The apo-form of the Vibrio cholerae replicative helicase DnaB is a labile and inactive planar trimer of dimers.

Claire Cargemel, Hélène Walbott, Dominique Durand, Pierre Legrand, Malika Ouldali, Jean-Luc Ferat, Stéphanie Marsin, Sophie Quevillon-Cheruel

FEBS letters 2022 Aug

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To enable chromosomal replication, DNA is unwound by the ATPase molecular motor replicative helicase. The bacterial helicase DnaB is a ring-shaped homo-hexamer whose conformational dynamics are being studied through its different 3D structural states adopted along its functional cycle. Our findings describe a new crystal structure for the apo-DnaB from Vibrio cholerae, forming a planar hexamer with pseudo-symmetry, constituted by a trimer of dimers in which the C-terminal domains delimit a triskelion-shaped hole. This hexamer is labile and inactive. We suggest that it represents an intermediate state allowing the formation of the active NTP-bound hexamer from dimers. © 2022 The Authors. FEBS Letters published by John Wiley & Sons Ltd on behalf of Federation of European Biochemical Societies.

Citation

Claire Cargemel, Hélène Walbott, Dominique Durand, Pierre Legrand, Malika Ouldali, Jean-Luc Ferat, Stéphanie Marsin, Sophie Quevillon-Cheruel. The apo-form of the Vibrio cholerae replicative helicase DnaB is a labile and inactive planar trimer of dimers. FEBS letters. 2022 Aug;596(16):2031-2040