DNA‐independent transport of plasmid primase protein between bacteria by the I1 conjugation system

DNA‐independent transport of plasmid primase protein between bacteria by the I1 conjugation system The ColIb‐P9 (IncI1)‐encoded conjugation system supports transfer of the plasmid T‐strand plus hundreds of molecules of the Sog polypeptides determined by the plasmid primase gene. Here, we report that Sog primase is abundantly donated to the recipient cell from cells carrying a non‐transferable ColIb plasmid deleted of the nic site essential for DNA export. Such DNA‐independent secretion of Sog primase is typical of authentic conjugation, both in being blocked when the recipient cell specifies the entry exclusion function of ColIb and in requiring the thin I1 pilus encoded by the ColIb pil system under the mating conditions used. It is proposed that Sog polypeptides form a complex with the ColIb T‐strand during conjugation and aid DNA transport through processive secretion of the proteins into the recipient cell. Functional and genetic relationships between the ColIb conjugation system and other type IV secretion pathways are discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Molecular Microbiology Wiley

DNA‐independent transport of plasmid primase protein between bacteria by the I1 conjugation system

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Publisher
Wiley
Copyright
Blackwell Science Ltd
ISSN
0950-382X
eISSN
1365-2958
DOI
10.1046/j.1365-2958.2000.02164.x
Publisher site
See Article on Publisher Site

Abstract

The ColIb‐P9 (IncI1)‐encoded conjugation system supports transfer of the plasmid T‐strand plus hundreds of molecules of the Sog polypeptides determined by the plasmid primase gene. Here, we report that Sog primase is abundantly donated to the recipient cell from cells carrying a non‐transferable ColIb plasmid deleted of the nic site essential for DNA export. Such DNA‐independent secretion of Sog primase is typical of authentic conjugation, both in being blocked when the recipient cell specifies the entry exclusion function of ColIb and in requiring the thin I1 pilus encoded by the ColIb pil system under the mating conditions used. It is proposed that Sog polypeptides form a complex with the ColIb T‐strand during conjugation and aid DNA transport through processive secretion of the proteins into the recipient cell. Functional and genetic relationships between the ColIb conjugation system and other type IV secretion pathways are discussed.

Journal

Molecular MicrobiologyWiley

Published: Nov 1, 2000

References

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