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TitleCryo-EM Structure of a Relaxase Reveals the Molecular Basis of DNA Unwinding during Bacterial Conjugation.
Journal, issue, pagesCell, Vol. 169, Issue 4, Page 708-721.e12, Year 2017
Publish dateMay 4, 2017
AuthorsAravindan Ilangovan / Christopher W M Kay / Sandro Roier / Hassane El Mkami / Enrico Salvadori / Ellen L Zechner / Giulia Zanetti / Gabriel Waksman /
PubMed AbstractRelaxases play essential roles in conjugation, the main process by which bacteria exchange genetic material, notably antibiotic resistance genes. They are bifunctional enzymes containing a trans- ...Relaxases play essential roles in conjugation, the main process by which bacteria exchange genetic material, notably antibiotic resistance genes. They are bifunctional enzymes containing a trans-esterase activity, which is responsible for nicking the DNA strand to be transferred and for covalent attachment to the resulting 5'-phosphate end, and a helicase activity, which is responsible for unwinding the DNA while it is being transported to a recipient cell. Here we show that these two activities are carried out by two conformers that can both load simultaneously on the origin of transfer DNA. We solve the structure of one of these conformers by cryo electron microscopy to near-atomic resolution, elucidating the molecular basis of helicase function by relaxases and revealing insights into the mechanistic events taking place in the cell prior to substrate transport during conjugation.
External linksCell / PubMed:28457609 / PubMed Central
MethodsEM (single particle)
Resolution3.9 Å
Structure data

EMDB-3601, PDB-5n8o:
Cryo EM structure of the conjugative relaxase TraI of the F/R1 plasmid system
Method: EM (single particle) / Resolution: 3.9 Å

Source
  • escherichia coli (E. coli)
KeywordsTRANSFERASE / Relaxase / Cryo EM / Helicase / translocase

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