Traore, DAK, Torres, VVL, Akhtar, N, Gummer, AM, Flanigan, SF, Coulibaly, F, Adams, V, Whisstock, JC and Rood, JI (2023) TcpA from the Clostridium perfringens plasmid pCW3 is more closely related to the DNA translocase FtsK than to coupling proteins. Structure. ISSN 0969-2126

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Conjugative DNA transfer is a major factor in the dissemination of antibiotic resistance and virulence genes. In the Gram-positive pathogen Clostridium perfringens, the majority of conjugative plasmids share the conserved tcp locus that governs the assembly of the transfer system. Here, we describe multiple structures of the coupling protein TcpA, an essential ATPase that is suggested to provide the mechanical force to propel the DNA through the transfer apparatus. The structures of TcpA in the presence and absence of nucleotides revealed conformational rearrangements and highlight a crucial role for the unstructured C terminus. Our findings reveal that TcpA shares most structural similarity with the FtsK DNA translocase, a central component of the bacterial cell division machinery. Our structural data suggest that conjugation in C. perfringens may have evolved from the bacterial chromosome segregation system and, accordingly, suggest the possibility that double-stranded DNA is transferred through the Tcp conjugation apparatus.

Item Type: Article
Uncontrolled Keywords: conjugation; coupling protein; ATPase; Clostridium perfringens; FtsK; TcpA; pCW3; translocase
Subjects: Q Science > QH Natural history
Divisions: Faculty of Natural Sciences > School of Life Sciences
Depositing User: Symplectic
Date Deposited: 28 Mar 2023 08:14
Last Modified: 28 Mar 2023 08:14

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