The strong interaction of an octyl chain with M. smegmatis cells was paired with high specificity of the galactofuranose ring against mycobacteria growth.
辛基链与M. smegmatis细胞的强相互作用与半乳糖醛酸环对抗分枝杆菌生长的高特异性相配。
Fungal Glucuronoyl Esterases and Substrate Uronic Acid Recognition
作者:Miroslava ĎURANOVÁ、Ján HIRSCH、Katarína KOLENOVÁ、Peter BIELY
DOI:10.1271/bbb.90486
日期:2009.11.23
Glucuronoyl esterases are enzymes involved in microbial plant cell-wall degradation. In this study we purified and characterized two recombinant Phanerochaete chrysosporium glucuronoyl esterases, PcGE1 and PcGE2. The catalytic activity of these and previously described glucuronoyl esterases was investigated on new synthetic substrates, methyl esters of uronic acids and their glycosides, prepared by esterification with ethereal diazomethane.The data obtained indicate that the enzymes hydrolyzed efficiently not only esters of 4-O-methyl-d-glucuronic acid, but also methyl esters of d-glucuronic acid carrying a 4-nitrophenyl aglycon. Moreover, the fact that they did not recognize the 4-epimers of these compounds, the d-galacturonic acid derivatives, supports the hypothesis that these carbohydrate esterases attack ester linkages between 4-O-methyl-d-glucuronic acid of glucuronoxylan and lignin alcohols.