CRYSTAL STRUCTURE OF P. AERUGINOSA BACTERIOPHYTOCHROME PHOTOSENSORY CORE MODULE MUTANT Q188L IN THE MIXED PR/PFR STATE TRANSFERASE, PHYTOCHROME, RED-LIGHT PHOTORECEPTOR, PHOTOCONVERSION, CHROMOPHORE, ATP-BINDING, KINASE, NUCLEOTIDE-BINDING, PHOSPHOPROTEIN, PHOTORECEPTOR PROTEIN, RECEPTOR, SENSORY TRANSDUCTION 3IBR