3FFT CRYSTAL STRUCTURE OF CHEY DOUBLE MUTANT F14E, E89R COMPLEXED WITH BEF3- AND MN2+ SIGNALING PROTEIN, RESPONSE REGULATOR, RECEIVER DOMAIN, BEF3, TWO-COMPONENT SIGNAL TRANSDUCTION, CHEMOTAXIS, CYTOPLASM, FLAGELLAR ROTATION, MAGNESIUM, METAL-BINDING, PHOSPHOPROTEIN, TWO- COMPONENT REGULATORY SYSTEM