Structural highlights
FunctionPARD_VIBCH Antitoxin component of a type II toxin-antitoxin (TA) system. Neutralizes the effect of toxin ParE (By similarity). Publication Abstract from PubMedParD2 is the antitoxin component of the parDE2 toxin-antitoxin module from Vibrio cholerae and consists of an ordered DNA-binding domain followed by an intrinsically disordered ParE-neutralizing domain. In the absence of the C-terminal intrinsically disordered protein (IDP) domain, V. cholerae ParD2 (VcParD2) crystallizes as a doughnut-shaped hexadecamer formed by the association of eight dimers. This assembly is stabilized via hydrogen bonds and salt bridges rather than by hydrophobic contacts. In solution, oligomerization of the full-length protein is restricted to a stable, open decamer or dodecamer, which is likely to be a consequence of entropic pressure from the IDP tails. The relative positioning of successive VcParD2 dimers mimics the arrangement of Streptococcus agalactiae CopG dimers on their operator and allows an extended operator to wrap around the VcParD2 oligomer. Entropic pressure controls the oligomerization of the Vibrio cholerae ParD2 antitoxin.,Garcia-Rodriguez G, Girardin Y, Volkov AN, Singh RK, Muruganandam G, Van Dyck J, Sobott F, Versees W, Charlier D, Loris R Acta Crystallogr D Struct Biol. 2021 Jul 1;77(Pt 7):904-920. doi:, 10.1107/S2059798321004873. Epub 2021 Jun 18. PMID:34196617[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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