REL PDBe PDBe PDBe 2008-02-13 2008-02-13 2009-04-20 2014-04-30 Iterative Helical Real Space Reconstruction of Histone Octamer Helical Tubes Frouws TD Patterton HG Sewell BT histone, octamer, H2A, H2B, H3, H4, nucleosome, IHRSR, helical, tubular crystal Frouws TD Patterton HG Sewell BT Histone octamer helical tubes suggest that an internucleosomal four-helix bundle stabilizes the chromatin fiber. BIOPHYS.J. 96 3363 3371 2009 19383479 doi:10.1016/j.bpj.2008.10.075 3c9k FULLOVERLAP Histone Octamer Tubular Crystals Histone Octamer Tubular Crystals
crystalline tubes
octameric, C11, and helical 4 0.109 0.109 sequence histone H2A Gallus gallus Chicken Blood Erythrocytes Nucleus Nucleus 0.014 0.014
Histone octamers purified from chicken blood
2 octamer false IPR002119 histone H2B Gallus gallus Chicken Blood Erythrocytes Nucleus Nucleus 0.014 0.014
Histone octamers purified from chicken blood
2 octamer false IPR000558 histone H3 Gallus gallus Chicken Blood Erythrocytes Nucleus Nucleus 0.015 0.015
Histone octamers purified from chicken blood
2 octamer false IPR000164 histone H4 Gallus gallus Chicken Blood Erythrocytes Nucleus Nucleus 0.011 0.011
Histone octamers purified from chicken blood
2 octamer false IPR001951 helical helicalArray 2 7.4
100mM Tris-HCl, 2M NaCl, 40% NH2SO4
 NEGATIVE
5 ul 0.4% Uranyl Acetate is added to 5 ul sample, grid is floated on mixture for 1 min, then washed twice with 10 ul 0.2% Uranyl Acetate drops.
300 Mesh copper grid
 NONE OTHER
double dialysis
 ZEISS LEO912 FLOOD BEAM BRIGHT FIELD TUNGSTEN HAIRPIN 120 0.8 1.0 50000.0 OTHER 295 corrected at 80,000 times magnification Omega in-column 0.0 15.0
Zeiss LEO 912 microscope using low dose technique
KODAK SO-163 FILM OTHER 2 50 100
scanned on Ilford Leafscan at 2A per pixel and binned to 4A per pixel
1.0 16. Eucentric 0 0
Helices segmented into overlapping boxes using Boxer program from EMAN
65.12 7.56 D11 OTHER 20.0 FSC 0.5 CUT-OFF SPIDER
helical symmetry is searched for and imposed each iteration round on the backprojected volume.
Single axis tilt geometry. 4.1 degree increment for phi to cover an asymmetric wedge of 32.72 degrees. Therefore 8 reference projections.
 emd_1469.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 128 128 128 -64 -64 -64 128 128 128 512.0 512.0 512.0 90.0 90.0 90.0 X Y Z -0.0260648 0.04370119 0.00259267 0.00934648 4.0 4.0 4.0 0.018 EMDB surface rendering of histone octamer tubular crystal
::::EMDATABANK.org::::EMD-1469::::
 2HIO RIGID BODY FIT SPIDER
Protocol: Rigid body. Because of helical line group, the dyad axis is constrained to lie facing the helical axis and reduces the search to 2D. i.e. to rotations and translations about this dyad.
CC and VdW REAL