WILD-TYPE AND FEEDBACK-RESISTANT PHOSPHORIBOSYL PYROPHOSPHATE SYNTHETASES FROM BACILLUS AMYLOLIQUEFACIENS: PURIFICATION, CHARACTERIZATION, AND APPLICATION TO INCREASE PURINE NUCLEOSIDE PRODUCTION Article Zakataeva N.P., Romanenkov D.V., Skripnikova V.S., Vitushkina M.V., Livshits V.A., Kivero A.D., Novikova A.E. Applied Microbiology and Biotechnology. Vol. 93. 2012. P. 2023-2033