REL RCSB RCSB RCSB 2008-05-08 2008-05-14 2009-04-23 2011-07-08 A 3D EM map of the subcomplex Orc1-5 of the yeast origin recognition complex (ORC). Chen Z Speck C Wendel P Tang C Stillman B Li H Negative stain electron microscopy, single particle image reconstruction, yeast replication initiation, origin recognition complex, DNA binding protein Chen Z Speck C Wendel P Tang C Stillman B Li H The architecture of the DNA replication origin recognition complex in Saccharomyces cerevisiae. PROC.NAT.ACAD.SCI.USA 105 10326 10331 2008 18647841 doi:10.1073/pnas.0803829105 Yeast ORC subcomplex Orc1-5. Yeast ORC subcomplex Orc1-5.
The sample was purified by gel filtration and was indeed monodisperse.
One heteropentamer (Orc1-Orc2-Orc3-Orc4-Orc5) 5 0.362 Chromosomal replication origin recognition protein Orc1p Yeast Nucleus Nucleus 0.12 0.12 1 monomer true Sf9 insect cells bvORC1 Orc2 S. cerevisiae Yeast Nucleus Nucleus 0.071 0.071 1 monomer true Sf9 insect cells bvORC2 Orc3 S. cerevisiae yeast Nucleus Nucleus 0.062 0.062 1 Monomer true Sf9 insect cells bvORC3 Orc4 S. cerevisiae yeast Nucleus Nucleus 0.056 0.056 1 Monomer true bvORC4 SF9 insect cells Orc5 S. cerevisiae yeast Nucleus Nucleus 0.053 0.053 1 Monomer true bvORC5 SF9 insect cells singleParticle particle 0.1 7.6
50 mM Hepes-KOH pH 7.6, 100 mM potassium glutamate, 5 mM MgCl2, 1 mM EGTA, and 1mM ATP-gamma-S
 NEGATIVE
A 6.0 micro liter drop of sample solution was applied to a glow-discharged 300-mesh copper grid covered with a thin layer of carbon film, and after a brief incubation of 30 - 60 s, the excess sample solution was blotted with a small piece of filter paper. The grid was then stained in a deep stain procedure by three consecutive 5 micro liter drops of 2.0% uranyl acetate aqueous solution. Each drop was left on grid for 15 - 20 s at room temperature before blotting. After blotting the last stain drop, the grid was quickly dried by a stream of argon to prevent crystallization of the stain salt.
300 mesh copper grid covered with continuous carbon film
 ETHANE OTHER JEOL 1200EX FLOOD BEAM BRIGHT FIELD LAB6 120 5.6 1.2 1.5 50000.0 OTHER objective lens astigmatism was corrected at 250,000 times magnification 2 2005-10-01 KODAK SO-163 FILM NIKON SUPER COOLSCAN 9000 12.7 50 10 1.3 14. Eucentric
Each micrograph
 OTHER 25.0 FSC 0.5 CUT-OFF EMAN, SPIDER 8935 100 emd_5013.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 100 100 100 -50 -50 -50 100 100 100 254 254 254 90 90 90 X Y Z -0.0000278656 9.865919999999999 0.0892259 0.530543 2.54 2.54 2.54 2.0 This is a 3D negatively stained EM map of a subcomplex (Orc1-5) of the yeast origin recognition complex (ORC - Orc1-6). This subcomplex does not contain the smallest subunit Orc6 of ORC.
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