The kinetic parameters (Km and Vmax) values of the SAPCG enzyme from the Caldicoprobacter guelmensis sp. nov. strain D2C22T were 0.485 mM and 53,850 × 103U/mg with casein used as a substrate, respectively. The values recorded for the deduced turnover number (kcat) and catalytic efficiency (kcat/Km) were 26,925 × 103min − 1 and 55,515 min− 1mM −1, respectively. In fact,the catalytic efficiency of SAPCG (55,515 min−1mM−1) was higher than that of SAPB (45,265 min−1 mM−1) [17].