Action of poly (alpha-L-guluronate)lyase from Corynebacterium sp. ALY-1 strain on saturated oligoguluronates.
A kinetic analysis of degradation of saturated oligoguluronates by poly(alpha-L-guluronate)lyase from Corynebacterium sp. ALY-1 strain was done. The saturated oligoguluronates were prepared by hydrolyzing poly alpha-1,4-L-guluronate from alginate with HCl, and then by gel filtration on a Bio-Gel P-6 column. The saturated pentaguluronate or above were rapidly degraded by the enzyme, while tetraguluronate was slowly degraded. From the dependency of the catalytic rate constant (kcat) on the degree of polymerization of substrates, the enzyme was found to have a subsite size corresponding to hexaguluronate units. The action pattern of the enzyme on hexaguluronate suggested that the catalytic site of the enzyme was matched to the linkage between the second and third uronic residue from the non-reducing end, since the substrate was mainly split into a unsaturated tetramer and a saturated dimer from a HPLC analysis.
Kagawa Prefectural Fermentation & Food Experimental Station, Japan.
Y
Y
Matsubara
K
K
Iwasaki
T
T
Muramatsu
D000595:Amino Acid Sequence; D001483:Base Sequence; D002851:Chromatography, High Pressure Liquid; D003001:Cloning, Molecular; D003352:Corynebacterium / Q000201:enzymology* / Q000235:genetics; D005798:Genes, Bacterial; D006603:Hexuronic Acids / Q000494:pharmacology*; D007700:Kinetics; D008358:Mannose / Q000031:analogs & derivatives / Q000494:pharmacology; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000494:pharmacology*; D011133:Polysaccharide-Lyases / Q000378:metabolism*; D011487:Protein Conformation; D013045:Species Specificity; D014574:Uronic Acids / Q000494:pharmacology*
D006603:Hexuronic Acids; D009844:Oligosaccharides; D014574:Uronic Acids; D011133:Polysaccharide-Lyases; C022416:poly-alpha-L-guluronate lyase; D008358:Mannose