This entry represents the N-terminal section of the 'Toprim hook' as described in [1], which is localised between the Toprim (Pfam:PF01751) and the insert (Pfam:PF18053) domains [1-3]. The C-terminal section of the hook is included in (Pfam:PF00986). The hook is flexible towards the Toprim domain.

1: A domain insertion in Escherichia coli GyrB adopts a novel fold that plays a critical role in gyrase function. Schoeffler AJ, May AP, Berger JM; Nucleic Acids Res. 2010;38:7830-7844. PMID:20675723

2: Direct control of type IIA topoisomerase activity by a chromosomally encoded regulatory protein. Vos SM, Lyubimov AY, Hershey DM, Schoeffler AJ, Sengupta S, Nagaraja V, Berger JM; Genes Dev. 2014;28:1485-1497. PMID:24990966

3: Cryo-EM structure of the complete E. coli DNA gyrase nucleoprotein complex. Vanden Broeck A, Lotz C, Ortiz J, Lamour V; Nat Commun. 2019;10:4935. PMID:31666516