REL RCSB RCSB RCSB 2011-10-05 2011-11-28 2012-05-21 2012-05-30 3D map of CETP-HDL complex at 14 Angstrom by optimized negative-staining EM and single-particle reconstruction Zhang L Yan F Zhang S Lei D Charles MA Cavigiolio G Oda M Krauss RM Weisgraber KH Rye KA Pownall HJ Qiu X Ren G Cholesteryl ester transfer protein, lipoprotein, CETP, LDL, VLDL, HDL, electron microscopy, CETP mechanism Zhang L Yan F Zhang S Lei D Charles MA Cavigiolio G Oda M Krauss RM Weisgraber KH Rye KA Pownall HJ Qiu X Ren G Structural basis of transfer between lipoproteins by cholesteryl ester transfer protein. NAT.CHEM.BIOL. 8 342 349 2012 22344176 doi:10.1038/nchembio.796 Recombinant human CETP (about 53 kDa before post-translational modifications) was expressed in the dihydrofolate reductase-deficient Chinese hamster ovary cell line DG44. The spherical HDL were converted from discoidal reconstituted HDL (rHDL)by incubation with fatty acid-free bovine serum albumin, beta-mercaptoethanol, ultracentrifugally isolated LDL and purified lecithin-cholesterol acyltransferase (LCAT), and then isolated by sequential ultracentrifugation in the density range of 1.07-1.21 g/ml. Recombinant human CETP (about 53 kDa before post-translational modifications) was expressed in the dihydrofolate reductase-deficient Chinese hamster ovary cell line DG44. The spherical HDL were converted from discoidal reconstituted HDL (rHDL)by incubation with fatty acid-free bovine serum albumin, beta-mercaptoethanol, ultracentrifugally isolated LDL and purified lecithin-cholesterol acyltransferase (LCAT), and then isolated by sequential ultracentrifugation in the density range of 1.07-1.21 g/ml.
The CETP sample was thawed from storage at -70 degrees Celcius before being used, the HDL sample was freshly prepared.
one CETP bound to one HDL 2 0.074 0.053 Sedimentation Cholesteryl ester transfer protein Homo sapiens human plasma 0.074 0.053
optimized negative stain method was used for the CETP.HDL complex reconstruction
1 monomer true Cricetulus griseus singleParticle particle 0.005 7.4
DPBS buffer
 NEGATIVE
CETP.HDL complex specimens were prepared for EM by the optimized NS protocol (reported in Zhang, L., J. Lipid Research, 2010, 51,5, 1228-36, and 2011, 52,1, 175-84.)
thin-carbon-coated 300 mesh copper grid (Cu-300CN, Pacific Grid-Tech, USA)
 NONE OTHER FEI TECNAI 20 OTHER BRIGHT FIELD LAB6 200 2.0 0.1 0.7 80000.0 GATAN LIQUID NITROGEN 94 99 96
Lose dose mode
GATAN ULTRASCAN 4000 (4k x 4k) 50 Gatan 626
The particles were initially selected using an automatic selection program, boxer, then manually adjusted by deleted the obviously poor quality particles.
ctffind3 in the FREALIGN software package, and corrected by EMAN
 OTHER 14.0 FSC 0.5 CUT-OFF EMAN 8879 317 emd_5347.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 128 128 128 -64 -64 -64 128 128 128 359.936 359.936 359.936 90.0 90.0 90.0 X Y Z -1.40113115 19.586109159999999 0.15034387 1.09604871 2.812 2.812 2.812 1.0 AUTHOR This is 3D reconstruction of HDL-CETP by negative-staining EM
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 2OBD RIGID BODY FIT Chimera
Protocol: Chimera Rigid Body Docking
cross-correlation REAL