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Volume 150, Issue 11

Role of Cal, the colicin A lysis protein, in two steps of colicin A release and in the interaction with colicin A–porin complexes Free

Abstract

Release of colicin A was studied in cells that differed in expressing the olicin ysis protein (Cal). Pools of released and unreleased colicin A were harvested throughout colicin A induction. The amount of colicin A in each pool varied with the time of induction, allowing the definition of two sequential steps in colicin A release, one of which was dependent on Cal. Each step of colicin A release was differently affected in cells containing Cal mutants in which the N-terminal cysteine residue was substituted by either proline or threonine, preventing them from being acylated and matured. These Cal mutants were only observed in cells, indicating that the DegP protease cleaved the unacylated precursor of Cal. Cal was found in the insoluble fraction of the pools of released and unreleased colicin A together with the hetero-oligomers of colicin A and porins (colicins Au). The biogenesis of colicins Au was studied in temperature-sensitive and strains and found to be Sec-independent, indicating that they are formed by newly synthesized colicin A binding to mature porins already incorporated in the outer membrane. Cal is a lipoprotein similar to VirB7, a constituent of the type IV secretion system. It would interact with colicins Au to constitute the colicin A export machinery.

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Keyword(s): Cal, mature form of the colicin Alysis protein , colicins Au, heat-labile oligomers of colicin A and outer-membrane proteins , KU, killing unit , LE, lytic extract , pCal, unacylated Cal precursor , pCalm, modified Cal precursor , SE, salt extract , SP, ammonium sulfate precipitation and ts, temperature-sensitive
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2004-11-01
2025-01-18
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/content/journal/micro/10.1099/mic.0.27160-0
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Role of Cal, the colicin A lysis protein, in two steps of colicin A release and in the interaction with colicin A–porin complexes
Microbiology 150, 3867 (2004); https://doi.org/10.1099/mic.0.27160-0
/content/journal/micro/10.1099/mic.0.27160-0
/content/journal/micro/10.1099/mic.0.27160-0
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