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HELICAL ASYMMETRIC UNIT OF AN SGRAI DNA-BOUND DIMER
Specimen Preparation
Sample Aggregation State
HELICAL ARRAY
Vitrification Instrument
HOMEMADE PLUNGER
Cryogen Name
ETHANE
Sample Vitrification Details
SPECIMENS WERE PREPARED FOR CRYO-EM BY APPLYING 3 MICROLITERS OF SAMPLE IN BINDING BUFFER TO A HOLEY CARBON C-FLAT GRID (CF-2- 2-400) (PROTOCHIPS, INC ...
SPECIMENS WERE PREPARED FOR CRYO-EM BY APPLYING 3 MICROLITERS OF SAMPLE IN BINDING BUFFER TO A HOLEY CARBON C-FLAT GRID (CF-2- 2-400) (PROTOCHIPS, INC.) THAT HAD BEEN PLASMA CLEANED (GATAN, SOLARUS) FOR 5 SEC. THE SAMPLE WAS ALLOWED TO ADSORB TO THE GRID FOR 30 SEC., THEN PLUNGE-FROZEN INTO LIQUID ETHANE USING A MANUAL CRYO-PLUNGER AT 4 C.
3D Reconstruction
Reconstruction Method
SINGLE PARTICLE
Number of Particles
1918
Reported Resolution (Å)
8.6
Resolution Method
Other Details
WE FIRST CONDUCTED 25 ITERATIONS OF THE IHRSR ROUTINE TO REFINE THE FULL CRYODATA SET AND OBTAIN FINAL HELICAL PARAMETERS -- -86.2 HELICAL TWIST AND 2 ...
WE FIRST CONDUCTED 25 ITERATIONS OF THE IHRSR ROUTINE TO REFINE THE FULL CRYODATA SET AND OBTAIN FINAL HELICAL PARAMETERS -- -86.2 HELICAL TWIST AND 21.6 A RISE. SUBSEQUENTLY, THE MODEL FROM IHRSR WAS USED FOR REFINEMENT IN FREALIGN SPECIFYING DIFFERENT DOSE- -FRACTIONATED STACKS FOR THE REFINEMENT (32 E- PER A2) AND RECONSTRUCTION (16 E- PER A2) ROUTINES. THE FINAL RECONSTRUCTION WAS OBTAINED FROM 1,918 FILAMENT SEGMENTS, AVERAGED 8 TIMES TO ACCOUNT FOR THE HELICAL SYMMETRY BASES WERE OMITTED FROM THE FITTED DNA. ONLY THE PHOSPHATE-SUGAR BACKBONE IS SHOWN. SUBMISSION BASED ON EXPERIMENTAL DATA FROM EMDB EMD-2441. (DEPOSITION ID: 11901).