title: TMG-chitotriomycin, an enzyme inhibitor specific for insect and fungal beta-N-acetylglucosaminidases, produced by actinomycete Streptomyces anulatus NBRC 13369.
abstract: A novel beta-N-acetylglucosaminidase (GlcNAcase) inhibitor named TMG-chitotriomycin (1) was isolated from the culture filtrate of Streptomyces anulatus NBRC13369. The strain produced 1 only when colloidal chitin was used as the sole carbon source in the production medium. The structure of 1 was determined by spectral and constitutive sugar analyses of the corresponding alditol derivatives to be an equilibrated mixture of alpha-d-N,N,N-triMeGlcNH2-(1,4)-beta-d-GlcNAc-(1,4)-beta-d-GlcNAc-(1,4)-d-GlcNAc and its C-2 epimer of the reducing end residue. TMG-chitotriomycin (1) showed potent and selective inhibition of insect and fungal GlcNAcases with no inhibition of mammalian and plant GlcNAcases. In contrast, the known GlcNAcase inhibitor nagstatin potently inhibited all GlcNAcases. It should be emphasized that synthesized d-N,N,N-triMeGlcNH2, which is the component sugar of 1, showed no inhibition of the insect Spodoptera litura GlcNAcase. These results suggest that the (GlcNAc)3 unit positioned at the reducing end of 1 is essential for its enzyme inhibitory activity. The unique inhibitory spectrum of 1 will be useful to study chitinolytic systems and to develop selective fungicides or pesticides.
authors.affiliation: Laboratory of Bioresources Chemistry, The Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan.
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Usuki
authors.forename: Teruhiko
authors.initials: T
authors.lastname: Nitoda
authors.forename: Misato
authors.initials: M
authors.lastname: Ichikawa
authors.forename: Nahoko
authors.initials: N
authors.lastname: Yamaji
authors.forename: Takashi
authors.initials: T
authors.lastname: Iwashita
authors.forename: Hajime
authors.initials: H
authors.lastname: Komura
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kanzaki
mesh_terms: D000818:Animals; D001407:Bacillus / Q000145:classification / Q000201:enzymology; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002688:Chitinases / Q000037:antagonists & inhibitors; D004789:Enzyme Activation / Q000187:drug effects; D004791:Enzyme Inhibitors / Q000737:chemistry / Q000378:metabolism* / Q000494:pharmacology*; D007313:Insecta; D008969:Molecular Sequence Data; D010407:Penicillium / Q000201:enzymology*; D012680:Sensitivity and Specificity; D013045:Species Specificity; D018411:Spodoptera / Q000201:enzymology*; D013302:Streptomyces / Q000145:classification / Q000378:metabolism*; D013305:Streptomyces griseus / Q000201:enzymology; D013329:Structure-Activity Relationship; D013402:Sugar Alcohols / Q000737:chemistry / Q000494:pharmacology*; D048828:beta-N-Acetyl-Galactosaminidase / Q000037:antagonists & inhibitors*
chemical_list: D004791:Enzyme Inhibitors; D013402:Sugar Alcohols; C528826:TMG-chitotriomycin; D002688:Chitinases; D048828:beta-N-Acetyl-Galactosaminidase