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Human Dihydrofolate Reductase Complexed With NADPH and 2,4-Diamino-5-((7,8-dicarbaundecaboran-7-yl)methyl)-6-methylpyrimidine, a novel boron containing, nonclassical Antifolate
X-RAY DIFFRACTION
Starting Model(s)
Initial Refinement Model(s)
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Source
Accession Code
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other
UNPUBLISHED HUMAN DHFR STRUCTURE
Crystallization
Crystalization Experiments
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Method
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Details
1
VAPOR DIFFUSION, HANGING DROP
8
277
THE TERNARY COMPLEX OF DHFR WITH NADPH AND 39B WAS FORMED BY MIXING HUMAN DHFR (20 MG/ML IN 25 MM KPO4 (PH 7.0), 0.1 MM EDTA, AND 3 MM NAN3) WITH 60 MM NADPH, FOLLOWED 15 MINUTES LATER BY 60 MM OF INHIBITOR IN DMSO (FINAL CONCENTRATIONS OF 2 MM NADPH AND 2 MM INHIBITOR). THIS COMPLEX SOLUTION WAS MIXED WITH AN EQUAL VOLUME OF PRECIPITANT CONTAINING 24-33% PEG 4000, 0.2 M LI2SO4, 0.1 M TRIS CL (PH 7.9-8.4), 5% GLYCEROL, AND EQUILIBRATED WITH THE PRECIPITANT BY HANGING DROP VAPOR DIFFUSION AT 277 K. THE CRYSTAL GREW IN ABOUT 3 WEEKS. THE CRYSTAL WAS FLASH-COOLED DIRECTLY IN LIQUID NITROGEN AFTER HARVESTING INTO MOTHER LIQUOR CONTAINING 10% GLYCEROL. NOTE THAT THE INHIBITOR IS ACTUALLY A RACEMIC MIXTURE OF 39B AND ITS ENANTIOMER, HERE CALLED 39E. IT IS THE RACEMATE THAT IS BOUND IN THE CRYSTAL, REPRESENTED IN THE COORDINATES AS A 1:1 STATISTICALLY-DISORDERED MIXTURE OF 39B AND 39E.