Figure 3
(a) Raw ESI–MS data (TIC = 4.33 × 104) and deconvoluted mass spectrum of OPPF697 purified protein prior to crystallization. The N-terminal His6 tag was removed by proteolytic cleavage during purification. (b) Image of OPPF697 crystal taken for mass-spectrometric analysis, which was grown in 0.1 M citrate pH 5, 3.2 M ammonium sulfate. (c) Raw ESI–MS data (TIC = 3.38 × 105) and deconvoluted mass spectrum of crystal-derived protein sample prepared by reservoir-solution and 2 × acetonitrile washing. |