- Dynamic light scattering evidence for a ligand-induced motion between the two domains of glucoamylase G1 of Aspergillus niger with heterobivalent substrate analogues
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Heterobifunctional ligands that bind at the same time to the catalytic domain and to the starch-binding domain of glucoamylase induce a conformational change of the protein, as shown by dynamic light scattering. The ligands consist of acarbose and β-cyclo
- Payre, Nathalie,Cottaz, Sylvain,Boisset, Claire,Borsali, Redouane,Svensson, Birte,Henrissat, Bernard,Driguez, Hugues
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p. 974 - 977
(2007/10/03)
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- TOTAL SYNTHESIS OF ACARBOSE AND ADIPOSIN-2
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The first total synthesis is described of the α-D-glucosidase inhibitor acarbose (1a). 1,6-Anhydro-4'-O-(3,4-anhydro-6-deoxy-α-D-galactopyranosyl)-β-maltose (21), prepared from 1,6-β-maltotriose (3a), and (+)-4,7:5,6-di-O-isopropilydenevalienamine (28) gave two pseudo-tetrasaccharide derivatives separable as the per-O-acetyl derivatives (29 and 31) by chromatography, and their structures were established on the basis of 1H-n.m.r. spectroscopy.On acetolysis followed by acetylation, 29 afforded the peracetate (1b), which was O-deacetylated to give 1a.Likewise, adiposin-2 (2a), the 6''-hydroxy analogue of 1a, isolated from fermentation broth of Streptomyces calvus TM-521, was synthesised.
- Shibata, Yasushi,Ogawa, Seiichiro
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p. 309 - 322
(2007/10/02)
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