DNA integrity scanning, DisA, linker region (IPR018906)

Short name: DNA_integrity_scan_DisA_link

Overlapping homologous superfamilies

Domain relationships



The DisA protein is a bacterial checkpoint protein that dimerises into an octameric complex. The protein consists of three distinct domains. the first, N-terminal region, from 1-145 is globular and is represented by IPR003390; the next 146-289 residues is this domain that consists of an elongated bundle of three alpha helices (alpha-6, alpha-10, and alpha-11), one side of which carries an additional three helices (alpha7-9), thus forming a spine like-linker between domains 1 and 3. The C-terminal residues of domain 3 (IPR000445), represent the specific DNA-binding domain. The octameric complex thus has structurally linked nucleotide-binding and DNA-binding HhH domains and the nucleotide-binding domains are bound to a cyclic di-adenosine phosphate such that DisA is a specific di-adenylate cyclase. The di-adenylate cyclase activity is strongly suppressed by binding to branched DNA, but not to duplex or single-stranded DNA, suggesting a role for DisA as a monitor of the presence of stalled replication forks or recombination intermediates via DNA structure-modulated c-di-AMP synthesis [PMID: 18439896].

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.