2017-11-08 REL PDBe PDBe PDBe 2017-08-13 2017-10-18 2017-10-18 2017-11-08 Elad N Bellapadrona G Houben L Sagi I Elbaum M Elad N Bellapadrona G Houben L Sagi I Elbaum M Proc. Natl. Acad. Sci. U.S.A. US 114 11139 11144 2017 28973937 doi:10.1073/pnas.1708609114 1091-6490 0040 PNASA6 EMD-3848 other EM volume

Contains ferritin with Zn reconstructed from cryo-STEM images.

EMD-3849 associated EM volume Human heavy chain ferritin with Fe at low stoichiometry Human heavy chain ferritin with Fe at low stoichiometry 0

Bacterially expressed and purified human heavy chain ferritin mixed with a 100 fold molar excess of Fe(II)SO4

Homo sapiens Escherichia coli 0.504 singleParticle particle 0.13 7.2 50.0 HEPES-NaOH 0.2 NaCl Quantifoil R2/1 COPPER 200 CARBON HOLEY CARBON CONTINUOUS GLOW DISCHARGE AIR ETHANE 95 297 LEICA EM GP

For metal loading, stock protein (2.9 mg/ml) was diluted to 0.25 mg/ml and mixed with a 100 fold molar excess of Fe(II)SO4.

FEI TECNAI F20 OTHER OTHER FIELD EMISSION GUN 200 70.0 2.0 450000. GATAN 626 SINGLE TILT LIQUID NITROGEN CRYO TRANSFER HOLDER NITROGEN

STEM mode imaging using Fischione model 3000 HAADF detector. Camera length: 520 mm.

OTHER 2048 2048 1 58 127.0

ADF images collected with a Fischione Model 3000 high-angle annular DF detector

1

Fischione 3000 HAADF

1484

Manually selected

2CEI

The initial model was prepared from the of the human ferritin heavy chain crystal structure from which all heavy atoms were removed. The protein PDB coordinates were converted to structure factors and low pass filtered to 4 nm.

O 21.0 FSC 0.143 CUT-OFF RELION 1.4 1484 PROJECTION MATCHING PROJECTION MATCHING RELION 1.4