CRYSTAL STRUCTURE ANALYSIS OF A FLUORESCENT FORM OF H-RAS P21 IN COMPLEX WITH GDP

A Newly Designed Microspectrofluorometer for Kinetic Studies on Protein Crystals in Combination with X-Ray Diffraction

AN IANBD FLUOROPHORE WAS ATTACHED TO CYS-32

H-RAS P21, TRANSFORMING PROTEIN P21, C-H-RAS-1

MTEYKLVVVGAGGVGKSALTIQLIQNHFVDECDPTIEDSYRKQVVIDGETCLLDILDTAGQEEYSAMRDQYMRTGEGFLC
VFAINNTKSFEDIHQYREQIKRVKDSDDVPMVLVGNKSDLAARTVESRQAQDLARSYGIPYIETSAKTRQGVEDAFYTLV
REIRQH

PROTEIN SOLUTION: 17.22 MG/ML PROTEIN, 64 MM TRIS PH 7.6, 20 MM MAGNESIUM CHLORIDE, 10 MM DTT, 0,1 MM SODIUM AZIDE; RESERVOIR SOLUTION: 64 MM TRIS PH 7.6, 20 MM MAGNESIUM CHLORIDE, 10 MM DTT, 0,1 MM SODIUM AZIDE, 35% PEG 400 MIXTURE OF EQUAL VOLUMES OF PROTEIN AND RESERVOIR SOLUTION, VAPOR DIFFUSION, HANGING DROP, TEMPERATURE 291.15K

ENGINEERED RESIDUE IN CHAIN X, TYR 32 TO CYS ENGINEERED RESIDUE IN CHAIN X, CYS 118 TO SER

HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS. AN IANBD FLUOROPHORE WAS ATTACHED TO CYS-32. THE STRUCTURE WAS REFINED USING TWO ALTERNATIVE CONFORMATIONS FOR THE WHOLE PROTEIN CHAIN. THE CLOSE CONTACTS WITH WATER MOLECULES ARE CAUSED BY THE TREATMENT OF THE WHOLE PROTEIN CHAIN WITH TWO ALTERNATIVE CONFORMATIONS, BUT ONLY ONE POSITION PER WATER MOLECULE.

SIGNALING PROTEIN, GUANINE NUCLEOTIDE BINDING PROTEIN, FLUORESCENCE, MEMBRANE, LIPOPROTEIN, PALMITATE, PRENYLATION