibitor mix, 0.5mM GMP-PNP

Quantifoil R3.5/1 COPPER CARBON HOLEY CARBON CONTINUOUS GLOW DISCHARGE

The grid was precoated with a 2-3 nm carbon layer.

ETHANE 95 277.15 FEI VITROBOT MARK IV

The sample was crosslinked with 0.15% glutaraldehyde for 10 min on ice. The reaction was stopped by adding 50 mM lysine pH 7.5 and 50 mM aspartate pH 7.5, and subsequently desalted against the final buffer prior to vitrification.

TFS KRIOS OTHER BRIGHT FIELD FIELD EMISSION GUN 300 2.7 0.6 1.6 81000.0 FEI TITAN KRIOS AUTOGRID HOLDER NITROGEN GATAN K3 BIOQUANTUM (6k x 4k) 3.0 40.0 1 5730547

ab initio reconstruction after 2D classification

1 FOURIER SPACE 3.4 FSC 0.143 CUT-OFF cryoSPARC 4.4.1. 18003 MAXIMUM LIKELIHOOD RELION 3.0 MAXIMUM LIKELIHOOD RELION 3.0 3 19332.0 RELION 3.0 7PO1 A PDB experimental model 7PO1 B PDB experimental model 7PO1 C PDB experimental model 7PO1 D PDB experimental model 7PO1 E PDB experimental model 7PO1 F PDB experimental model 7PO1 G PDB experimental model 7PO1 H PDB experimental model 7PO1 I PDB experimental model 7PO1 J PDB experimental model 7PO1 K PDB experimental model 7PO1 L PDB experimental model 7PO1 M PDB experimental model 7PO1 N PDB experimental model 7PO1 O PDB experimental model 7PO1 P PDB experimental model 7PO1 Q PDB experimental model 7PO1 R PDB experimental model 7PO1 S PDB experimental model 7PO1 T PDB experimental model 7PO1 U PDB experimental model 7PO1 V PDB experimental model 7PO1 W PDB experimental model 7PO1 X PDB experimental model 7PO1 Y PDB experimental model 7PO1 Z PDB experimental model 7PO1 0 PDB experimental model 7PO1 1 PDB experimental model 7PO1 2 PDB experimental model 7PO1 3 PDB experimental model 7PO1 4 PDB experimental model 7PO2 7 PDB experimental model 7PO1 8 PDB experimental model RIGID BODY FIT REAL emd_52064_msk_1.map emd_52064_half_map_1.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 440 440 440 0 0 0 440 440 440 461.99997 461.99997 461.99997 90.0 90.0 90.0 X Y Z -3.777468 3.8587697 0.0015722181 0.46264568 1.05 1.05 1.05 AUTHOR ::::EMDATABANK.org::::EMD-52064:::: Half-map 2 of head-focused map of state E emd_52064_half_map_2.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 440 440 440 0 0 0 440 440 440 461.99997 461.99997 461.99997 90.0 90.0 90.0 X Y Z -4.4903774 3.7126036 0.0015606211 0.46146518 1.05 1.05 1.05 AUTHOR ::::EMDATABANK.org::::EMD-52064:::: Half-map 1 of head-focused map of state E