Download MendeleyDiscovery of alpha-l-Glucosidase Raises the Possibility of alpha-l-Glucosides in Nature.
Shishiuchi, R., Kang, H., Tagami, T., Ueda, Y., Lang, W., Kimura, A., Okuyama, M.(2022) ACS Omega 7: 47411-47423
- PubMed: 36570207
- DOI: https://doi.org/10.1021/acsomega.2c06991
- Primary Citation of Related Structures:
7XSF, 7XSG, 7XSH - PubMed Abstract:
Glucose, a common monosaccharide in nature, is dominated by the d-enantiomer. Meanwhile, the discovery of l-glucose-utilizing bacteria and the elucidation of their metabolic pathways 10 years ago suggests that l-glucose exists naturally. Most carbohydrates exist as glycosides rather than monosaccharides; therefore, we expected that nature also contains l-glucosides. Sequence analysis within glycoside hydrolase family 29 led us to identify two α-l-glucosidases, ClAgl29A and ClAgl29B, derived from Cecembia lonarensis LW9. ClAgl29A and ClAgl29B exhibited higher K m , k cat , and k cat / K m values for p -nitrophenyl α-l-glucoside than that for p -nitrophenyl α-l-fucoside. Structural analysis of ClAgl29B in complex with l-glucose showed that these enzymes have an active-site pocket that preferentially binds α-l-glucoside, but excludes α-l-fucoside. These results suggest that ClAgl29A and ClAgl29B evolved to hydrolyze α-l-glucoside, implying the existence of α-l-glucoside in nature. Furthermore, α-l-glucosidic linkages (α-l-Glc-(1 → 3)-l-Glc, α-l-Glc-(1 → 2)-l-Glc, and α-l-Glc-(1 → 6)-l-Glc) were synthesized by the transglucosylation activity of ClAgl29A and ClAgl29B. We believe that this study will lead to new research on α-l-glucosides, including determining the physiological effects on humans, and the discovery of novel α-l-glucoside-related enzymes.
Organizational Affiliation:
Research Faculty of Agriculture, Hokkaido University, Sapporo, Hokkaido 060-8589, Japan.
