5ja8

Crystal structure of the HigB2 toxin in complex with Nb2

spinqualitylabelsall models 5ja8, resolution 2.49Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5ja8 is a 8 chain structure with sequence from Lama glama and Vibrio cholerae O1 biovar El Tor str. N16961. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.49Å Ligands: ACT, EDO, EPE, PDO, PO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function HIGB2_VIBCH Toxic component of a toxin-antitoxin (TA) module. Inhibits translation by cleavage of mRNA. Publication Abstract from PubMed Toxin-antitoxin (TA) modules are small operons involved in bacterial stress response and persistence. higBA operons form a family of TA modules with an inverted gene organization and a toxin belonging to the RelE/ParE superfamily. Here, we present the crystal structures of chromosomally encoded Vibrio cholerae antitoxin (VcHigA2), toxin (VcHigB2) and their complex, which show significant differences in structure and mechanisms of function compared to the higBA module from plasmid Rts1, the defining member of the family. The VcHigB2 is more closely related to Escherichia coli RelE both in terms of overall structure and the organization of its active site. VcHigB2 is neutralized by VcHigA2, a modular protein with an N-terminal intrinsically disordered toxin-neutralizing segment followed by a C-terminal helix-turn-helix dimerization and DNA binding domain. VcHigA2 binds VcHigB2 with picomolar affinity, which is mainly a consequence of entropically favorable de-solvation of a large hydrophobic binding interface and enthalpically favorable folding of the N-terminal domain into an alpha-helix followed by a beta-strand. This interaction displaces helix alpha3 of VcHigB2 and at the same time induces a one-residue shift in the register of beta-strand beta3, thereby flipping the catalytically important Arg64 out of the active site. Ribosome-dependent Vibrio cholerae mRNAse HigB2 is regulated by a beta-strand sliding mechanism.,Hadzi S, Garcia-Pino A, Haesaerts S, Jurenas D, Gerdes K, Lah J, Loris R Nucleic Acids Res. 2017 Feb 28. doi: 10.1093/nar/gkx138. PMID:28334932 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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