Cosmid based mutagenesis causes genetic instability in Streptomyces coelicolor, as shown by targeting of the lipoprotein signal peptidase gene

Munnoch, John T., Widdick, David A., Chandra, Govind, Sutcliffe, Iain C., Palmer, Tracy and Hutchings, Matthew I. (2016) Cosmid based mutagenesis causes genetic instability in Streptomyces coelicolor, as shown by targeting of the lipoprotein signal peptidase gene. Scientific Reports, 6. ISSN 2045-2322

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Abstract

Bacterial lipoproteins are extracellular proteins tethered to cell membranes by covalently attached lipids. Deleting the lipoprotein signal peptidase (lsp) gene in Streptomyces coelicolor results in growth and developmental defects that cannot be restored by reintroducing lsp. This led us to hypothesise that lsp is essential and that the lsp mutant we isolated previously had acquired compensatory secondary mutations. Here we report resequencing of the genomes of wild-type M145 and the cis-complemented Δlsp mutant (BJT1004) to map and identify these secondary mutations but we show that they do not increase the efficiency of disrupting lsp and are not lsp suppressors. We provide evidence that they are induced by introducing the cosmid St4A10Δlsp, as part of ReDirect PCR mutagenesis protocol, which transiently duplicates a number of important cell division genes. Disruption of lsp using a suicide vector (which does not result in gene duplication) still results in growth and developmental delays and we conclude that loss of Lsp function results in developmental defects due to the loss of all lipoproteins from the cell membrane. Significantly, our results also indicate the use of cosmid libraries for the genetic manipulation of bacteria can lead to phenotypes not necessarily linked to the gene(s) of interest.

Item Type: Article
Additional Information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Faculty \ School: Faculty of Science > School of Biological Sciences
Depositing User: Pure Connector
Date Deposited: 22 Jun 2016 12:00
Last Modified: 22 Apr 2020 01:31
URI: https://ueaeprints.uea.ac.uk/id/eprint/59459
DOI: 10.1038/srep29495

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