The conditions of independent variables and cephamycin C production results (observed and predicted) are shown in Tables 1 and 2. Table 1 Range and levels of the independent variables lysine (Lys) and alpha-aminoadipic acid (AAA), NU7441 nmr in coded and original units, according to the two-factor, three-level central-composite-based, face-centered, experimental design (CCF); the response variable is cephamycin C concentration (CephC) obtained at 72-hour cultivation Run Independent variables Response Coded units Original units (g l-1) CephC (mg l-1) x Lys x AAA x Lys x AAA Measured* Predicted 1 -1 -1 0.9 0 25.0 ± 8.2 15.5 2 0 -1 3.2 0 45.0 ± 9.6 52.7 3 +1 -1 5.5 0 55.0 ± 5.9 56.7 4 -1 0 0.9 0.32 44.1 ± 0.9 57.8 5 0 0 3.2 0.32 105.8 ± 6.6 100.5 6 +1 0 5.5 0.32 118.5 ± 6.4 110.0 7 0 +1 3.2 0.64 112.4 ± 0.0 110.6 8 0 +1 3.2 0.64 102.8 ± 0.0 110.6 9 0 +1 3.2 0.64 117.8 ± 0.0 110.6 10 0 +1 3.2 0.64 112.0 ± 0.0 110.6 11 -1 +1 0.9 0.64 66.7 ± 7.7 62.4 12 +1 +1 5.5 0.64 118.8 ± 9.6 125.6 *The cultivations were performed PF-6463922 in vitro in triplicate,

with the exception of cultivation at condition (0,+1) performed in quadruplicate; SD = standard SB-3CT deviation. Table 2 Range and levels of independent variables lysine (Lys), 1,3-diaminopropane (1,3D), cadaverine (Cad), and putrescine (Put), in coded and original units, according to two-factor, three-level central-composite-based, face-centered, experimental designs (CCF); the response variable is cephamycin C concentration (CephC) obtained at 72-hour cultivation   Independent variables Response   Coded units Original units (g l-1) CephC (mg l-1)   Lys + 1,3D Lys + Cad Lys + Put

Run x Lys x i x Lys x 1,3D x Cad x Put Measured* Predicted Measured* Predicted Measured* Predicted 1 -1 -1 0.0 0.0 0.0 0.0 18.1 ± 3.0 10.6 19.0 ± 2.7 22.7 18.0 ± 2.7 16.7 2 0 -1 3.7 0.0 0.0 0.0 45.6 ± 7.2 59.9 45.6 ± 2.2 39.1 47.3 ± 3.2 53.9 3 +1 -1 7.4 0.0 0.0 0.0 72.3 ± 4.1 64.9 72.1 ± 1.9 74.7 75.5 ± 3.6 70.3 4 -1 0 0 2.5 3.5 0.2 47.6 ± 3.9 53.9 34.7 ± 3.5 30.2 31.1 ± 2.2 33.8 5 0 0 3.7 2.5 3.5 0.2 108.9 ± 0.0 109.2 40.5 ± 0.0 41.2 63.1 ± 0.0 64.6 6 0 0 3.7 2.5 3.5 0.2 122.1 ± 0.0 109.2 35.9 ± 0.0 41.2 75.0 ± 0.0 64.6 7 0 0 3.7 2.5 3.5 0.2 100.7 ± 0.0 109.2 42.0 ± 0.0 41.2 69.0 ± 0.0 64.6 8 0 0 3.7 2.5 3.5 0.2 120.0 ± 0.0 109.2 41.1 ± 0.0 41.2 64.9 ± 0.0 64.6 9 +1 0 7.4 2.5 3.5 0.2 114.4 ± 13.6 120.2 74.2 ± 2.1 71.5 64.0 ± 3.4 74.