Metabolic 13C-labeling of an antitumor (1-->3)-beta-D-glucan, SSG, from Sclerotinia sclerotiorum IFO 9395.
A (1-->3)-beta-D-glucan, SSG, from Sclerotinia sclerotiorum IFO 9395 was metabolically labeled using [1-13C] and [2-13C]glucose, and the fate of the 13C-label was examined by 13C-NMR spectroscopy. 13C-NMR spectra of metabolically labeled SSG (13C-SSG) showed that most of the 13C-label in glucose residues of 13C-SSG were recovered from the originally labeled sites of carbon in glucose residue, and suggested little rearrangement during take-up from the medium. In the case of poor SSG producing culture conditions (reduced shaking rate), 13C-glucose incorporation in SSG molecule was similar to that in the case of high SSG-producing culture conditions. In addition, significant amounts of 13C-labeled trehalose were found in 13C-NMR spectra of the mycelium cultured in both poor and high SSG-producing conditions. These results suggested that different culture conditions affected SSG production, but not the metabolism of glucose and the biosynthetic pathway of SSG.
Suda
M
M
Laboratory of Immunopharmacology of Microbial Products, Tokyo College of Pharmacy, Japan.
Ohno
N
N
Adachi
Y
Y
Yadomae
T
T
D000970:Antineoplastic Agents / Q000378:metabolism*; D001203:Ascomycota / Q000378:metabolism*; D002247:Carbon Isotopes; D003470:Culture Media; D005936:Glucans / Q000378:metabolism*; D005947:Glucose / Q000378:metabolism; D007553:Isotope Labeling; D009682:Magnetic Resonance Spectroscopy; D047071:beta-Glucans
D000970:Antineoplastic Agents; D002247:Carbon Isotopes; D003470:Culture Media; D005936:Glucans; D047071:beta-Glucans; C033363:beta-1,3-glucan; D005947:Glucose