(A) Schematic diagram of the pathway for Neu5Ac metabolism in C. glutamicum. SiaEFGI, ABC transporter for Neu5Ac; NanA, N-acetylneuraminic acid lyase; NanK, N-acetylmannosamine kinase; NanE, N-acetylmannosamine-6P epimerase; NagA, N-acetylglucosamine-6P deacetylase; NagB, glucosamine-6P deaminase; PtsG, glucose-specific EII permease of the PTS. (B) Genetic organization of the genes for Neu5Ac utilization in C. glutamicum.