“…In this sense, the use of enzymes from purine and pyrimidine salvage pathway as biocatalysts for the synthesis of nucleosides and nucleotides has been extensively reported ( Mikhailopulo, 2007 ; Fernández-Lucas et al, 2010 ; Fresco-Taboada et al, 2013; Fernández-Lucas , 2015 ; Lapponi et al, 2016 ; Del Arco and Fernández-Lucas, 2017; Ding and Ou , 2017 ; Lewkowicz and Iribarren, 2017 ; Serra et al, 2017 ; Acosta et al, 2018 ; Del Arco et al, 2018b , 2019a ; Pérez et al, 2018 ; Kamel et al, 2019 ; Ubiali and Speranza, 2019 ).…”