6K5G

Structural and catalytic analysis of two diverse uridine phosphorylases in the oomycete Phytophthora capsici

Summary for 6K5G

• Entry DOI: 10.2210/pdb6k5g/pdb
• Descriptor: Uridine phosphorylase, GLYCEROL (3 entities in total)
• Functional Keywords: phytophthora capsici, uridine phosphorylases, uridine, transferase
• Biological source: Phytophthora capsici LT1534
• Total number of polymer chains: 4
• Total formula weight: 133158.41

Authors

Yang, C.C.,Zhang, X.G. (deposition date: 2019-05-28, release date: 2019-06-12, Last modification date: 2024-03-27)

Primary citation

Yang, C.,Li, J.,Huang, Z.,Zhang, X.,Gao, X.,Zhu, C.,Morris, P.F.,Zhang, X.
Structural and catalytic analysis of two diverse uridine phosphorylases in Phytophthora capsici.
Sci Rep, 10:9051-9051, 2020

PubMed Abstract: Uridine phosphorylase (UP) is a key enzyme of pyrimidine salvage pathways that enables the recycling of endogenous or exogenous-supplied pyrimidines and plays an important intracellular metabolic role. Here, we biochemically and structurally characterized two evolutionarily divergent uridine phosphorylases, PcUP1 and PcUP2 from the oomycete pathogen Phytophthora capsici. Our analysis of other oomycete genomes revealed that both uridine phosphorylases are present in Phytophthora and Pythium genomes, but only UP2 is seen in Saprolegnia spp. which are basal members of the oomycetes. Moreover, uridine phosphorylases are not found in obligate oomycete pathogens such as Hyaloperonospora arabidopsidis and Albugo spp. PcUP1 and PcUP2 are upregulated 300 and 500 fold respectively, within 90 min after infection of pepper leaves. The crystal structures of PcUP1 in ligand-free and in complex with uracil/ribose-1-phosphate, 2'-deoxyuridine/phosphate and thymidine/phosphate were analyzed. Crystal structure of this uridine phosphorylase showed strict conservation of key residues in the binding pocket. Structure analysis of PcUP1 with bound ligands, and site-directed mutagenesis of key residues provide additional support for the "push-pull" model of catalysis. Our study highlights the importance of pyrimidine salvage during the earliest stages of infection.

PubMed: 32493959
DOI: 10.1038/s41598-020-65935-9

Experimental method

X-RAY DIFFRACTION (1.574 Å)