9r8i

sucrose hydrolase SuxB from Xanthomonas oryzae pv. oryzae

spinqualitylabelsall models 9r8i, resolution 2.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9r8i is a 3 chain structure with sequence from Xanthomonas oryzae pv. oryzae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.4Å Ligands: EDO, K, P6G, PEG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The virulence of Xanthomonas oryzae pv. oryzae, the causal agent of bacterial blight (BB) of rice, critically depends on the activation of SWEET sucrose uniporters of the host. To date, the role of SWEET-released sucrose for virulence remains unclear. We here identified the sux locus of Xoo consisting of a LacI-type repressor (SuxR), an outer membrane TonB-like porin (SuxA), an inner membrane MFS H(+)-symporter (SuxC), and a cytosolic sucrose hydrolase (SuxB). Structural and functional analyses demonstrate that SuxB has exclusive sucrose hydrolase activity. Mutant analyses show that the transporter SuxC and the sucrose hydrolase are necessary for growth of bacteria on sucrose, while SuxA is not essential, likely due to the ability of other porins to transport sucrose across the outer membrane. Consistent with a role of SuxR as a sucrose repressor, transcriptome studies show sucrose-dependent regulation of the suxA/suxB genes. Besides a role of sucrose for reproduction, we found that sucrose promotes motility, extracellular polysaccharides production, biofilm formation, and virulence. Notably, the SuxC sucrose H(+)-symporter and the sucrose hydrolase SuxB were required for full virulence of Xoo on indica and japonica rice varieties. Our findings indicate that pathogen-induced sucrose efflux via SWEETs provides sucrose to Xoo, that Xoo uses the sux gene cluster to acquire and utilize sucrose, and that sucrose promotes bacterial fitness and xylem colonization. A critical role of sux cistron-mediated sucrose uptake for virulence of the rice blight pathogen Xanthomonas oryzae pv. oryzae.,Zollner NR, Long J, Song C, Sharkey J, Wudick MM, Loo EPI, Sadoine M, Applegate V, Hoppner A, Smits SHJ, Yang B, Frommer WB PNAS Nexus. 2026 Jan 8;5(1):pgaf412. doi: 10.1093/pnasnexus/pgaf412. eCollection , 2026 Jan. PMID:41536522 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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