Different quaternary structures of human RECQ1 are associated with its dual enzymatic activity.

REL PDBe PDBe PDBe 2006-10-19 2006-10-19 2006-10-19 2011-05-26 Different quaternary structures of human RECQ1 are associated with its dual enzymatic activity. Muzzolini L Beuron F Patwardhan A Popuri V Cui S Niccolini B Rappas M Freemont PS Vindigni A Muzzolini L Beuron F Patwardhan A Popuri V Cui S Niccolini B Rappas M Freemont PS Vindigni A Different quaternary structures of human RECQ1 are associated with its dual enzymatic activity. PLOS BIOL. 5 e20 e20 2007 17227144 doi:10.1371/journal.pbio.0050020 Untagged wild-type RECQ1 and ssDNA Untagged wild-type RECQ1 and ssDNA Most likely an hexamer 2 0.4 0.44 Size-exclusion chromatography RECQ1 Homo sapiens Human 0.073 0.079 6 Possibly hexameric false Single stranded DNA - oligo-dT-30 DNA SINGLE STRANDED true singleParticle particle 0.015 7.4

20mM TrisHCl pH 7.4, 150mM KCl, 2mM MgCl2

NEGATIVE

RECQ1 incubated with 1.5 molar excess of ssDNA for 15 min, then adsorbed onto glow-discharged carbon-coated grids and negatively-stained with 1% uranyl acetate.

ETHANE FEI/PHILIPS CM200FEG FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 200 50000.0 48600.0 GATAN LIQUID NITROGEN 0 2005-06-06 KODAK SO-163 FILM OTHER 6.35 8. Eucentric C1 OTHER 28.0 FSC 0.5 CUT-OFF Imagic 1896

Imagic

148 emd_1276.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 100 100 100 0 0 0 100 100 100 250 250 250 90 90 90 X Y Z -0.263084 0.36889 0.00241591 0.0254423 2.5 2.5 2.5 0.0405 Map of untagged wild-type RECQ1 + ssDNA, filtered using a 3D Gaussian low-pass filter with a half-width of 17 Angstrom.

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