REL PDBe PDBe PDBe 2014-03-05 2014-04-09 2014-05-07 2014-05-07 Cryo-EM study of the chromatin fiber reveals a double helix twisted by tetra-nucleosomal units Song F Chen P Sun D Wang M Dong L Liang D Xu RM Zhu P Li G In vitro reconstituted 12x177 bp chromatin Song F Chen P Sun D Wang M Dong L Liang D Xu RM Zhu P Li G Cryo-EM study of the chromatin fiber reveals a double helix twisted by tetranucleosomal units SCIENCE 344 376 380 2014 24763583 doi:10.1126/science.1251413 In vitro reconstituted 12x177 bp chromatin In vitro reconstituted 12x177 bp chromatin Dodecamer 3 Core histone Xenopus laevis Nucleus
Octameric nucleosome core histone contains 2 copies histone H2A, H2B, H3 and H4. 12 octamer units constitutes the dodecamer.
2 Octamer true Escherichia coli BL21(DE3) Histone H1.4 Homo sapiens Human Nucleus
Each octamer contains 1 copy linker histone, histone H1.4
12 Monomer true Escherichia coli BL21(DE3) 601 DNA unidentified
12 tandem repeats; full length 2124 bp
GAGCATCCGGATCCCCTGGAGAATCCCGGTGCCGAGGCCGCTCAATTGGTCGTAGACAGCTCTAGCACCGCTTAAACGCACGTACGCGCTGTCCCCCGCGTTTTAACCGCCAAGGGGATTACTCCCTAGTCTCCAGGCACGTGTCACATATATACATCCTGTTCCAGTGCCGGACCC DNA DOUBLE HELIX false singleParticle particle 8.0
10 mM HEPES, pH 8.0, 0.1 mM EDTA
300 mesh R2.1 Quantifoil holey grid
 ETHANE 100 FEI VITROBOT MARK IV Sample absorbed for 1 to 1.5 min, blotted for 4 seconds before plunging FEI TITAN KRIOS FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 300 2.7 1.6 3.95 59000.0 FEI TITAN KRIOS AUTOGRID HOLDER Objective lens astigmatism was corrected at 155,000 times magnification
Parallel beam illumination
2012-03-01 GATAN ULTRASCAN 4000 (4k x 4k) 4424 18
CTF correction of each particle
 C1 OTHER 11.0 OTHER EMAN2 21000 emd_2600.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 352 352 352 -176 -176 -176 352 352 352 541.728 541.728 541.728 90.0 90.0 90.0 X Y Z -5.77575874 18.243227009999998 0.00000001 1.0 1.539 1.539 1.539 3.48 AUTHOR Reconstruction of 12x177 bp chromatin
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