   2.7.1.137 | purified detagged recombinant PI3K SH3 domain, residues 1-83, crystallized in presence of peptide ligands PD1R or PD1, the crystals do not contain the PD1 ligand, instead, the ligand binding site is partially occupied by residues Arg18 and Trp55 from the symmetry-related PI3K SH3 molecule. Sitting drop vapor diffusion method by mixing of 0.001 ml of protein-peptide mixture and 0.001 ml of reservoir solution containing for PD1R crystals 100 mM CAPS buffer, pH 10.5, 2 M ammonium sulfate and 0.2 M lithium sulfate or for PD1 crystals 100 mM Na-citrate buffer, pH 5.5, 0.5 M ammonium sulfate and 1 M lithium sulfate, 17°C, several weeks, X-ray diffraction structure determination and analysis at 1.7 A resolution |
