The phosphotransferase system of Corynebacterium glutamicum: features of sugar transport and carbon regulation.
In this review, we describe the phosphotransferase system (PTS) of Corynebacterium glutamicum and discuss genes for putative global carbon regulation associated with the PTS. C. glutamicum ATCC 13032 has PTS genes encoding the general phosphotransferases enzyme I, HPr and four enzyme II permeases, specific for glucose, fructose, sucrose and one yet unknown substrate. C. gluamicum has a peculiar sugar transport system involving fructose efflux after hydrolyzing sucrose transported via sucrose EII. Also, in addition to their primary PTS, fructose and glucose are each transported by a second transporter, glucose EII and a non-PTS permease, respectively. Interestingly, C. glutamicum does not show any preference for glucose, and thus co-metabolizes glucose with other sugars or organic acids. Studies on PTS-mediated sugar uptake and its related regulation in C. glutamicum are important because the production yield of lysine and cell growth are dependent on the PTS sugars used as substrates for fermentation. In many bacteria, the PTS is also involved in several regulatory processes. However, the detailed molecular mechanism of global carbon regulation associated with the PTS in this organism has not yet been revealed.
Moon
Min-Woo
MW
Systems Microbiology Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Yuseong, Daejeon, Korea.
Park
Sun-Yang
SY
Choi
Soo-Keun
SK
Lee
Jung-Kee
JK
D001692:Biological Transport; D002244:Carbon / Q000378:metabolism*; D048230:Corynebacterium glutamicum / Q000201:enzymology / Q000378:metabolism*; D005632:Fructose / Q000378:metabolism*; D005947:Glucose / Q000378:metabolism*; D008239:Lysine / Q000378:metabolism; D010770:Phosphotransferases / Q000502:physiology*; D013395:Sucrose / Q000378:metabolism*
D005632:Fructose; D013395:Sucrose; D002244:Carbon; D010770:Phosphotransferases; D005947:Glucose; D008239:Lysine