An enzymatically produced novel cyclomaltopentaose cyclized from amylose by an alpha-(1-->6)-linkage, cyclo-{-->6)-alpha-D-Glcp-(1-->4)-alpha-D-Glcp-(1-->4)-alpha-D-Glcp-(1-->4)-alpha-D-Glcp-(1-->4)-alpha-D-Glcp-(1-->}.
A bacterial strain AM7, isolated from soil and identified as Bacillus circulans, produced two kinds of novel cyclic oligosaccharides. The cyclic oligosaccharides were produced from amylose using a culture supernatant of the strain as the enzyme preparation. The major product was a cyclomaltopentaose cyclized by an alpha-(1-->6)-linkage, cyclo-{-->6)-alpha-D-Glcp-(1-->4)-alpha-D-Glcp-(1-->4)-alpha-D-Glcp-(1-->4)-alpha-D-Glcp-(1-->4)-alpha-D-Glcp-(1-->}. The other minor product was cyclomaltohexaose cyclized by an alpha-(1-->6)-linkage, cyclo-{-->6)-alpha-D-Glcp-(1-->4)-alpha-D-Glcp-(1-->4)-alpha-D-Glcp-(1-->4)-alpha-D-Glcp-(1-->4)-alpha-D-Glcp-(1-->4)-alpha-D-Glcp-(1-->}. We propose the names isocyclomaltopentaose (ICG5) and isocyclomaltohexaose (ICG6) for these novel cyclic maltooligosaccharides having one alpha-(1-->6)-linkage. ICG5 was digested by alpha-amylase derived from Aspergillus oryzae, cyclomaltodextrin glucanotransferase (CGTase) from Bacillus stearothermophilus, and maltogenic alpha-amylase. On the other hand, ICG6 was digested by CGTase from B. stearothermophilus and B. circulans, and maltogenic alpha-amylase. This is the first report of enzymatically produced cyclomaltopentaose and cyclomaltohexaose, which have an alpha-(1-->6)-linkage in their molecules.
Watanabe
Hikaru
H
Amase Institute, Hayashibara Biochemical Laboratories, Inc., 7-7 Amase minami-machi, Okayama 700-0834, Japan. h-watanabe@hayashibara.co.jp
Nishimoto
Tomoyuki
T
Sonoda
Tomohiko
T
Kubota
Michio
M
Chaen
Hiroto
H
Fukuda
Shigeharu
S
D000688:Amylose / Q000378:metabolism*; D001236:Aspergillus oryzae / Q000201:enzymology; D001407:Bacillus / Q000145:classification / Q000201:enzymology* / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D002240:Carbohydrate Sequence; D002851:Chromatography, High Pressure Liquid; D002855:Chromatography, Thin Layer; D003470:Culture Media / Q000494:pharmacology; D003500:Cyclization; D003505:Cyclodextrins / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism*; D001411:Geobacillus stearothermophilus / Q000201:enzymology*; D005964:Glucosyltransferases / Q000378:metabolism; D006026:Glycoside Hydrolases / Q000378:metabolism; D008970:Molecular Weight; D019906:Nuclear Magnetic Resonance, Biomolecular; D009844:Oligosaccharides / Q000096:biosynthesis* / Q000737:chemistry / Q000378:metabolism; D021241:Spectrometry, Mass, Electrospray Ionization; D000516:alpha-Amylases / Q000378:metabolism
D003470:Culture Media; D003505:Cyclodextrins; D009844:Oligosaccharides; D000688:Amylose; D005964:Glucosyltransferases; C019963:cyclomaltodextrin glucanotransferase; D006026:Glycoside Hydrolases; D000516:alpha-Amylases; C120909:glucan 1,4-alpha-maltohydrolase