WILD-TYPE AND FEEDBACK-RESISTANT PHOSPHORIBOSYL PYROPHOSPHATE SYNTHETASES FROM BACILLUS AMYLOLIQUEFACIENS: PURIFICATION, CHARACTERIZATION, AND APPLICATION TO INCREASE PURINE NUCLEOSIDE PRODUCTION ArticleZakataeva 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