Download MendeleyStructural analysis of the tetrahydrobiopterin glucosyltransferase PsBGluT from Pseudanabaena sp. Chao 1811.
Zang, R., Jiang, Y., Zhou, C.Z.(2025) Acta Crystallogr F Struct Biol Commun 81: 495-504
- PubMed: 41231237
- DOI: https://doi.org/10.1107/S2053230X25009446
- Primary Citation of Related Structures:
9V0L, 9V0W - PubMed Abstract:
Pterin glycosides are widely distributed in cyanobacteria and have been implicated in the regulation of phototaxis and photosynthesis. Here, we identified a new uridine diphosphate glucose:tetrahydrobiopterin α-glucosyltransferase, termed PsBGluT, from Pseudanabaena sp. Chao 1811, which catalyzes the formation of pterin glycosides. We solved crystal structures of apo PsBGluT and its UDP-bound form at 2.8 and 2.3 Å resolution, respectively. PsBGluT forms a homodimer, with each subunit adopting a canonical GT-B fold composed of two Rossmann-like domains. Structural analysis combined with molecular docking revealed the binding sites for both the donor UDP-glucose and the acceptor tetrahydrobiopterin. Based on these findings, we proposed that PsBGluT operates via an S N i retaining catalytic mechanism. This study advances our understanding of pteridine glycosylation and also provides a structural basis for investigating the photosynthetic signaling pathways in cyanobacteria.
- Division of Life Sciences and Medicine, University of Science and Technology of China, Huang Shan Road, Hefei, Anhui 230026, People's Republic of China.
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