4o7k

Crystal structure of Oncogenic Suppression Activity Protein - A Plasmid Fertility Inhibition Factor

spinqualitylabelsall models 4o7k, resolution 1.75Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4o7k is a 1 chain structure with sequence from Shigella flexneri. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, IPA, PO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function OSA_SHIFL Suppression of A.tumefaciens oncogenicity. Publication Abstract from PubMed Conjugative plasmids are typically locked in intergenomic and sexual conflicts with co-resident rivals, whose translocation they block using fertility inhibition factors (FINs). We describe here the first crystal structure of an enigmatic FIN Osa deployed by the proteobacterial plasmid pSa. Osa contains a catalytically active version of the ParB/Sulfiredoxin fold with both ATPase and DNase activity, the latter being regulated by an ATP-dependent switch. Using the Agrobacterium tumefaciens VirB/D4 type IV secretion system (T4SS), a relative of the conjugative T4SS, we demonstrate that catalytically active Osa blocks T-DNA transfer into plants. With a partially reconstituted T4SS in vitro, we show that Osa degrades T-DNA in the T-DNA-VirD2 complex before its translocation. Further, we present evidence for conservation and interplay between ATPase and DNase activities throughout the ParB/Sulfiredoxin fold, using other members of the family, namely P1 ParB and RK2 KorB, which have general functional implications across diverse biological contexts. Multiple enzymatic activities of ParB/Srx superfamily mediate sexual conflict among conjugative plasmids.,Maindola P, Raina R, Goyal P, Atmakuri K, Ojha A, Gupta S, Christie PJ, Iyer LM, Aravind L, Arockiasamy A Nat Commun. 2014 Oct 31;5:5322. doi: 10.1038/ncomms6322. PMID:25358815 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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